Torque wrench calibration check

[Jure]

Ok,i wound back torque wrench below the minimum rating on the scale,ended up with zero tension on the spring,so i have no idea if something inside the wrench moved from its place (click type wrench). I have no beam style or digital torque adapter to check if its still inside the calibration specs. I know i can use string,weights and some math,but can i do it the other way?

If i take a brand new bolt,screw it in (finger tight),take a sharpie and mark the starting position and torque it to lets say 50 nm with the torque wrench that is calibrated and true. If then i take a sharpie and mark the bolt again (2nd line at 50 nm),and then loosen it again,line up the bolt mark at starting position again and tighten it to 50 nm with the wrench on which i have to verify torque accuracy,and if it clicks at the same line where the calibrated one clicked it means its "ok" right? Can i check it this way?

 

[Pinemarten]

That would probably get you close enough.

 

[Jswain]

Take it all the way apart and see how simple it is inside, then put it back together and quit worrying about it.

Unless you work on NASA, F1, or Boeing

 

[Jure]

Take it all the way apart and see how simple it is inside, then put it back together and quit worrying about it.

Unless you work on NASA, F1, or Boeing

i would guess it will be like 20% off after that journey lol

 

[nafterclifen]

It sounds like you're looking for a zero dollar calibration solution? If so, I can't offer a solution.

But if you're willing to spend about $25, you can buy this scale and calibrate the wrench yourself. And after you're done, you have a scale you can use for other purposes. I once used it to weight tires. Did you know that tires of the same size and model might not always weight the same? It happened to me. Anyways, I digress.

https://www.amazon.com/gp/product/B07BHPDSKR/?tag=atomicindus08-20

NOTE - if you have an older Craftsman wrench like I do with an 11/16" adjustment nut inside the handle, you might not be able to fit a standard socket into the handle. I sacrificed an 11/16" 3/8 socket which had a 15/16" diameter and I ground it down to 7/8" in order to fit.

 

[jayemm]

It is situations like this where it's good to have a deflecting beam type (with the pointer) to check other torque wrenches against. They aren't expensive. They are also handy for checking loosening torque. Try that with a clicker type. Better than F'in around with weights etc.

 

[KnurledNut]

If i take a brand new bolt,screw it in (finger tight),take a sharpie and mark the starting position and torque it to lets say 50 nm with the torque wrench that is calibrated and true. If then i take a sharpie and mark the bolt again (2nd line at 50 nm),and then loosen it again,line up the bolt mark at starting position again and tighten it to 50 nm with the wrench on which i have to verify torque accuracy,and if it clicks at the same line where the calibrated one clicked it means its "ok" right? Can i check it this way?

If you have a calibrated torque wrench available, just mate the two together to check the questionable one. An 8 point or 12 point socket will mate to the square. Or use a hex bit socket in one and a regular socket in the other.

 

[ronkz650]

Get a torque adapter if possible. A better solution than a scale or fumbling with two wrenches in my opinion. Here in the USA they are not expensive or hard to get, may be a different story in Europe though.