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US 4,786,778 AGranted
Electrical discharge machining fine finish circuit with symmetrical waveform in both polarities
OwnerKuang-Ta Ho, Randall C. Gillelandinventors
Life of this patent
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Abstract
An EDM machining circuit which is operable at negative polarity and at positive polarity. A push pull circuit is included to provide a symmetrical waveform with either polarity. Switching control of the main switching transistor is provided through a microprocessor.
Claims7
An electrical discharge machining circuit operable with the machining gap at one polarity for roughing operation and at the other polarity for finishing operation, comprising:
- a first swtiching transistor operated to connect machining power power pulses of one polarity to the gap;
- a second main switching transistor connected in push-pull to said first switching transistor and operated to connect machining power pulses of the other polarity to the gap;
- a separate opposite poled transistor connected to each of the main switching transistors and to the gap and operated along therewith, and
- gating means operativley connected to each of the aforesaid transistors for initiating their alternate roughing and finishing operation.
1 more element
Dependencies are inferred from the claim text.