Re: stepper edm

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@...> wrote:

>
> As you know, the R/C has to build the voltage and works off the
> capacitors time constant. the electrlyte adds a very measurable
> resistance to the process and offers a path for the power to flow
> outside of the desired pulse. this extends the time of the charging
> as well as saps some of the dischage power.
>
> High pressure flushing would work, but for water, requires a large
> volume of really clean water.
>

I'm guessing you are recycling your water so it is gradually becomming
ionized. In a wire EDM they pass the water through a de-ionizing
resin. I've been having a bit of a look on the web and other than the
nuclear grade stuff used in EDM there also appears to be cartidges
available for aquarium use at about $14. You can easily set up a
system that pumps water through the cartidge when the water reaches a
certain resisitiviy, the circuit it just a potential divider (one of
the resitors is two prongs in the tank) a transistor and a relay at a
minimum.

Graham

p.s. Either that or a pressure washer :)