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Old October 12th 18, 12:03 AM posted to rec.bicycles.tech
Frank Krygowski[_4_]
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Posts: 10,538
Default "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
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