I somehow thought you were using a Sumtor 42H34913A4 stepper motor, but can't find that anywhere on this thread. What stepper motor are you using for the XYZ axis? What stepper motor are you using for the spindle drive?
yes, that is the correct motor.
info I have on the motors:
detent torque: 0.40 Nm
step torque: 1.0 Nm
rated current: 1.3 A
step: 1.8 degrees (200 steps per revolution)
rated RPM: 600 RPM (from Chinese sites)
voltage: 24v (also from Chinese sites)
(measured) resistance: approx 3 ohm IIRC.
cost was: $16 per motor
I am running them at 12v, and thus far haven't got them going quite so fast, but this may be due to voltage.
the spindle motor is currently a normal Brushed DC motor.
spindle motor: ADRS550SH
voltage: 9-16v
max RPM: 20,000
efficiency current: 10A
stall current: 40A
stall torque: 0.34 Nm (IIRC)
(measured) no-load current: around 2A
(measured) resistance: approx 0.33 ohm
cost: $10 per motor
also have another type of motor available: CRS-550PH-8022AF
found stats were fairly similar to the motor above.
(measured) no-load current: around 1.4A
(measured) resistance: approx 0.2 ohm
(observed) slightly quieter than the above motor.
cost: $11 per motor
(actually, had intended to get more of the prior motor, but the seller sent me these motors instead).
the spindle is being driven directly by PDM, and will use a hand-wired H-bridge (will build one specifically for this, have used prior H-bridges with the same type of motor though, but they have more limited power output).
for the H-bridge, I will probably either use some MOSFETs (IRF540), or maybe doubled-up MJE3055T transistors (*), which should be able to handle around 20 amps or so...
*: would have to double-up the drive transistors and then do multi-stage Darlington boosting, which would end up requiring a fair number of transistors (12x MJE3055T, 4x 2N2222, and some 2N3904's as well). may be better just to use the MOSFETs.