Measuring technique and mathematical analysis of conical worms

Attrition and resharpening of tools, limited accuracy of machine setting, etc. can cause deformation and shape errors of the surfaces. A measuring method has been carried out in the recent years that is the measuring of helical surface without rotary table for conical worms. The use of this method makes it possible to explore the errors arising during production (e.g. thread pitch in axial plane, error of profile shape in axis or any illustrious planes, etc.) and to determine the values of these errors. We have worked out a mathematical model of the generatrix spiroid worm, which is used during the evaluation of the measuring results.