Re: [CAD_CAM_EDM_DRO] Re: EDM machine

I have a GKN sinker edm sitting here that I need to get running. It has
a sump full of oil that looks and smells like hydraulic oil. Anyone
familiar with this machine? Made in the UK. Carey

dave engvall wrote:

> > I haven't found any water that is pure
> > enough to not electolyze. ---- Jon Elson
>
> I suspect that the electrolysis of water is a function of exceeding a
> certain potential. From there on the production of hydrogen
> and oxygen should be related to current density. i.e. at 100%
> effeciency one columb/equivalent of oxygen or hydrogen produced (by
> definition).
>
> I don't know of anyone that uses water for sinker edm. AFIK the good
> electrolytes for sinker are relative pure parafinic
> hydrocarbons.
> I bought 5 gals of rather spendy stuff. $100+/5gal after shipping.
> The hole drilling seems to be done with a brass or copper tube that is
> spinning and the flush goes down the tube. Sometime this is
> done at high presssure and the flow tends to stabilize the tube in the
> hole giving really nice (precise) holes.
> I can look up the brand (on the electrolyte) if you are interested.
>
> DI water is used for wire EDM and I always assumed that the flow thru
> the resin was set to keep the ion concentration, and
> therefore the conductivity, at a certain level.
>
> After you get all the servo and stepper boards in production this
> might make a really good project. <hint>
>
> I have some nice igbt's sitting here but not sure I know enought to
> use them.
>
> Dave
>
>
>
>
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