Method for controlling an electro-discharge machine tool

Details Method for controlling an electro-discharge machine tool Method for controlling an electro-discharge machine tool

1977-04-06

1979-03-27

Reynolds, Bruce A.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, B23P 108

Patent

active

041467701

ABSTRACT:
The spark rate across electro-discharge machine tool electrodes and workpiece, is counted and compared with a given pulse output from a reference source. A constant ratio of spark pulses to reference pulses indicates a stable machining operation. Variation in the ratio indicates breakthrough of the electrode, into e.g. a passage in the workpiece. A signal is derived from the ratio variation and is utilized to operate a switch to cut off power to the electrode. The invention is particularly useful where a bank of electrodes machine a row of holes into a passage, for it may be that some electrodes break through before others, making it possible for them to machine the back wall of the passage if power is not cut off.

REFERENCES:
patent: 3816692 (1974-06-01), Ratmansky
patent: 3864541 (1975-02-01), Inoue
patent: 3995134 (1976-11-01), Dudden

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