Working area limiting method in machine tool

Abstract

A method for limiting a working area of a CNC machine tool uses a servo controller for transferring a tool which periodically generates an interrupt signal to a main controller and the main controller periodically transmits position data to the servo controller according to an algorithm of a built-in interrupt routine. The algorithm of the interrupt routine comprises the steps of obtaining standstill position data by subtracting an accumulation value of output position data reflecting a predetermined acceleration/deceleration time constant from an accumulation value of target position data for every corresponding interrupt period, when the interrupt signal is input from the servo controller, and adding the subtraction result to current position data, and transmitting predetermined control data after comparing the standstill position data with predetermined boundary position data. Therefore, the working area of the machine tool can be controlled by software so that accurate numerical control can be continuously performed without causing physical impact to the system.

Dependencies are inferred from the claim text.