polsnart:
Anyway, is there any specific bipolar steper, that you would recommend?
I would recommend a NEMA42, triple stack. about $800, and a Gecko driver, about $150. a troid transformer as the basis for the power supply. trying to use anything less on a 10,000 pound cast iron milling machine will not work as well.
actually, you can by one for under $300 with a driver on e-bay. but you need 3 for your 3 axis milling machine.
that is if your project is to power a CNC milling machine.
a lot of hobbyists just take apart old printers and scanners and fax machines. alas, they offer tiny motors that are only good for projects like robots and such. old floppy drives are another souce.
if you have a computer repair shop nearby, stop in tell them you are a hobbyist and want to take apart some old scanners for the parts. scanners are better than printers. printers usually have gears, scanners often have belts.