Abstract
This report deals with a control of NC lathe by feedback of workpiece dimension which is measured with the method reported previously by the authors.
The outer surface of a workpiece being machined is continuously monitored to determine its instantaneous size by the measuring apparatus during operation and the tool rest is automatically moved in the direction to eliminate the error. As a consequence, a high dimensional accuracy is obtained by this feedback control for not only the workpiece with constant diameter but also the workpiece with a curved profile. Moreover with this control method, there is no need to perform the conventional complicated calculations in programming to compensate the error caused by the finite cutter radius.
Total errors are suppressed within the range corresponding to ± one feed pulse by this control.
