Electric discharge machining apparatus

Details Electric discharge machining apparatus Electric discharge machining apparatus

1980-09-12

1982-07-13

Shaw, C. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69W, B23P 112

Patent

active

043396500

ABSTRACT:
An electric discharge machining apparatus for cutting and shaping a workpiece into an article having a desired configuration in which the period of time required until the speed of a table carrying the workpiece becomes constant is made quite short. Comparator means compares a gap voltage between a wire-shaped electrode and a workpiece with a reference voltage to produce an error voltage. In one embodiment, a non-linear amplifier is disposed between the output of the comparator means and the input of an integrator. In the integrator, a clamping diode is coupled across an integrating capacitor so as to prevent the output of the integrator from becoming negative.

REFERENCES:
patent: 2223177 (1940-11-01), Jones
patent: 3793502 (1974-02-01), Bell, Jr.
patent: 3989921 (1976-11-01), Ohi et al.

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