Quote Originally Posted by martin_05 View Post
Here's the motor set I am considering right now.

US SHIP 3Axis Nema34 Stepper Motor 880oz Dual Shaft Driver DM860A CNC Router | eBay
Calling those motors cr@p would be an insult to cr@p. At 15 mH inductance, they will be absolute pigs speed-wise. They may have lots of torque at low speed, but that torque will disappear quickly as speed increases, and you'd likey end up having to tune for low speed, and low acceleration, to keep from losing steps. A good motor will have low inductance, certainly under 5mH, and ideally lower than that.

Even for $300 I wouldn't touch that setup.

Regards,
Ray L.