Finding the force acting on the helix of the thread

deepaknatraj · Nov 6, 2015

How do I find the force acting on the helix of a thread.

Say if I'm using a torque wrench to tighten a nut and compress a gasket between nut and a mating piece and give 100 ft.lbs of torque how much of it will be available on the helix of the thread (say a helix angle of 0.67 degrees). Assumption would be no friction.

Can someone help me with this calculation?

Thanks

billy_joule · Nov 6, 2015

Assuming no friction is generally a poor idea for screw threads, nuts don't stay tight without friction.

All textbooks on machine design will cover this, I recommend shigleys mechanical engineering design.

or google 'power screw':
http://www.roymech.co.uk/Useful_Tables/Cams_Springs/Power_Screws_1.html

Finding the force acting on the helix of the thread

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