The helix angle could be the angle in between the thread’s helical path along with a line perpendicular into the screw's axis of rotation. Normally, a lead screw with a larger helix angle displays lowered frictional losses and therefore bigger effectiveness. This metric is usually included in the manufacturer's requirements. https://beckettscjpv.thekatyblog.com/28635825/helping-the-others-realize-the-advantages-of-lead-screw-thread