Quote:
Originally Posted by jlex
Also, always turn the scale back to 0 with click type torque wrenches prior to storage to keep them accurate. Tension kept on the spring will throw them off.
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Per the advise of PMEL (Air Force QA lab), I turn my wrenches down to the lowest indicated setting. Puts a slight tension on the spring.
Also, FWIW, I had them check my Harbor Freight Wrenches. They are well within the expected accuracy and repeatability.
Quote:
Originally Posted by HarryD
So... Today I took my 3/8" HF Torque wrench to PMEL to see how bad it really is. When tested, they found the following:
Setting --- Found value
16 ft-lb ... 16.17 ft-lb
48 ft-lb ... 48.83 ft-lb
80 ft-lb ... 81.67 ft-lb
Since +4% ft-lb is the target range, not too shabby. 
We discussed use and storage and the DoD recommends to following for these tools:
Storage: Store with spring set at lowest setting not toally relaxed.
Use: Set to higher value than planned setting for use. Click 6 times. Reset to desired set point.
Anyway, I'm pretty happy for $10.
Also, he has told me that he has checked a number of these HF wrenches and they have all been within accepable values. |