Motor & Driver setup

[John S]

Whoa,
Those 650 Ncm motors are right big bastards, the sort you need on a Bridgeport.
What are you driving ? Bigger is not always better.

[1] You have to overcome the torque detent when parked and because they have a larger mass they accelerate slower so very often a smaller motor can deliver more power because it gets there quicker.

[2] Those 4.2 amp driver will power it but at a crawl, the motor is 5v rated, the driver to stay within safety limits needs to be about 40 to 44 volts MAX, that's just over 8 times the motor rating.
To get a decent performance you need to be close to 20 times so these drivers are not going to do it with this motor.