CUTTING APPARATUS FOR A NONCIRCULAR CROSS SECTION

摘要

In a machine tool for cutting a non-circular cross section on a workpiece, sensing means are provided to detect the rotational angle of the main shaft which rotates the workpiece and the signals thus obtained are used to control the longitudinal displacement of a non-rotary tool shaft disposed perpendicularly to the main shaft and which can advance and retreat axially relatively to the main shaft axis but cannot be rotated. An armature on the tool shaft lies between a pair of electromagnets that are energized in accordance with the signals indicating the rotational angle of the main shaft and thereby the tool shaft is displaced longitudinally accordingly. The axial position and the speed of longitudinal displacement of the tool shaft are also sensed to obtain feedback for stabilizing the travel and positioning of the tool.