Re: [CAD_CAM_EDM_DRO] Re: Re edm software/ use hardware

Marcus,
good thoughts, I think such software is not so difficult by itself. But it
needs to
be surounded by the CNC software. This software merely knows the current Gcode
and posn, and can reconstruct a cmd to retrace, do whatever and to
un-retrace. I wrote
wire reverse path software ( skim passes ) years ago. Not very tricky. But
this code has
to fit inside a suitable framework that allows such replacement. The EMC
hasnt been
documented yet so we're all in the dark ( I hope I'm wrong but I never see
function
docs or organization listed in this group ). Anyways, it can be worked into the
NMI system somehow , I just cant untangle the code.
And Sinking EDM, well, what was described is good for Hole and SIngle
axis Sink
EDM> but not for 3D Sink. It's another case again. There you dont retract along
a single vector, nor along a path, but 'away from stock' which is 3D (after
the 1st pass).
This gets the process in a safe place faster than path reversal. It's like
a boring
bar collapsing it's radius while it pulls to top bore center, all at the
same time.
And the other little bits: the return to stock would have to be 'shy' by
a safe amount.
(proportional to 'overburn') and there would be as you mentioned different
velocities.
There's also a suction problem, I've seen large dies pulled of the work
table (hundreds
of pounds ) due to escape velocities. And Many have learned that small
precision parts on
magnets will move, even if 'blocked up'.
regards
TomP


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