Modernization of Universal Lathes and Numerically Controlled Lathes for Cutting Screw Surfaces of Progressive Pitch

摘要

At present, there is a need for screw surfaces with smoothly increasing pitch. For example, in the manufacture of screw conveyers for extruders used in plastics production, the plastic must be continuously thickened. In the present work, we propose the modernization of universal lathes and numerically controlled lathes. First, we consider the modernization of a universal lathe (Fig. 1), on the basis of constant continuous increase in pitch.