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"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 |
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