Ultra-fine finish EDM method and apparatus

Details Ultra-fine finish EDM method and apparatus Ultra-fine finish EDM method and apparatus

1980-01-25

1983-05-03

Shaw, C. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69P, 219 69C, B23P 102

Patent

active

043821685

ABSTRACT:
An improved method of and power-supply system for EDM whereby machining pulses of on-time in the order of 10 to 100 nanoseconds are passed through an EDM gap to assure ultra-fine finish EDM results by using the gap current build-up characteristic resulting from each individual machining pulse and thereby timing the termination thereof to compensate for a delay caused by the inherent presence of a stray impedance in the gap power circuit lines. The machining pulses can be in the form of successive, intermittently interrupted trains of elementary pulses of which on-time is defined at a minimum which provides a minimum unit of stock removal by each pulse.

REFERENCES:
patent: 3778579 (1973-12-01), Takarada
patent: 3943321 (1976-03-01), Pfau et al.

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