Re: [CAD_CAM_EDM_DRO] Re: software for EDM maschine

Hi Tom:
Does this mean that the electrode or wire never reverses but only pauses
or slows down in its pursuit of the endpoint described by the code?
I was always under the impression that the motion required active momentary
path reversal to allow gap clearing when gap conditions dictate.
I'm also talking about very small movements of the order of thousandths, or
fractions of thousandths.

Assuming the spark generator and gap sensing technology as well as the
flushing limitations of a hobby class machine, does it make sense to make
this more aggressive "motion centered" compromise in order to gain better
gap conditions, even at the expense of cutting speed, or would you prefer to
see a focus on increasing the quality of gap sensing and spark control and
keep the wire driving forward.
I envision this aggressive motion being similar in principle to pulse
flushing on a sinker (even though it's gap condition driven instead of
simply timed reverse motion as with my sinker).
It's not fast, but I can still do amazing things on my 1980's vintage sinker
by using this feature to keep the gap supplied with clean dielectric, so I
always assumed that it would be a sensible compromise in the absence of 300
PSI flushing pumps and de-ionizing resins and continuous conductivity
monitoring etc etc etc.

I'm most interested in your thoughts on this...it's rare to find someone who
has had any experience engineering these things.
Unlike with machine design for CNC milling, it seems almost like they have
to kill off any retiring engineers who know anything about this so the
secrets will never leave the factory :)!!
However did you manage to escape??
Cheers

Marcus

----- Original Message -----
From: <tomp_tag@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, March 22, 2005 4:27 AM
Subject: RE: [CAD_CAM_EDM_DRO] Re: software for EDM maschine


>
> The path is not reversed ( initially)
> the position on the path becomes a previous position
> the correct position for edm is according to the gap
> it's motion along the path is varied in velocity
> sometimes it moves a bit backwards,
> a 'cha-cha' motion along the path
> the path is only reversed when the gap dictactes a large change
> or when changing from gcode element N to N+1 with a small change.
> very stabile edm has very few temporary reversals and no large reversals
> tomp
>
> the way for you to learn how EDM works is to see it
> if you're lucky, ask for the motor pulley or couplingto be uncovered
> you will see a shaky erratic turning, generaly progressing in the
direction
> wanted (the shaky bit is only motions of a few microns).
>
>
>
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