I made a sinker EDM (aka Tap buster) based on a munge of Ben Fleming's earlier book (available on google docs, or archive.org from memory). It uses a capacitive discharge for the arc (disposable camera flash capacitors are great for this), and the rest is parts from ebay, jaycar, etc
the electrode is shaped from arc gouge electrodes, and works well enough.
some video of it running:
I have enough projects waiting to complete before I look at wire EDM.
Bookmarks