Re: [CAD_CAM_EDM_DRO] Re: EDM design

Are you mechanically(vibrating) the electrode? My machine
a vintage Electron Drill is basically just a welder with a
vibrating electrode and a mixture of water soluble oil and
water. It has an automatic feed. I have tried to get a manual
for it, but it is so old and the company was sold. I cleaned it
up it runs just fine. The main job is taking apart VW roller bearing
cranks.

bob mcknight phoenix arizona




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "milespaul2004"
<milespaul2004@y...> wrote:

> Hi.
> Can anyone help.
> I have almost finished building a small spark erosion machine to

use

> in my home Model Engineering workshop. I am have a finished but

basic

> prototype working but I wish to modulate the voltage with a PWM
> signal and I am having some difficulty in getting output stage to
> work. I want to use an IRG4PC50KD IGBT to control the 70V DC 30A
> output. Radio Spares Technical said no driver was required but after
>

several

> failures (I only have four IGBT's left), it seems now that I do
> require a driver circuit but cannot find a great deal of

information

> on them. IXYS do a paper on IGBT drivers and show a device IXDD414
> with what looks like a simple and ideal circuit but there's the

rub.

> I can not find a supply of IXDD414's unless I wish to puchase 1000
> plus and quite frankly I don't have the cash or inclination to do

so.

> There must be someone amongst you clever guys out there who can

help

> me out.
> Has anyone seen a suitable circuit in a book they have if so could
> they email it to me. I want to get this damn machine working for I
> have numerous small jobs for it to do.
>
> Regards
> Paul Miles
> UK

Visit the digi-key website and put in mosfet driver and start to
follow the forms.

There are a few listed on their site.


Also, there are a lot of mosfets out there and you may be able to find
something that will operate on the TTL levels and not need such a high
current to turn on.

I would reccomend that you try some other mosfets in the event you
cannot get these to work.


Dave





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