Re: [CAD_CAM_EDM_DRO] Digest Number 1522

Hi Ian,
More than ten years ago, Model Engineer magazine published a design
for an EDM which had a very small stepper driving the electrode through a
screw. It basically drove forward into the workpiece until it sensed a
short, whereupon the stepper was reversed to withdraw the electrode.

I remember there was an improved drive circuit published using a 556
and a stepper driver. As far as I remember, the sensing was done across a
very low value resistor. If there's any interest I'll try to dig it out
and make it available.

Regards,

Philip Mac Cabe.

> From: "Ian Wright" <Ian@...>
>Subject: Re: Another EDM Approach
>
>Hi,
>
>I wouldn't really want to get an EDM anywhere near a PC I was bothered
>about.