Abstract

A numerical controller for a machining center comprising a microprocessor, which selectively executes an automatic programming function and a numerical control function. The microprocessor selectively displays on a CRT display unit various information which instructs an operator to input machining information regarding the blank and finished shapes of a workpiece and the mounting position of the workpiece on a work table. The operator inputs the machining information with a key board-type data input device in response to the information displayed on the CRT screen, and the machining information is stored in a data storage device. Based upon the stored machining information, the microprocessor then displays on the CRT screen the blank shape and the finished shape of the workpiece so that the operator can observe if the machining information has been correctly input. Unless modification of the stored machining information is required, the microprocessor prepares the numerical control (NC) program based upon the stored machining information. The microprocessor, in response to a machining start command, executes the numerical control function and controls the operation of the machining center in accordance with the NC program.