Re: EDM, was Re: Cheap Encoders

hi Ian
I've got many ckts. notes etc on the machines i've made
It's going to take me some time to get it all together.
In the meantime it will have to be bits and pices-
Maybe in the fall i'll have a web page if the interist is there
For now best bet is to ask me ques.

Scott Acorn
"Ian W. Wright" wrote:

> From: "Ian W. Wright" <Ian@...>
>
> Hi Scott,
>
> Do you have a circuit diagram for your EDM and, if so, could you post it
> somewhere or let me have a copy with an email please? I built a simple
> EDM a while back but could never get the electronics bit to work
> consistently and I'd like to resurrect it from its resting place under
> the bench! Your machine sounds to be very well designed.
>
> Scott Acorn wrote:
>
> > Pit falls and dangers
> > use only edm oil in your mach. ------Fire
> > only edm in a sumerged tank of oil with a min. of 1" oil covering part
>
> I can second this from bitter experience! When I made my EDM and gave it
> its first try out I knew very little about the workings of such things.
> I had spoken to several people who used EDM at work but who seemed to
> know little about its technicalities. However, I was advised by a couple
> of them that the cutting fluid they used was White Spirit (Stoddarts
> Solvent) and that it was sprayed on. So, when I fired my machine up, not
> having equipped it with a coolant pump, I made a little dam of putty
> around where the electrode would touch and filled this up with White
> Spirit. As soon as the first spark was generated burning White Spirit
> was flung in all directions and I spent a frantic few minutes stamping
> out burning patches of carpet and trying to find hidden fires under the
> mess on the workbench. Needless to say I quickly changed the electrolyte
> and settled on another recommendation of 50% Antifreeze and 50% water
> which seemed to work OK.
>
> Best wishes
>
> Ian
>
> --
>
> Ian W. Wright LBHI
> Sheffield Branch Chairman of the British Horological Institute.
> Bandmaster and Euphonium player of the Hathersage Brass Band. UK.
> See our homepage at:- http://www.iw63.freeserve.co.uk or
> http://www.iw63.demon.co.uk/ or
> http://www.GeoCities.com/Hollywood/6067/index.html
>
> 'Music is the filling of regular time intervals with harmonious
> oscillations.'
>
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