Drive controller for machine tool

A drive control apparatus for a machine tool for machining a workpiece into a desirable form by rotating said workpiece about a predetermined axis and moving at least one of said workpiece and a tool for machining said workpiece;

• said apparatus comprising:
• reference timing signal generating means for generating a reference timing signal at each predetermined rotational angle in said predetermined axis;
• reference timing signal count means for counting the number of occurrences of said reference timing signal;
• position data storage means for storing position data respectively set so as to correspond to a plurality of different count values of said number of occurrences, said position data indicating a mobile position of at least one of said workpiece and tool;
• moving speed characteristic storage means for storing a moving speed characteristic of at least one of said workpiece and tool between two points in said position data;
• and
• mobile position defining means for reading out, each time the number of occurrences of said reference timing signal counted by said reference timing signal count means reaches said count value, position data corresponding to said reached count data and a next count data to reach from said position data storage means, and a moving speed characteristic corresponding to a part between said reached count value and said next count value to reach from said moving speed characteristic storage means, dividing said part between said reached count value and said next count value to reach into predetermined timings, and defining a mobile position of at least one of said workpiece and tool at each of said divided timings according to said read-out position data and moving speed characteristic;
• wherein at least one of said workpiece and tool is moved according to said mobile position defined by said mobile position defining means.