*The BIG picture is use metal cutting tools if they will cut, at all, in
your part. If they will cut then EDM is most costly. Thats the big
There are a number of isolated exceptions to this rule.
*I have a 304 sst piece which has an involved shape, aprox 1" x 2" long,
which I have EDMed. It is .005" thick. They stack them up a couple of
inches deep and can cut them effectively.
*EDM hardened steels.
*If you have a very involved shape (maybe a heatsink) and you want to
prototype one or two pieces. Wire EDM would be a good choice.
It might be helpful if you could explain what your situation is, so we could
be more focused in our answers.
Post by Candy-o
When do you decide to use the EDM method vs. CNC machining?