Posted in Mechanical Engineering

Worm Gearing Terminology, Rules and Formulae

 Worm Gearing Terminology (a) Lead. It is the linear distance through which a point on thread moves ahead in one revolution of the worm. For single start thread, lead is equal to the pitch, but for multiple start threads, lead is equal to the product of pitch and number of starts. For multi-start worm, lead = Linear pitch x No. of starts (b) Linear Pitch (LP). It is the distance measured axially (i.e. parallel to the axis of worm) from a point on one thread, to the corresponding point on the adjacent thread on the worm. (c) Helix Angle. It is…