Posted by TheOldHokie on October 03, 2012 at 07:27:23 from (108.8.11.239):
In Reply to: 450 ft pounds!!! posted by ShadetreeRet on October 02, 2012 at 06:56:42:
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No my friend - this is basic physics pure and simple. Torque is torque - friction has nothing to do with it. A 150# man on the end of a 3' bar produces exactly 450 lb-ft of torque. Jumping on the bar simply produces more than 450 lb-ft of torque becasue you are using gravity to "increase" your static weight (force) with an acceleration force.
Friction enters the picture when we try to use torque as an indirect measure of the clamping force (tension) created in a threaded fastener as we tighten it. That friction varies with the materilas the fasteners are made from and the condition of the threads (oiled, greased. plated. etc). All of those factors are already included by the engineers in the 450 lb-ft specification for tightening that nut. Applying a greater torque simply produces a tension greater than the engineers wanted.
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