Re: [CAD_CAM_EDM_DRO] Re: ECM, The poor man's EDM??

Graham, I was at a tool show the other day and they had an EDM type machine that did exactly what you are describing. Not sure what they are using for an electrode. It looked like a brass rod. I talked to them breifly and the machine was for starter holes. It was only $20k..:-)

Ron

Graham Stabler <eexgs@...> wrote:

You can use a rotating electrode where the insulator extends beyond
the conductor but only intermitantly, that way as it rotates the
workpiece sees the electrode for half of the time (say).

The supply needed is just a DC supply, for what I was doing something
along the lines of 40v 5A is fine.

Graham

>
> If I can envision what you are saying, the insulation prevents the
> hole from being larger than the electrode, that is until the bottom

is

> cut deep enough that the sides start to be eroded.
>
> What about a rotating electrode, with one point that is a conductor.
> 90% of the cut would be down, 10% sideways.
>
> Easier than EDM ? what type of power are you using ?
>
> Dave
>

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