Quote Originally Posted by DBFIU View Post
...Also, are you saying these motors have a a sort of dyno graph? One NEMA 23 can make more or less torque at 2 amps vs another NEMA 23?...
In a way yes there should be a graph that will show the different torque and what the amount of current drawn is at the particular torque figure. If I remember correctly, "The torque generated a the motor is proportional to the amount of current flowing through the motor." Basically what I meant is find 23's that will give you the most for their values:

Lets make an example:
You have 2 NEMA 23's.
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Motor A has 4.0Nm holding torque at 6A
Motor B has 1.6Nm holding torque at 2A
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On paper it seems as Motor A is more powerful (and it is) but if your driver can only supply 2A then it's not possible to run the motor at full torque.
If I'm correct in saying torque is proportional to current then Motor A will only push out 1.33Nm torque at 2A, making it less powerful then Motor B.

I stand to be corrected in the above statement, and please do correct me if I'm wrong. It's just something I came across when I was choosing motors for my CNC engraver. So keep those calculations in mind when looking for motors. Your drivers limited to 2A and that plays a big part.