Servo system and method for controlling the gap spacing between

Details Servo system and method for controlling the gap spacing between Servo system and method for controlling the gap spacing between

1980-06-24

1982-03-23

Dobeck, B.

Electric heating

Metal heating

Cutting or disintegrating

318603, 219 69C, B23P 112

Patent

active

043214517

ABSTRACT:
An improved servo system and method in an EDM machine for controlling the relative electrode displacement or the gap spacing between a tool electrode and a workpiece, wherein the electrodes are brought to a machining position to permit a succession of electrical discharges to be developed therebetween across the machining gap. A counter is used to count the number of machining pulses and, when the number reaches a value preset in conjunction with the machining area defined by the confronting electrodes, to provide an "advance" or "advance-enabling" signal. Only upon development of this signal or concurrent development of it and a usual servo "advance" signal from a gap sensor/servo signal generator responsive to a gap variable, e.g. gap voltage, a servo drive circuit acting on a motor or actuator for driving the movable electrode is actuated to allow the electrode to be advanced or stepped forward to a next machining position. The preset level of the discharge counter is varied from one value to another in response to a change in the machining area, setting or gap condition during the course of the machining operation.

REFERENCES:
patent: 4039779 (1977-08-01), Ruppert
patent: 4057703 (1977-11-01), Pfau
patent: 4071729 (1978-01-01), Bell, Jr.
patent: 4150275 (1979-04-01), Wavre
patent: 4185184 (1980-01-01), Pfau

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