> Hi all,
Pete just sent me this:
"
Here is a short description of my EDM software:
The software is written in Basic; I run it under linux in single-user mode.
It issues step and direction signals via parport data pins 1-8 for 1 to 4 axis
motion along a pre-programmed path. That motion is entirely controlled by
signals received from a [erosion gap] voltage comparator that announces via
status pins 13 & 15 whether the electrode is too close or too far from the
surface being eroded. If too_close = false AND too_far = false, then the
electrode sits motionless eroding away the workpiece. If too_close = true,
then it checks twice more and if still true, then it backs out. Back-outs
occur along the programmed path or toward pre-programmed escape points. They
occur at timed intervals or as a function of the too_close flag becoming true.
If the fault does not clear the program will back up all the way to the first
point in the file. The usual jog, axis reset and other functions are included.
Attached are two pictues of combined axis work. I'll leave it to you to
drill down the pix if you think there is a reason to send them to anybody.
The first is threading a hole in a file, using Z & C axes. The second is
"rolling" a die over an electrode that was milled flat, using X & C axes. In
the latter case, backing out for flushing was done in the +Y direction, Not by
rolling the die back across the face of the electrode. The EDM used to make
the parts shown is a simple RC type. The software would be identical for pulse
type. "
Pete also sent pictures/diagrams, if anyone is interested I can email directly
or post on imagebin.
Dave
>
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