Numerical-controlled machine tool

A numerical-controlled machine tool control system for cutting a gear, using a gear hobbing machine, gear grinding machine or the like based on a received gear command including a number of teeth to be cut and a tooth profile, said tool comprising:

• a synchronization control pulse distributor for controlling a synchronous relationship between rotation of a cutter and rotation of a gear blank which is determined by the cutter and rotation of a gear blank which is determined by the number of teeth of a gear to be cut based on the gear command;
• a tooth profile forming pulse distributor for controlling at least a vertically-moving shaft of the cutter or the gear blank and a rotary shaft of the gear blank for forming the tooth profile of the gear to be cut which is determined by the tooth profile from the gear command;
• and
• an adder for adding together distribution pulses from said tooth profile forming pulse distributor and said synchronization control pulse distributor to produce command pulses for application to the rotary shaft of the gear blank.