Method and apparatus for controlling electrode position in an electric discharge machine by counting feedback pulses and repeatedly adding the count
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United States of America Patent
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Jun 23, 1987
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N/A
app pub date -
Jun 23, 1982
filing date -
Jun 25, 1981
priority date (Note) -
Expired
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Abstract
A method and apparatus for controlling an electric discharge machine wherein a motor for establishing relative movement between an energized electrode and a workpiece is driven in accordance to with NC command data. The method includes the steps of converting commanded speed information into a speed command value to control the speed of the motor, counting, by using a counter, pulses generated by a sensor each time the motor rotates by a predetermined amount, reading the value of the count in the counter periodically, adding the read values cumulatively to determine the present position of the electrode, and sending a command to the counter each time its counted value is read, to cancel the counted value.
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