Dear forum.
I have a diy gantry type router running with NEMA23 3ph steppers. 3,1Nm
Y-axis 2 motors for gantry D16 x 10mm Lead ballscrew. Gantry running on THK 16mm rails. Estimated 40kg.
X-axis 1 Motor for ?? x 40mm Lead ballscrew (IAI actuator) Estimated: 8kg
Z-axis on a THK KR33 actuator 6mm ballscrew. Estimated 3 kg

So I get fair good Rapids, but the system is tending to resonate espacially the Z-axis.

I was looking to convert to DC servos, at a max. of 300 USD pr. motor set that's including "everything needed"

My goal was to find a NEMA23 motor and direct driven to the 10mm lead ballscrew as that would be an easy replacement.
I did a calculation (MotorCalcs.xls from this site) for the torque pr. motor required and for the Gantry it's 0,52Nm (Rapids) and 0,21Nm (Cutting)

Initially i looked at at 2 pce DC Brushless 180W 0,57Nm Rated (1,71Nm Peak) servomotors for the double Y-axis, gantry drives.
Make:Leadshine Model: BLM57180

I have zero experience selecting a servo, and looked at DC-brushed, brushless and AC-servo. So what to select ?

Best Regards, Bo Andersen.