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worm gear

worm gear

worm gear

Hi all,
Please refer to the attached dia. (rough picture)
I have a worm (gear) resting in a housing,having same helixical gear pattern as worm and the housing is fixed. Worm can rotate and move along the axis inside the housing. When only axial force in the worm gear shaft(long shaft) are induced, i just want to find by what axial force the worm starts to rotate in the housing ?
material is steel(worm & housing), friction between steel-steel approx. 0.15, what factors influence the rotation of the worm ?
is it possible to calculate by hand, by what force worm starts to rotate in the housing?

Thanks in advance

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