Electronic depth controller for EDM apparatus

Details Electronic depth controller for EDM apparatus Electronic depth controller for EDM apparatus

1982-05-06

1985-04-09

Envall, Jr., Roy N.

Electric heating

Metal heating

Cutting or disintegrating

20412925, 2041295, 219 69C, 219 69S, B23P 108, B23P 114

Patent

active

045103658

ABSTRACT:
EDM apparatus has a servo drive under the control of a main control system for advancing a machining electrode toward a conductive workpiece. When the electrode arrives at a surface of the workpiece to commence EDM machining, the main control system causes a sudden deceleration of the servo. The depth controller detects this sudden deceleration by means of a sensor and sets a zero reference plane from which machining depth is measured. The depth controller can also detect electrode breakthrough by detecting servo acceleration occurring when the electrode breaks through a surface of the workpiece.

REFERENCES:
patent: 3435176 (1969-03-01), Lobur
patent: 3694599 (1972-09-01), Davis
patent: 3843864 (1974-10-01), Wohlabaugh
patent: 4039779 (1977-08-01), Rupert
patent: 4049942 (1977-09-01), Balleys et al.
patent: 4185184 (1980-01-01), Pfau
patent: 4188522 (1980-02-01), Baker
patent: 4263494 (1981-04-01), Martin
patent: 4345131 (1982-08-01), Semon et al.
patent: 4361745 (1982-11-01), Rupert et al.
"Micro Computer Controlled Spark Erosion" by Heuvelman et al., Sep. 1980, pp. 24-28.

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