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US 4,733,043 AGranted
Ram stabilizing circuit for electrical discharge machine
AssigneeColt Industries Inc.
InventorOliver A. Bell, Jr.
Life of this patent
Estimating the term…
Abstract
A closed loop servo feed system for an EDM ram. A gap voltage signal is processed to control the servo feed operation with respect to ram velocity and also ram direction. A first network is provided with a voltage to frequency section for controlling ram velocity. A second network includes a raise/lower ram section with a comparator to determine the direction of ram movement.
Claims8
A servo feed system for an electrical discharge machining apparatus for machining an electrically conductive workpiece by an electrode carrying ram across a dielectric filled gap, comprising:
- an electrical servo feed motor operatively connected to said ram;
- means connected to the gap for providing a gap voltage signal;
- a first network connected to said signal for generating a first clock signal representative of ram velocity;
- a second network connected to said signal for generating a second clock signal phase displaced from said first clock signal and representative of ram direction of movement;
- and
- means for combining said signals to provide a control output for said servo feed motor.
3 more elements
Dependencies are inferred from the claim text.