Apparatus for detecting discharge gap in electric discharge mach

Details Apparatus for detecting discharge gap in electric discharge mach Apparatus for detecting discharge gap in electric discharge mach

1985-01-31

1988-03-01

Leung, Philip H.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, B23H 102

Patent

active

047287640

ABSTRACT:
A discharge gap measuring circuit measures the gap between a machining electrode and a workpiece in an electric discharge machining apparatus which uses a pulsed voltage as input. The circuit includes peak detecting means to measure the peak value of the voltage that develops between the machining electrode and the workpiece. Further, waiting time detecting means measure the time from the beginning of the input electrical pulse to the actual start of the discharge. An adder circuit combines the outputs of the two detecting circuits to produce a voltage representative of the actual gap. The output is used for controlling the position of the workpiece or the electrode to maintain the gap at a constant level so that a uniform workpiece finish and accelerated operation is obtained.

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patent: 4071729 (1978-01-01), Bell, Jr.
patent: 4078163 (1978-03-01), Bell, Jr. et al.

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