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Tool Talk Discussion Forum

Calibrating a torque wrench

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John *.?-!.* cu

10-21-2004 06:15:21




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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 homowner with no exreavagant equipment to test one? The Proto is in inch/pounds and I know I have to divide by 12 to get foot/pounds.

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Big Jim

10-22-2004 03:11:02




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
Almost any good tool dealer will have contact with someone who can calibrate torque wrenches. I would strongly suspect that it's the clicker one that is off. Beam wrenches are slow and cumbersome but, unless they've been overloaded, don't go out of calibration very often. If you are doing things that need to be torqued, it is worth the cost to have a wrench you can trust.



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Slowpoke

10-22-2004 01:54:15




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
Place an 8 point socket between a beam type wrench and a click type wrench. Set the click wrench to any desired amount. Hold the wrenches in a "V" and with the beam scale facing you, squeeze together. When the beam wrench pointer reaches the click wrench setting, the click wrench should click. The method can be use with any size wrenches. Wrenches are most accurate at center scale.
Works for me.

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the tractor vet

10-21-2004 15:54:44




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
I send mine in with the snap on guy every three years to redone as i know of know way with out a test stand to insure if it is correct and i can not afford to be wrong as my boss did with his his was way off and the end resualts were a blowed engine .he did not know that it was off till i was helping him build a new one and i was torqing down the rockerboxes and i asked him what he had the wrench set at and he told me 85 ft.lbs so i went and got mine out of my truck and at 85 ft.lbs it put 3/4 of a turn more on so we had to back thru the whole engine and redo as his was way off.

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Bus Driver

10-21-2004 15:09:22




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
If the beam type has a logo similar to the Chevy bowtie, it is made by PA Sturdevant. Sears sold them for several years. The beam will fatigue and the wrench should be used only for the final torquing.



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Lou

10-21-2004 11:04:11




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
To check your torque wrench is fairly easy. Clamp the square drive in vise, measure from the center of the square drive to the center of the handle, hang a known weight off the handle at the center, a fifty pound sack of feed allow 1 pound for the sack and a little tiewire total weight 51 pounds, if the handle is 18 inches or 1 1/2 ft 1.5 x 51 = 76.5 ft/lbs.
For ft/lbs, lenght in feet times weight equals ft/lbs.

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Charles (in GA)

10-21-2004 07:08:27




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
We have lots of Proto click type at work, our calibrating shop stays busy with them. If the beam type has not been abused and is straight, it probably is still reasonably accurate. I would send the wrench to Proto. The Protos have some adjustment in them, but if the calibrater has to adjust very much they have to change the parts inside for different parts (machined slightly different) to get it back in the adjustable range. This is a pecularity of the Proto torque wrenches. Our company is slowly switching to Steurvant-Richmont torque wrenches, a much better one.

Charles

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Jim@concordfarms.

10-21-2004 06:47:13




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 Re: Calibrating a torque wrench in reply to John *.?-!.* cub owner, 10-21-2004 06:15:21  
There's a place in Indianapolis that repairs and calibrates torque wrenches and precision tools for me. I expect most major cities would have a service like that. Look in the yellow pages or ask someone at a local machine shop. I don't know of any way for a homeowner to do it without buying something very expensive from snap-on. I found out once that torque wrenches aren't designed to be used at more than 75 percent of their capacity. I used a 250 ft. lb. torque wrench on some 404 JD main caps that were supposed to be torqued to 250. That cost me a new torque wrench! Jim.

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