Originally Posted by
jetpig1
I bought a 4 axis driver board from an engineer, but you can buy DeskCNC and a 4 axis board from the DeskCNC website. DeskCNC gives you true 4 axis interpolation. This means rotational milling, not just on-centerline cutting.
From there I just bought an indexer from LittleMachineShop.com and put a stepper from Automation Direct right on the back (omit worm gear, bad backlash) using a timing belt and gears from Stock Drive Products. The whole setup runs like a Fanuc 15M with a 4th axis.
Good luck,
-Geo