Looking into Stepper motors now, for a large OX,

General CNC CNC Routers
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1

Looking into Stepper motors now,
for a large OX, What is the best motors option and why ?
torque needed (more is best ?), power vs weight ?
270-> 425 Oz/In ?
With 2 motors on X, can we mount less powerful one ? (or is it just useless remark I made)
on Z would a Nema 17 sufficient, what torque do you install on yours ? (would be nice to save on a 4th external stepper driver and using onboard Smoothie 4XC built in (limited to 2A))
Witch external stepper driver would you recommend ? (DM542A …)
thank you for your input !

2

The big easy driver from sparkfun is a cheap quality stepper driver. I have one working on a TinyG now. Not sure what specs smoothie require for external stepper drivers.

3

Haha ok maybe you are right but for my 4th axis where all I need is to rotate a cylinder for laser engraving torque is not an issue. :+1:t4: +Peter van der Walt

4

i have 23’s on everything and wouldnt use 17s. not worth the hassle.

5

I also have 23’s on everything currently. However I am building a 4th axis using a Nema 17 since only low torque is needed for my purpose.

6

Same project here !
My drivers short list is DQ542MA, DM542, and CWD556.
Current preferred steppers are 4Nm NEMA 23, double shaft, for all axis.
PSU should be 48V, 600W, 12A.

7

High Torque http://openbuildspartstore.com/nema-23-stepper-motor-high-torque-series/

8

Hello @Mary_Daly ​, thanks for pointing back home :slight_smile:
Is there any complete tech doc for these steppers ? I’d love to know more, specialy about inductance, inertia and torque curve…

9

@Jeremie_Tarot ​ the torque curve can be found in the product gallery. You may be able to find full spec elsewhere.

10

@Mary_Daly thanks a lot, inertia and inductance are in too :+1:

11

I have a few 270oz/in low voltage steppers that are very old (but never used) and I bought a few DRV8834 (low voltage drivers). Not sure if I should use these or spring for the OpenBuilds high-torque which are more oz/in and can be driven at much higher voltage.

I’m not clear on the functional difference between a low-voltage and high-voltage stepper (and Googling hasn’t revealed anything concise). Anyone have a good answer?