Re: [CAD_CAM_EDM_DRO] Home built CNC EDM

Piotr,
another ( I forgot)
Delta Tau's PMAC controller
I used this first for CNC EDM nearly 7 years ago.
for EDM use the 'wiper' input. Send this input a bipolar value that is
proportionate to the desired GapVoltage. I think it needed +/- 5Vdc.
So, an op amp was given the gap signal, scaled , compared the the desired GV,
the difference was bipolar and drove the feedrate (bipolar) of the PMAC.
Thier hdwr has changed a lot since then, I used a 'PMAC Lite" ISA card.
regards
tomp


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