Bolt torque discussion

nm9stheham said

Thanks very much for sharing all that KK... fascinating. (Well, sorta.... LOL) Question: How did the torques 'fail' when using the oil vs mfr supplied wax and how was that detected? Too many fractional turns to get to a torque or ??? Or did the multiple end up with a twisting force on it? Just curious.

Click to expand...

We used torque and angle to measure the clamp load... If we tried other oils, they would most likely fail in the multiple for angle...

We set a torque spec that we start measuring angle at, let's say 40 ft * lbs, so at 40 ft *lb the angle is now "set" to zero and we measure from there.. We would typically see angle run in the range of about 70° - 90° and we set a range that angle would be for the final torque... With "foreign oil" the angle readings would be higher and outside our angle range that was programmed in the machine...