Calibrating a torque wrench

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buck91

buck91

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I have a Proto 6061-5 torque wrench which I have determined to be 8% off using the lever distance and 1 gallon of water as a weight method. Shopping around the best price I have found is $50 to calibrate this wrench, but being the cheap SOB I am I would like to try my hand at it (was an ebay steal to begin with so...).

Has anybody calibrated a Proto before? The company wont give me any assistance and I'm not sure if the big black hex on the handle needs to be removed to access the adjustment or IS the adjustment?
 
My concern is that you would want to calibrate it at the whole range of settings. Can you do this practically?
 
Perform a search and you should find some info. On a lot of clicker wrenches the adjustment is just one nut.
 
Well, I figure I can just hang the water at different measured length to apply great or less torque. Hadn't had luck searching on this before but today on the above suggestion I tried again and found this site which shows a nice break down of a similar constructed wrench...
 
Other than not knowing how to do the job and not having a torque calibrator, sounds like you're good to go!
 
I also agree that I'm skeptical how accurate you can get it or if you've even accurately measured how far off it is now. If you're not very exacting and sure if what you're doing, you might be overstating your 8% error.

How careful have you been to know the exact mass of your weight?

I know it's not rocket science, but unless you're sure of your weight you're using and the other details, I wouldn't personally tinker with it.

For my needs of checking my torque wrenches I have a digital torque adapter. I would also use it for adjusting mine, but all mine are still in spec, so I don't need to.
 
Getting back, unless you are designing a rocket to go to Mars, you should be fine with 8% inaccuracy.
 
Originally Posted By: buck91
Well, I figure I can just hang the water at different measured length to apply great or less torque. Hadn't had luck searching on this before but today on the above suggestion I tried again and found this site which shows a nice break down of a similar constructed wrench...


Calibration labs buy torque calibrators because they can't find a bucket and a ruler.
 
Originally Posted By: redbone3
Originally Posted By: buck91
Well, I figure I can just hang the water at different measured length to apply great or less torque. Hadn't had luck searching on this before but today on the above suggestion I tried again and found this site which shows a nice break down of a similar constructed wrench...


Calibration labs buy torque calibrators because they can't find a bucket and a ruler.


Thanks pal i will remember you for making me spit my coffee all over the monitor.
lol.gif

JK
 
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