"torque wrench" pump/compressor
 

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level
it would stop?

--
underground experts united
http://user.it.uu.se/~embe8573

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level
it would stop?

Most of the gas stations here use an air station that you can set for
your desired pressure and then just plug the hose onto the tire valve
- there is a little clamp to hold it there. When the tire is inflated
to the specified pressure the inflation stops and a bell rings.

Since they aren't manufactured here I had assumed that the rest of the
world had them too.
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On 10/11/2018 1:54 AM, Emanuel Berg wrote:
Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level
it would stop?


WTF? Did I miss your joke?

http://www.pneumaticplus.com/air-regulator/

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

"torque wrench" pump/compressor
 

AMuzi wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of
watching the indicator, automagically at the
right level it would stop?

WTF? Did I miss your joke?

You don't have to be condescending. Instead be
happy you have so advanced technology at your
business! OK, so it is called an air regulator.

Don't forget to answer my still-unanswered
question on "65 PSI". Unless of course you only
want to answer my "joke" questions?

--
underground experts united
http://user.it.uu.se/~embe8573

"torque wrench" pump/compressor
 

On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level
it would stop?

Most of the gas stations here use an air station that you can set for
your desired pressure and then just plug the hose onto the tire valve
- there is a little clamp to hold it there. When the tire is inflated
to the specified pressure the inflation stops and a bell rings.

Since they aren't manufactured here I had assumed that the rest of the
world had them too.

My experience from 50+ years ago says not to rely on those things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the problem was the volume of each pumping stroke. In a large sized car tire, the volume surge with each big stroke would be absorbed and barely raise the pressure. In a low volume bike tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's easy enough to stop pumping when the dial reads the desired temperature.

- Frank Krygowski

"torque wrench" pump/compressor
 

On Thursday, October 11, 2018 at 10:55:07 AM UTC-4, Emanuel Berg wrote:
AMuzi wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of
watching the indicator, automagically at the
right level it would stop?

WTF? Did I miss your joke?

You don't have to be condescending. Instead be
happy you have so advanced technology at your
business! OK, so it is called an air regulator.

Don't forget to answer my still-unanswered
question on "65 PSI". Unless of course you only
want to answer my "joke" questions?

--
underground experts united
http://user.it.uu.se/~embe8573

You need to understand that a lot of your "questions" sound suspiciously like trolling. Why not get a GOOD book on bicycle repair and learn the proper basic terminology and repair methods? Plus, with a good book you'd have the information at hand and not have to wait for replies from here.

BTW, as Frank stated, using a HIGH volume gas station air hose to fill a road-bicycle tire that has a comparatively very low volume will almost guarantee you'll blow your bicycle tire unless you're very quick at attaching and disengaging the hose.

Cheers

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

--
Ted Heise West Lafayette, IN, USA

"torque wrench" pump/compressor
 

Sir Ridesalot wrote:

You need to understand that a lot of your
"questions" sound suspiciously like trolling.
Why not get a GOOD book on bicycle repair and
learn the proper basic terminology and repair
methods? Plus, with a good book you'd have
the information at hand and not have to wait
for replies from here.

I don't "need" or "have" to do anything. I do
exactly what I want. Like now for example, what
I want to do is add you to my KILL file.
But don't worry, there are tons of negativistic
lamers there already to keep you company.

--
underground experts united
http://user.it.uu.se/~embe8573

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 17:53:05 +0000 (UTC),
Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Or lumens, if you want a multiple thread tie.

--
Ted Heise West Lafayette, IN, USA

"torque wrench" pump/compressor
 

On Thursday, October 11, 2018 at 1:55:08 PM UTC-4, Emanuel Berg wrote:
Sir Ridesalot wrote:

You need to understand that a lot of your
"questions" sound suspiciously like trolling.
Why not get a GOOD book on bicycle repair and
learn the proper basic terminology and repair
methods? Plus, with a good book you'd have
the information at hand and not have to wait
for replies from here.

I don't "need" or "have" to do anything. I do
exactly what I want. Like now for example, what
I want to do is add you to my KILL file.
But don't worry, there are tons of negativistic
lamers there already to keep you company.

--
underground experts united
http://user.it.uu.se/~embe8573

That you're trolling is confirmed!

Cheerio

"torque wrench" pump/compressor
 

On 10/11/2018 12:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?


funny. Pressure is mass/area usually. Except on RBT.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

"torque wrench" pump/compressor
 

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

--
- Frank Krygowski

"torque wrench" pump/compressor
 

On Thursday, October 11, 2018 at 8:30:53 PM UTC+1, AMuzi wrote:
On 10/11/2018 12:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?


funny. Pressure is mass/area usually. Except on RBT.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

Nah, Franki-boy is just bragging, implying that he pumps so powerfully that the sudden increase in pressure in the tube raises the temperature of the air noticeably.

It does raise the question of how short, slight racing mechanics manage to push down the handle on road tubes inflated to awesome bars. I notice my SKS Rennkommprrrressorrrr is rated to 16 bars... of which I use two and a bit, never more than 3 bar

Andre Jute
When professional photographers had arms like gorillas

"torque wrench" pump/compressor
 

On Thursday, October 11, 2018 at 5:45:23 PM UTC+1, Sir Ridesalot wrote:
On Thursday, October 11, 2018 at 10:55:07 AM UTC-4, Emanuel Berg wrote:
AMuzi wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of
watching the indicator, automagically at the
right level it would stop?

WTF? Did I miss your joke?

You don't have to be condescending. Instead be
happy you have so advanced technology at your
business! OK, so it is called an air regulator.

Don't forget to answer my still-unanswered
question on "65 PSI". Unless of course you only
want to answer my "joke" questions?

--
underground experts united
http://user.it.uu.se/~embe8573

You need to understand that a lot of your "questions" sound suspiciously like trolling. Why not get a GOOD book on bicycle repair and learn the proper basic terminology and repair methods? Plus, with a good book you'd have the information at hand and not have to wait for replies from here.

BTW, as Frank stated, using a HIGH volume gas station air hose to fill a road-bicycle tire that has a comparatively very low volume will almost guarantee you'll blow your bicycle tire unless you're very quick at attaching and disengaging the hose.

Cheers

Don't be such a pompous dickhead, Ridealot. Not everyone pretends to know everything, unlike you. Not everyone grew up on your street corner, and consequently value questions differently, and ask them differently too. In any event, when there are so many people willing to answer questions on any given subject, people with something else to fill their minds have no need to remember minor techie details when all one has to do is ask and be patient for about five minutes.

Andre Jute
Fed up with mindless hall monitors

"torque wrench" pump/compressor
 

On 10/11/2018 3:30 PM, AMuzi wrote:
On 10/11/2018 12:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Â*Â* Frank Krygowski wrote:
Â* On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb
wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
Â*Â* inflated to the specified pressure the inflation stops and a
Â*Â* bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

Â* My experience from 50+ years ago says not to rely on those
Â* things, although I suppose they may be different now.

Â* Back then I blew a tire off the rim with one. I suspect the
Â* problem was the volume of each pumping stroke. In a large sized
Â* car tire, the volume surge with each big stroke would be
Â* absorbed and barely raise the pressure. In a low volume bike
Â* tire, it caused an explosion. That's my guess anyway.

Â* I usually inflate using a manual floor pump with a gage. It's
Â* easy enough to stop pumping when the dial reads the desired
Â* temperature.

Don't you mean, when the dial reads the desired foot-pounds?


funny. Pressure is mass/area usually. Except on RBT.

No, sorry, it's FORCE per unit area.

https://whatis.techtarget.com/definition/pressure

https://en.wikipedia.org/wiki/Pressure

Mass vs. weight vs. other forces is a big item of confusion for physics
and engineering students. Teachers work hard to correct the confusion.

--
- Frank Krygowski

"torque wrench" pump/compressor
 

On 10/11/2018 6:10 PM, Andre Jute wrote:
On Thursday, October 11, 2018 at 5:45:23 PM UTC+1, Sir Ridesalot wrote:
On Thursday, October 11, 2018 at 10:55:07 AM UTC-4, Emanuel Berg wrote:
AMuzi wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of
watching the indicator, automagically at the
right level it would stop?

WTF? Did I miss your joke?

You don't have to be condescending. Instead be
happy you have so advanced technology at your
business! OK, so it is called an air regulator.

Don't forget to answer my still-unanswered
question on "65 PSI". Unless of course you only
want to answer my "joke" questions?

--
underground experts united
http://user.it.uu.se/~embe8573

You need to understand that a lot of your "questions" sound suspiciously like trolling. Why not get a GOOD book on bicycle repair and learn the proper basic terminology and repair methods? Plus, with a good book you'd have the information at hand and not have to wait for replies from here.

BTW, as Frank stated, using a HIGH volume gas station air hose to fill a road-bicycle tire that has a comparatively very low volume will almost guarantee you'll blow your bicycle tire unless you're very quick at attaching and disengaging the hose.

Cheers

Don't be such a pompous dickhead, Ridealot.

Right! That's Andre's job!

;-)


--
- Frank Krygowski

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 16:55:04 +0200, Emanuel Berg
wrote:

AMuzi wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of
watching the indicator, automagically at the
right level it would stop?

WTF? Did I miss your joke?

You don't have to be condescending. Instead be
happy you have so advanced technology at your
business! OK, so it is called an air regulator.

Don't forget to answer my still-unanswered
question on "65 PSI". Unless of course you only
want to answer my "joke" questions?

The pressure rating on the tire, put there my the manufacturer, is
probably to try to ensure that someone doesn't try to pump the tire up
to an abnormally high pressure at which it might explode, thus
destroying the tire and giving the owner grounds to sue the maker.
"Hey! Your tire exploded and hurt my finger and now you got to give me
a while bunch of money."
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 19:55:06 +0200, Emanuel Berg
wrote:

Sir Ridesalot wrote:

You need to understand that a lot of your
"questions" sound suspiciously like trolling.
Why not get a GOOD book on bicycle repair and
learn the proper basic terminology and repair
methods? Plus, with a good book you'd have
the information at hand and not have to wait
for replies from here.

I don't "need" or "have" to do anything. I do
exactly what I want. Like now for example, what
I want to do is add you to my KILL file.
But don't worry, there are tons of negativistic
lamers there already to keep you company.


Well, I've mentioned that you might research your questions before
asking them and Frank has even given you a list of books that might
enlighten you and now Sir has told you flat out that you do sound like
a troll.

Perhaps it is you that is at fault and not the growing group that
question your intent.
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On 10/11/2018 6:03 PM, Frank Krygowski wrote:
On 10/11/2018 3:30 PM, AMuzi wrote:
On 10/11/2018 12:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
  Frank Krygowski wrote:
 On Thursday, October 11, 2018 at 5:00:33 AM UTC-4,
John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg

wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve,
set
the gizmo to e.g. 35psi, engage it, and instead of
watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that
you can
set for your desired pressure and then just plug the
hose onto
the tire valve
- there is a little clamp to hold it there. When the
tire is
  inflated to the specified pressure the inflation
stops and a
  bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

 My experience from 50+ years ago says not to rely on
those
 things, although I suppose they may be different now.

 Back then I blew a tire off the rim with one. I
suspect the
 problem was the volume of each pumping stroke. In a
large sized
 car tire, the volume surge with each big stroke would be
 absorbed and barely raise the pressure. In a low
volume bike
 tire, it caused an explosion. That's my guess anyway.

 I usually inflate using a manual floor pump with a
gage. It's
 easy enough to stop pumping when the dial reads the
desired
 temperature.

Don't you mean, when the dial reads the desired foot-pounds?


funny. Pressure is mass/area usually. Except on RBT.

No, sorry, it's FORCE per unit area.

https://whatis.techtarget.com/definition/pressure

https://en.wikipedia.org/wiki/Pressure

Mass vs. weight vs. other forces is a big item of confusion
for physics and engineering students. Teachers work hard to
correct the confusion.


Thank you.

As a 10th grade dropout, I understand the limits of an
autodidact education.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

"torque wrench" pump/compressor
 

On Thursday, October 11, 2018 at 4:06:50 PM UTC-7, Frank Krygowski wrote:
On 10/11/2018 6:10 PM, Andre Jute wrote:
On Thursday, October 11, 2018 at 5:45:23 PM UTC+1, Sir Ridesalot wrote:
On Thursday, October 11, 2018 at 10:55:07 AM UTC-4, Emanuel Berg wrote:
AMuzi wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of
watching the indicator, automagically at the
right level it would stop?

WTF? Did I miss your joke?

You don't have to be condescending. Instead be
happy you have so advanced technology at your
business! OK, so it is called an air regulator.

Don't forget to answer my still-unanswered
question on "65 PSI". Unless of course you only
want to answer my "joke" questions?

--
underground experts united
http://user.it.uu.se/~embe8573

You need to understand that a lot of your "questions" sound suspiciously like trolling. Why not get a GOOD book on bicycle repair and learn the proper basic terminology and repair methods? Plus, with a good book you'd have the information at hand and not have to wait for replies from here.

BTW, as Frank stated, using a HIGH volume gas station air hose to fill a road-bicycle tire that has a comparatively very low volume will almost guarantee you'll blow your bicycle tire unless you're very quick at attaching and disengaging the hose.

Cheers

Don't be such a pompous dickhead, Ridealot.

Right! That's Andre's job!

;-)

https://www.youtube.com/watch?v=bcYppAs6ZdI

-- Jay Beattie.

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 09:27:02 -0700 (PDT), Frank Krygowski
wrote:

On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque
wrench" pump or compressor? I.e., you would
screw on the presta valve, set the gizmo to
e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level
it would stop?

Most of the gas stations here use an air station that you can set for
your desired pressure and then just plug the hose onto the tire valve
- there is a little clamp to hold it there. When the tire is inflated
to the specified pressure the inflation stops and a bell rings.

Since they aren't manufactured here I had assumed that the rest of the
world had them too.

My experience from 50+ years ago says not to rely on those things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the problem was the volume of each pumping stroke. In a large sized car tire, the volume surge with each big stroke would be absorbed and barely raise the pressure. In a low volume bike tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's easy enough to stop pumping when the dial reads the desired temperature.

- Frank Krygowski

When I was talking about the gas station automatic tie filler I wasn't
thinking about bicycles. In fact I can't remember ever filling a
bicycle tire at a gas station, just pump them up at home and ride :-)
But you are right, in a bicycle tire a small volume pumped in raises
the pressure substantially.
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 17:53:05 +0000 (UTC), Theodore Heise
wrote:

On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

More likely pounds per square inch, i.e. psi :-)
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 19:03:06 -0400, Frank Krygowski
wrote:

On 10/11/2018 3:30 PM, AMuzi wrote:
On 10/11/2018 12:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
** Frank Krygowski wrote:
* On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb
wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
** inflated to the specified pressure the inflation stops and a
** bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

* My experience from 50+ years ago says not to rely on those
* things, although I suppose they may be different now.

* Back then I blew a tire off the rim with one. I suspect the
* problem was the volume of each pumping stroke. In a large sized
* car tire, the volume surge with each big stroke would be
* absorbed and barely raise the pressure. In a low volume bike
* tire, it caused an explosion. That's my guess anyway.

* I usually inflate using a manual floor pump with a gage. It's
* easy enough to stop pumping when the dial reads the desired
* temperature.

Don't you mean, when the dial reads the desired foot-pounds?


funny. Pressure is mass/area usually. Except on RBT.

No, sorry, it's FORCE per unit area.

https://whatis.techtarget.com/definition/pressure

https://en.wikipedia.org/wiki/Pressure

Mass vs. weight vs. other forces is a big item of confusion for physics
and engineering students. Teachers work hard to correct the confusion.

But if you compress air it gets hotter so temperature should be taken
into consideration :-)

--

Cheers,

John B.

"torque wrench" pump/compressor
 

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?
--

Cheers,

John B.

"torque wrench" pump/compressor
 

John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

"torque wrench" pump/compressor
 

On 10/12/2018 10:18 AM, Radey Shouman wrote:
John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

As I used to explain it to students: Properly speaking, a _force_ is a
push or a pull on an object. Properly speaking, _mass_ is a measure of
the amount of matter in an object. _Weight_ is a particular force, i.e.
the force of gravity on an object.

So in a U.S. grocery if you buy 2.2 pounds of cheese, you're buying the
amount of cheese upon which the earth's gravity exerts a force of two
pounds. It's a roundabout way of specifying the mass you want, but it
works as long as you're just talking cheese, etc.

In a European country, you'd specify you wanted a kilogram of cheese,
which is about 2.2 pounds worth. There, you're directly specifying the
amount of cheese you want.

That makes it sound like the Europeans are much smarter. But they turn
things around and sometimes measure forces in kilograms, or pressure in
kg/cm^2 etc.

Where it makes a difference is in calculations involving force, mass and
acceleration. Or other engineering calculations. If you don't clearly
understand whether you're dealing with force or with mass, you get
answers that are very, very wrong.


When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Exactly! And students who ignored all that got answers that were wrong
by a factor of 32.2.

As I explained it, g_c ("Gee sub C") is just a conversion factor, in the
same way that (12 in / 1 ft) is a conversion factor. If a person
diligently showed units in their computations, it was obvious when it
was needed.

Most conversion factors have no names, and it always seemed weird to me
that they gave that conversion factor a name. Thousands of students got
endlessly confused between the acceleration of gravity
g, which is 32.2 ft/sec^2
and that conversion factor
g_c, which is 32.2 (lbm*ft)/(lbf*sec^2)

Diligent attention to units on ALL quantities straightens out that
confusion. At least, for most students.

And BTW, I found that engineers typically pay attention to units like
that. To my astonishment, some professors teaching basic physics did not.

--
- Frank Krygowski

"torque wrench" pump/compressor
 

John B. Slocomb wrote:

Well, I've mentioned that you might research
your questions before asking them and Frank
has even given you a list of books that might
enlighten you and now Sir has told you flat
out that you do sound like a troll.

You and a bunch of other guys, [insert your
name here] etc, can call me what you want, I'm
unaffected because every day tons of people
express gratefulness for everything I've done
in just a couple of years - with firewood,
carpentry, bikes, organization, gardening, home
improvement, bricklayer, and so on.

However people who ONLY make derogatory remarks
I'll killfile as it doesn't please me to
interact with this kind of person.

And this is my last remark on this topic :) So
if I don't respond to further replies, that
doesn't mean I agree, it means it don't find
this kind of discussion pleasant/productive :)

--
underground experts united
http://user.it.uu.se/~embe8573

"torque wrench" pump/compressor
 

AMuzi wrote:

As a 10th grade dropout, I understand the
limits of an autodidact education.

When was the last time you were wrong about
a bike issue?

I mean a principle matter, not grabbing the 9mm
combination spanner instead of the 10.

PS. Serious question! DS.

--
underground experts united
http://user.it.uu.se/~embe8573

"torque wrench" pump/compressor
 

On Fri, 12 Oct 2018 10:18:06 -0400, Radey Shouman
wrote:

John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Question. "Lb_m * g". how can you meaure 1 lb_m without gravety?
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On Fri, 12 Oct 2018 11:08:06 -0400, Frank Krygowski
wrote:

On 10/12/2018 10:18 AM, Radey Shouman wrote:
John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

As I used to explain it to students: Properly speaking, a _force_ is a
push or a pull on an object. Properly speaking, _mass_ is a measure of
the amount of matter in an object. _Weight_ is a particular force, i.e.
the force of gravity on an object.

So in a U.S. grocery if you buy 2.2 pounds of cheese, you're buying the
amount of cheese upon which the earth's gravity exerts a force of two
pounds. It's a roundabout way of specifying the mass you want, but it
works as long as you're just talking cheese, etc.

In a European country, you'd specify you wanted a kilogram of cheese,
which is about 2.2 pounds worth. There, you're directly specifying the
amount of cheese you want.

I think I must have been out of school for too long. How is 1 kilogram
which equates to approximately2.20462262185 pounds a different
measurement than pounds? Aren't they both a measurement of the effect
of gravity on a certain amount of stuff?


That makes it sound like the Europeans are much smarter. But they turn
things around and sometimes measure forces in kilograms, or pressure in
kg/cm^2 etc.

Where it makes a difference is in calculations involving force, mass and
acceleration. Or other engineering calculations. If you don't clearly
understand whether you're dealing with force or with mass, you get
answers that are very, very wrong.


When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Exactly! And students who ignored all that got answers that were wrong
by a factor of 32.2.

As I explained it, g_c ("Gee sub C") is just a conversion factor, in the
same way that (12 in / 1 ft) is a conversion factor. If a person
diligently showed units in their computations, it was obvious when it
was needed.

Most conversion factors have no names, and it always seemed weird to me
that they gave that conversion factor a name. Thousands of students got
endlessly confused between the acceleration of gravity
g, which is 32.2 ft/sec^2
and that conversion factor
g_c, which is 32.2 (lbm*ft)/(lbf*sec^2)

Diligent attention to units on ALL quantities straightens out that
confusion. At least, for most students.

And BTW, I found that engineers typically pay attention to units like
that. To my astonishment, some professors teaching basic physics did not.
--

Cheers,

John B.

"torque wrench" pump/compressor
 

On 10/12/2018 5:54 PM, John B. Slocomb wrote:
On Fri, 12 Oct 2018 10:18:06 -0400, Radey Shouman
wrote:

John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Question. "Lb_m * g". how can you meaure 1 lb_m without gravety?

In theory, smack it into something at a known velocity in
outer space. Nice weekend project.

Not that metric is any better, in that KPa does not equal Atm:
https://www.chemteam.info/GasLaw/Pre...nversions.html


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

"torque wrench" pump/compressor
 

On 10/12/2018 6:54 PM, John B. Slocomb wrote:
On Fri, 12 Oct 2018 10:18:06 -0400, Radey Shouman
wrote:

John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Question. "Lb_m * g". how can you meaure 1 lb_m without gravety?

Interestingly, they do that! Or rather, they do it in orbit or in free
fall*, which is effectively the same thing.

On the International Space Station, they attach the mass to a spring
system. The frequency of oscillation allows them to determine the mass.

Here you go: https://www.youtube.com/watch?v=8rt3udip7l4

(* Free fall or stable orbit isn't exactly "without gravity" because
gravity is acting on the object. But since the object is accelerating
freely in response to gravity, it's effectively the same as if the
gravitational force were zero.)

--
- Frank Krygowski

"torque wrench" pump/compressor
 

On 10/12/2018 7:01 PM, John B. Slocomb wrote:
On Fri, 12 Oct 2018 11:08:06 -0400, Frank Krygowski
wrote:

On 10/12/2018 10:18 AM, Radey Shouman wrote:
John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

As I used to explain it to students: Properly speaking, a _force_ is a
push or a pull on an object. Properly speaking, _mass_ is a measure of
the amount of matter in an object. _Weight_ is a particular force, i.e.
the force of gravity on an object.

So in a U.S. grocery if you buy 2.2 pounds of cheese, you're buying the
amount of cheese upon which the earth's gravity exerts a force of two
pounds. It's a roundabout way of specifying the mass you want, but it
works as long as you're just talking cheese, etc.

In a European country, you'd specify you wanted a kilogram of cheese,
which is about 2.2 pounds worth. There, you're directly specifying the
amount of cheese you want.

I think I must have been out of school for too long. How is 1 kilogram
which equates to approximately2.20462262185 pounds a different
measurement than pounds? Aren't they both a measurement of the effect
of gravity on a certain amount of stuff?

First, don't trouble yourself. For ordinary everyday stuff it doesn't
matter.

But at its heart, mass is not the same as weight. For a simple example,
if you took a 1 kg mass to the moon its mass would still be 1 kg. But
its weight would be about 1/6 of what it was on earth. And in the ISS
the observed weight or effective weight of that object would be zero.

Again, if you're just (say) buying cheese on the surface of the earth
the difference doesn't matter. If you don't keep it straight in
calculations involving dynamics - as in "how much tension will be on
this connecting rod?" - you're apt to get answers that are off by a
factor of 32. Or in an SI system country, off by a factor of 9.8 or so.


--
- Frank Krygowski

"torque wrench" pump/compressor
 

John B. Slocomb writes:

On Fri, 12 Oct 2018 10:18:06 -0400, Radey Shouman
wrote:

John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Question. "Lb_m * g". how can you meaure 1 lb_m without gravety?

Apply a known force and see how fast it accelerates.

--

"torque wrench" pump/compressor
 

On Fri, 12 Oct 2018 22:16:00 -0400, Frank Krygowski
wrote:

On 10/12/2018 6:54 PM, John B. Slocomb wrote:
On Fri, 12 Oct 2018 10:18:06 -0400, Radey Shouman
wrote:

John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

When I was in school, years ago, we were quite strictly made to write
either lb_f (pound force) or lb_m (pound mass), and to include unit
conversions from one to the other using constants g (the nominal force
of graivty at the surface of the Earth) and g_c (a unit conversion factor).

The conversion is:

lb_f = lb_m * g / g_c

In English units g = 32.2 ft/s^2
g_c = 32.2 lb_m ft/s^2 lb_f

but if you didn't include the conversion, you failed.

Question. "Lb_m * g". how can you meaure 1 lb_m without gravety?

Interestingly, they do that! Or rather, they do it in orbit or in free
fall*, which is effectively the same thing.

On the International Space Station, they attach the mass to a spring
system. The frequency of oscillation allows them to determine the mass.

Here you go: https://www.youtube.com/watch?v=8rt3udip7l4

(* Free fall or stable orbit isn't exactly "without gravity" because
gravity is acting on the object. But since the object is accelerating
freely in response to gravity, it's effectively the same as if the
gravitational force were zero.)

Ah, I understand. So what you are really talking about is an object
falling without any resistance of the air... cause there ain't none
and feathers fall as fast as lumps of lead :-)

--

Cheers,

John B.

"torque wrench" pump/compressor
 

On Fri, 12 Oct 2018 22:21:58 -0400, Frank Krygowski
wrote:

On 10/12/2018 7:01 PM, John B. Slocomb wrote:
On Fri, 12 Oct 2018 11:08:06 -0400, Frank Krygowski
wrote:

On 10/12/2018 10:18 AM, Radey Shouman wrote:
John B. Slocomb writes:

On Thu, 11 Oct 2018 15:36:04 -0400, Frank Krygowski
wrote:

On 10/11/2018 1:53 PM, Theodore Heise wrote:
On Thu, 11 Oct 2018 09:27:02 -0700 (PDT),
Frank Krygowski wrote:
On Thursday, October 11, 2018 at 5:00:33 AM UTC-4, John B. Slocomb wrote:
On Thu, 11 Oct 2018 08:54:38 +0200, Emanuel Berg
wrote:

Just out of curiosity, is there a "torque wrench" pump or
compressor? I.e., you would screw on the presta valve, set
the gizmo to e.g. 35psi, engage it, and instead of watching
the indicator, automagically at the right level it would
stop?

Most of the gas stations here use an air station that you can
set for your desired pressure and then just plug the hose onto
the tire valve
- there is a little clamp to hold it there. When the tire is
inflated to the specified pressure the inflation stops and a
bell rings.

Since they aren't manufactured here I had assumed that the
rest of the world had them too.

My experience from 50+ years ago says not to rely on those
things, although I suppose they may be different now.

Back then I blew a tire off the rim with one. I suspect the
problem was the volume of each pumping stroke. In a large sized
car tire, the volume surge with each big stroke would be
absorbed and barely raise the pressure. In a low volume bike
tire, it caused an explosion. That's my guess anyway.

I usually inflate using a manual floor pump with a gage. It's
easy enough to stop pumping when the dial reads the desired
temperature.

Don't you mean, when the dial reads the desired foot-pounds?

Oh geez, my mistake!

But: Neither! I stop when it reads the desired PRESSURE!

Around here we use psi = pounds per square inch. Weirdly enough, my
pump's pressure gauge is also graduated in kg/cm^2. I would have used
that as a bad example in my courses, since kg is properly used to
measure mass, not force. And pressure is force per unit area.

(This indicates that the SI system gets misused as much as the U.S. or
Imperial system.)

But isn't "pound" a measurement of mass also :-?

As I used to explain it to students: Properly speaking, a _force_ is a
push or a pull on an object. Properly speaking, _mass_ is a measure of
the amount of matter in an object. _Weight_ is a particular force, i.e.
the force of gravity on an object.

So in a U.S. grocery if you buy 2.2 pounds of cheese, you're buying the
amount of cheese upon which the earth's gravity exerts a force of two
pounds. It's a roundabout way of specifying the mass you want, but it
works as long as you're just talking cheese, etc.

In a European country, you'd specify you wanted a kilogram of cheese,
which is about 2.2 pounds worth. There, you're directly specifying the
amount of cheese you want.

I think I must have been out of school for too long. How is 1 kilogram
which equates to approximately2.20462262185 pounds a different
measurement than pounds? Aren't they both a measurement of the effect
of gravity on a certain amount of stuff?

First, don't trouble yourself. For ordinary everyday stuff it doesn't
matter.

But at its heart, mass is not the same as weight. For a simple example,
if you took a 1 kg mass to the moon its mass would still be 1 kg. But
its weight would be about 1/6 of what it was on earth. And in the ISS
the observed weight or effective weight of that object would be zero.

Again, if you're just (say) buying cheese on the surface of the earth
the difference doesn't matter. If you don't keep it straight in
calculations involving dynamics - as in "how much tension will be on
this connecting rod?" - you're apt to get answers that are off by a
factor of 32. Or in an SI system country, off by a factor of 9.8 or so.

O.K. mass would be a factor in the acceleration of an object when a
force is applied to it.

--

Cheers,

John B.