I should add...buy at least 200 step per rev motors, that way, you get decent resolution. For example, if you use 10 pitch screws, you will get theoretical accuracy of .0005" or half a thousands of an inch.
Bipolar motors need bipolar driver cards. (Eg. Xylotex) Unipolar motors can be wired unipolar or bipolar. Unipolar motors can be driven by an unipolar driver (eg. stepperworld FET3)
For a small to medium size home made router you should be looking at 60-100 oz motors. Mine is 12x24" and uses 100 oz. unipolor motors.
Eric
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