Re: started my cnc conversion for Precision Matthews PM-25MV Mill
Originally Posted by
rmachinist
when shopping for steppers motors do you know of a good source buy them from reasonable priced ? what size of power supply you think i may need
570oz.in on the X & Y axes are suitable. The Z is a bit more problematic. I use a 570 on the Z with a 2.5:1 belt reduction. Also I’m driving these from a G540 that is only supplying 3.5A per phase, whereas the motors are rated at 5A. The motors are only supplying about 400 oz.in per phase.
As you can see from the video below the performance is fine.
https://youtu.be/AjfhQUBjBjI
I’m in the process of converting it to a power drawbar which will add weight to the head. It will be interesting to see how it goes then.
Quite a lot of people use a 970oz.in or 1200 for the Z axis.
Assuming you are in the USA automation direct.com has suitable motors and power supplies.
To size the power supply, add the rated current of the 3 motors and then multiply by 2/3. For three 570 motors rated at 5A your power supply should be rated at 3*5*2/3=10A
Also, use a 48Vdc supply.
Cheers
Peter
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