Interrupted Generating Profile Error on the Variable Lead Screw.

Abstract

In case of finishing a variable lead screw, the grinding wheel contacts with the screw surface at one point. When the wheel generates the screw surface, and the contact point moves on the screw surface, the contact point forms a locus on the surface. Between the contact point locus and the next one, the generating profile error is established. In order to evaluate this generating profile error, this report shows a method for searching of relative mean curvature between the theoretical screw surface and the surface generated by the grinding wheel. The numerical analysis clarifies as follows. At the bottom and the tip of screw surface, the radius of relative mean curvature is small. As getting far away from the common perpendicular of the tool shaft and the screw axis, the radius of curvature increases.