Re: [CAD_CAM_EDM_DRO] Re[1]: wire edm info ( was Safety/Reliability )

Hi Peter,

Yes, I got the same impression when I watched wire EDMs but I suspect they
must have various 'failsafes' built in to take care of the times when the
wire shorts to the work as could concievably happen if the workpiece was of
varying thickness or just through bad programming, and for the times when a
wire feed jam or breakage occurs. Perhaps such safeguards aren't necessary
and I'm being unduly pessimistic (something I'm quite good at!), I don't
know. In any case, there must be some way of giving proportionate weight to
the axes from the feedback current - i.e. if the 'X' axis is moving at twich
the rate of the 'Y' axis a reduction in the feedback current will have to
have twice the effect on it if the cut direction is to be maintained. I'm
not a software person and this is well outside my abilities but I'm sure
there are people out there who could make it all clear and make helpful
suggestions which would allow the growing number of us who would like to
build wire EDMs to achieve our goal.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: <ptengin@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: 05 November 2000 21:20
Subject: Re: [CAD_CAM_EDM_DRO] Re[1]: wire edm info ( was
Safety/Reliability )


> Ian,
>
> I watched some wire machines cut. I don't think they move backwards. I
> could be wrong as the movement could be microscopic. Seems to me they
slowed
> down on large cuts, speeded up smaller cross sections. Perhaps they sense
> current and speed up when the current goes down and slow down when current
> goes up. The cutting looked to be continuous.
>
> Peter