Torque wrench calibration

lShadowl · #1 11-18-2016, 05:01 AM

Hi group,

Anyone know if my torque wrench needs to be calibrated with a certificate for the MD-RA inspector?

Thanks!

Ron B. · #2 11-18-2016, 09:20 AM

Have not had one ask me for such a thing with at least four builds under my belt using their services.

lShadowl · #3 11-18-2016, 11:16 AM

Quote:

Originally Posted by Ron B.

Have not had one ask me for such a thing with at least four builds under my belt using their services.

Great, thanks a lot Ron!

Bob Kuykendall · #4 11-18-2016, 01:00 PM

Quote:

Originally Posted by lShadowl

Anyone know if my torque wrench needs to be calibrated with a certificate for the MD-RA inspector?

With or without the 0.8 correction factor?

lShadowl · #5 11-18-2016, 03:28 PM

Quote:

Originally Posted by Bob Kuykendall

With or without the 0.8 correction factor?

Sorry for my misknowledge, but what exactly is the 0.8 correction factor?

vluvelin · #6 11-18-2016, 05:43 PM

If you have forgotten atlist 1 time to unscrew the handle beyond ajustment and put it for storage dont use it until you check it !!!!!

You can use other known good one to check yours. If you have no one to check I alm in lachute

BobTurner · #7 11-18-2016, 06:13 PM

It's very easy to check the calibration. Put the square drive piece that goes into a socket in a vice. Rotate the handle until it's horizontal, to the right. Slowly add weights on top of the handle until it clicks. Torque applied will be the weight times the distance from the handle (where the weights were) to the center of the square drive piece. Compare to the torque setting.

Hornet2008 · #8 11-18-2016, 07:51 PM

I do the same in a vice but hang a light bucket mid-handle and add litres of water. A litre of water has a weight of 1 kilogram. Kilograms multiplied by metres gives Newton metres. They also line up with foot pounds.

lShadowl · #9 11-22-2016, 05:02 AM

Thanks to all, I will try to check it myself.

But I still might go check you vluvelin in Lachute !

blueflyer · #10 11-22-2016, 05:05 AM

what a great tip. Basic calculations that I never thought about applying in the shop.

Quote:

Originally Posted by BobTurner

It's very easy to check the calibration. Put the square drive piece that goes into a socket in a vice. Rotate the handle until it's horizontal, to the right. Slowly add weights on top of the handle until it clicks. Torque applied will be the weight times the distance from the handle (where the weights were) to the center of the square drive piece. Compare to the torque setting.