Re: EDM

Scott,

Thanks for the quick reply and info.

Here are the questions that come to mind.

You suggest a 60 v power supply. What happens if you up the voltage?

What type of amperage does your power supply provide?

What type of caps are you using for the spark and how large a value?

I am not following what you mean by adjustable on/off times.

By adjustable power setting do you mean the capacitance or the voltage or
both?

Can you give details of the op amp circuit that controls the steppers? I am
assuming it outputs a step and direction signal to the stepper controller
board?

Where do you get the graphite for the electrodes and the EDM oil from? Any
suggestions for a source that sells small quantities?

Thanks in advance for you help in this.

Tim
[Denver, CO]

----- Original Message -----

> From: Scott Acorn <sacorn@...>
>
> Hi Tim
> Well its a long story !
> The machine i have is the result of about 5yr. of design and dev.
> This machine will do some very fine work and i use it for making
> plastic injection molds.
> It has adj. on off times as well as adj. power settings.
> The ram is powered by a small stepper with a small belt reduction set up,
> so each step moves the ram down a very small amount.
> A op amp ckt. looks at the voltage across the gap while the machine is
cutting.
> this in turn tells the ram stepper to go lower or to backup.
> I can keep yoking but it may be boring if i do.
> so if you would like any other info. just ask--- if the interest is their
i can answer
> just about any question on edm that you might have.
>
> 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
> edm power supplies---use a step down transformer 60v is ideal.
> best electrode mat. ---- graphite
>
> I guess the bottom line would be ----edm mach. can be very simple or very
> complex---it all depends on the work you plan to do.
>
> Scott Acorn