Hello everyone,
Glad to finally start my own CRP4848 CNC router build.
Got all the extrusions from Ahren at CNC router parts, everything looks good so far!
Motors & Electronics:
Bought a Nema34 set from longsmotor on eBay:
- 4 x 1232oz Nema 34 bipolar motors (3.08V, 5.6A, 0.55Ohm/phase, 8.4Nm (torque)
- 4 x DM860 stepper driver (7.8A, 256 Microsteps)
- 4 x 350W / 60V / 5.6A power supplies (don't ask why there are 4 of them??!! . Gonna get one to handle all motors.
- 1 x cheap breakout board that doesn't deserve to be called a breakout board basically.
My experience with electronics is still at the beginner stage, I would truly appreciate any advice from the many experts' on this forum!!
My inquiry is in regards to the power supply I need for my Nema 34 setup. I have done a bit of research and hopefully have calculated the V and amps needed correctly:
- Voltage required: 3.08 x 20 (need 10 to 20 times the voltage of the motor) = 61.6V
- Amps required: 5.6 x 4 x 0.66 = 14.8A. (Sum of all motors' amps times 4 times 2/3)
If my calculations are correct, I'll need a 60V power supply with at least 15A
Please correct me if I'm wrong.
Here's my question: should I get a 56V x 20Amps (KL5620) or go with 60V x 20Amps (KL6020) power supply to be safe? Or do I need even more powerful PS?
Here's the link to the supplies: Toroidal Power Supplies | Automation Technology Inc
The difference is significant to me in terms of size of the units - the 60V is much bigger, heavier (no clue the height, but probably much taller also!)
If 56V will be plenty for my application - I'll definitely like to go with that one rather.
Here are my next steps for the build:
- order for PMDX-126 Board and PMDX-107 (VFD spindle controller)
- order 220V air spindle
- order VFD (will probably go with the cheaper version to save money for now ...Huangyang VFD)
- still contemplating on whether I'll need the Smooth Stepper - not really sure the advantage besides the fact that I'll be able to use my laptop (and no need to printer cable)
- order the correct Power Supply (please help!:)
I will be posting pics and the process/updates of my next steps of my build in next post shortly!
Cheers,
- Dex