Hi Everyone,

I have been making home made PCBs for some time and feel its time to automate the drill process with a small homebrew CNC machine.

I have the mechanical design in hand using a 10" x 10" table, I've bought 3 x 1.8 degree NEMA 23 1Nm Steppers from AstroSyn and am now looking at a suitable controller.

As its a PCB drill rather than a mill, with 0.7mm holes being the most common size I'm drilling, I thought I would get sufficient resoltion if I were to buy / build a controller that supports half step drive. While it sounds interesting to develop I don't think microstepping is needed.

I've looked at TOSHIBA TB6560 3 axis controllers on ebay, and also looked at schematics using MOSFETS and Driver chips.

Any advice, items to avoid and info on recommended designs to build is appreciated.

Regards
Pete