Which torque wrench do you use/recommend?

[esshup]

Originally Posted by Gene

esshup - I also have an older Sears Craftsman inch pound torque wrench. It has served me well for about 10 years. But I do not know how to calibrate it. Please explain. Thanks

Funny you should ask. The QC labrat will be swinging by the shop tomorrow to return the calipers they picked up for calibration today. I'll ask!

[esshup]

Here's the process. They have a sensor that is fixed into a block. This is connected to a data acquisition device, which in turn sends the data to a computer. The sensor has adapters to fit 1/4", 3/8" and 1/2" square drives. They put the torque wrench in the adapter, adjust it to the lowest setting and apply torque until it clicks. They do this a few times, move to the middle setting, repeat the process and then move to the highest setting and repeat the process. If the torque wrench is more than "X" percent away from the actual torque that it took to make it click, it is either sent out for repair (back to the mfg.) or scrapped and replaced, depending on the value of the wrench vs. a new price. They couldn't set a number on the percentage, because it will vary depending on the application. But, with some arm twisting, he said within 2% to 3% is what they commonly looked for.

Hope this is what you were looking for.

[Gene]

Well, its not exactly what I need for a do-it-yerself project. But now I know. Guess I will have to rely on what the Sears shows me. Actually, with action and scope screws the important thing is to have torque on both sides consistent. Having it to .001 inch isn't too imnportant.

[Dan Conzo]

Snap-On has an excellent one (1/4 or 3/8" drive) from 30 to 200 in lbs.

Dan