Re: [CAD_CAM_EDM_DRO] Re: Home-built EDM

Home Machinist has a book on the subject. Here is the URL. For $18 it could be a bargain.

http://www.homeshopmachinist.net/store/index.cfm?


curlocation=2&dig=1&itemnum=EDM&start=1&maxrows=10
--- Graham Stabler <eexgs@...> wrote:

>
> I don't think most EDMs are very aggressive. The sparks won't be
> concentrated either, they will simply jump over the shortest
> distance. Eventually the gap will be such that no sparks are
> produced and the tool can then be lowered again.
>
> I have plans for an EDM and a very good Russian book but it will be a
> while till I can have a go making one proper. Definate wish list
> though.
>
> Good luck with it
>
> Graham
>
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Rich" <rmancini@h...> wrote:
> > I just completed construction of a home-built EDM from an article
> by
> > Arnold Gregrich in Home Shop Machinist (October/November 2002).
> > The initial test results were disappointing to say the least. Using
> > plain tap water, I could hardly get any sparking at all. When it
> did
> > spark, there didn't seem to be enough power to start a hole, much
> > less burn clean through a piece of 1/16" thick steel. I changed
> over
> > to deionized water with no real improvement. The sparks seem to
> > wander and not concentrate in one area.
> > These are the specs: Used two 3600 uf caps, a 400V rectifier and
> 200
> > watt light bulbs in both sockets. The electrodes I tried were .062"
> > mild steel welding rod, �" copper tubing and a piece of a
> telescoping
> > car antenna (chrome plated brass which didn't work at all).
> > If anyone is familiar with this machine, I sure could use some tips
> > on increasing performance. I need more aggressive sparking, but how
> > to achieve it is the question.
> > Rich
>
>
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