[Farmall] calibrating torque wrench

[szabelsk at gdls.com]

Calibration needs to be done by somebody who has the correct equipment.  I
know some people try to calibrate by tightening a bolt with a known good
wrench, and then try to calibrate by loosening with the wrench they are
trying to calibrate. This doesn't work since the torque to loosen a bolt is
different then the torque to tighten a bolt. Also keep in mind that
different torque wrenches have different accuracies. Getting two different
reading with two different torque wrenches doesn't mean either one is good
or bad, it's a matter of being within the tolerance range for the wrench.
You could be on the high end of tolerance for one wrench, and on the low
end for the other. Sometimes the accuracy changes with the torque range.

Testing by snapping bolts also won't work, since the listed breaking
strengths of bolts are average numbers, and the actual breaking strengths
of a batch of bolts can vary greatly.

I have no idea what somebody would charge to calibrate a torque wrench, but
if you decide to do one, you may want to consider doing both.

Carl Szabelski



|---------+----------------------------------------->
|         |           "E. John Puckett"             |
|         |           <ejpuckett at centurytel.net>    |
|         |           Sent by:                      |
|         |           farmall-bounces at lists.antique-|
|         |           tractor.com                   |
|         |                                         |
|         |                                         |
|         |           10/21/2004 09:18 AM           |
|         |           Please respond to Farmall/IHC |
|         |           mailing list                  |
|         |                                         |
|---------+----------------------------------------->
  >---------------------------------------------------------------------------------------------------------------|
  |                                                                                                               |
  |       To:       Farmall/IHC mailing list <farmall at lists.antique-tractor.com>                                  |
  |       cc:                                                                                                     |
  |       Subject:  [Farmall] calibrating torque wrench                                                           |
  >---------------------------------------------------------------------------------------------------------------|




I have 2 torque wrenches, a 20 or 25 year old no name beam type, and a 5 or
6
year old Proto micrometer (6066A) that give drastically different readings.

Both have been well cared for, with minimal use.  My problem is they give
drastically different readings.  The bad part is I suspect the Proto is the

inaccurate one.  does anyone have a way for an average homeowner with no
extravagant equipment to test one?  The Proto is in inch/pounds and I know
I
have to divide by 12 to get foot/pounds.
--
John
another one of them
*.?-!.* cub owners
_______________________________________________
Farmall mailing list
http://www.antique-tractor.com/mailman/listinfo/farmall