APPARATUS FOR ELECTRIC DISCHARGE MACHINING.

摘要

An apparatus for wire electric discharge machining or an apparatus for electric discharge machining for engraving, the machining time of which can be controlled reliably. The apparatus has means (1) for determining actual machining condition including the machining speed in accordance with machining condition basic data (8) obtained experimentally in advance, and set data (7) inputted by the operator, means (2) for calculating the circumferential length L of a workpiece by use of a machining program (9), means (3) for calculating machining time in accordance with the machining speed included in the actual machining condition and the circumferential length L, means (4) for calculating the machining end time (t+T) from the present time t measured by clock means (14a) and the machining time T, display means (16) display the present time t on an analogue clock (63), and the machining end time (t+T) on an analogue clock (64). Since the present time and the machining end time are thus displayed on analogue clocks, the operator can recognize such information easily just by observing the screen, thus making it possible to easily control the machining time exactly.