Electronics > Projects, Designs, and Technical Stuff
Stepper motors and control for CNC router
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H.O:
The NEMA34 kit is likely overkill for this. The NEMA23-kit looks about right though.

Many of these kits boasts a high holding torque only to counter that with very high inductance which limits the speed of the motor for a given supply voltage. Those type of motors are generally suitable for belt- or rack and pinion drive where the rotational speed of the motor is fairly low. For a 5mm / rev screw drive the motors need to turn faster so you want low inductance/high current motors and the NEMA23-kit you linked to looks quite alright.

I would have liked a 48V supply instead of the 36V one but that puts it pretty close to 50V max of the included drive so... Those motors, 80V rated drives and a 60V supply would have been a nice kit.

I've had some grief from chinese ballscrew bearing support blocks. Not saying they're all the same but be aware.
cowasaki:

--- Quote from: H.O on December 02, 2018, 07:31:42 am ---The NEMA34 kit is likely overkill for this. The NEMA23-kit looks about right though.

Many of these kits boasts a high holding torque only to counter that with very high inductance which limits the speed of the motor for a given supply voltage. Those type of motors are generally suitable for belt- or rack and pinion drive where the rotational speed of the motor is fairly low. For a 5mm / rev screw drive the motors need to turn faster so you want low inductance/high current motors and the NEMA23-kit you linked to looks quite alright.

I would have liked a 48V supply instead of the 36V one but that puts it pretty close to 50V max of the included drive so... Those motors, 80V rated drives and a 60V supply would have been a nice kit.

I've had some grief from chinese ballscrew bearing support blocks. Not saying they're all the same but be aware.

--- End quote ---

TBH to Nema 23 was looking like my favourite choice.  I'm not stuck in going for a particular supplier or kit just at the moment nor is the ballscrew kit a final decision.  These are just examples of what I am looking at.  I'll look at a higher voltage power supply. 
bugrobotics:
Avoid the steppers and stepper drivers and go for an integrated servo drive like the Clearpath servos.  You can order the servos with step and direction inputs if you want.  Cost is around $230/per servo in the NEMA23 size.  Well worth it as you can tune them easily, they are pretty robust and you get much better performance over steppers. 
beanflying:
This one turned up in my youtube feed today. Nice video down to earth nuts and bolts design no BS and a shopping list of parts for you :-+

https://youtu.be/0G3tEE7HEDA
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