Originally Posted by mhartzel
My issue with the "torque sticks" is:
They are supposed to bend at a set rating. However, there is nothing, that I see, to keep them from over tightening a bolt/nut.
Just because you use an 85 foot-pound setting doesn't mean the 750 foot-pound impact gun will stop at 85.
I had a "professional" wheel and tire tech replace some tires for me and pounded the lug nuts on with one of these "guaranteeing" that they were right. That came back to haunt him as a few days later I need to check the brakes and broke off 2 studs while trying to remove the wheel.
Torque sticks work good (and we use them), IF you use them correctly and as intended.
You are correct about the 750 pound gun overtorquing. The sticks we use are meant to only be used with a 350-400 ft lb range impact gun.
An air impact gun is also affected by incoming air pressure, which is 90 psi for most 1/2 inch guns to achieve their rated specifications. You also have to take into account air hose length in achieving the 90 psi into the impact gun.
You also do not just keep hammering with the sticks, assuming that the stick will keep the fastener from being overtorqued. You watch the fastener, while applying the torque stick and you will see when it quits turning...so to stop applying the impact gun.
So, to correctly use the torque sticks, you need to have the correct air pressure going to the correct impact gun (for the sticks being used).....and the know how of when to stop the impact gun........and it starts at the top of the management chain. If the boss doesn't know how to do it right, then there's a slim chance the employees do either.