Re: emc for wire edm control

[Bob Simon <bsimon-at-qualmach.com>]

At 15:53 3/12/2003 -0500, you wrote:


>Marcel
>
>I have done a bit of work here and with Roland Friestad planning for such a
>retrofit.  He has a two axis Agie wire EDM that is a few years beyond factory
>service.
>
>We had planned to use an analog signal for wire current but your approach
>also sounds interesting.  This could simply be a voltage up signal
>optocoupled to a parport pin and read by tkio.

>-------------------------<snip>-------------------------------------------------
>On Wednesday 12 March 2003 12:18 pm, Marcel wrote:
> > Hi
> > I want to know if its possible to change emc to control a two axis wire edm
> > machine. A wire edm machine need to be able to go back when the cutting
> > voltage is low (shorted) and only start to go back to the cutting direction
> > when voltage is high Regards

------------------------------------<snip>--------------------------------------

An EDM monitors the operator selected gap voltage to determine cutting 
speed. If the voltage drops the feed rate slows down. Only when there is a 
no-voltage situation will it actually back up. I think you will still need 
to deal with an analog signal to make it work.

-Bob