There's also the matter of environment; is it dusty, outside, extreme temperatures, just to name a few.
Have you tried DIY CNC forums?
There's already lots of hardware available that does what you need. Reinventing the wheel might not be the cheapest solution for you.
I have had a weakness for Gecko drives ever since I started researching DIY CNC: https://www.geckodrive.com. It's been nearly 10 years since I discovered them and I remember the developper being actively in touch with his customers. The emphasis was on quality and reliability, not bells and whistles.
If I had money, I'd buy Gecko kits for commercial use. But I'm broke, so I plan on building my own, over the next 50 years.
Robert
EDIT: There's tons of recommended reading on that site. I'd start with this just to get an idea:
http://www.geckodrive.com/support/choosing-a-drive.html





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