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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > started my cnc conversion for Precision Matthews PM-25MV Mill
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  1. #49
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    Jan 2012
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    56

    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    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

  2. #50
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    Aug 2005
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    875

    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Quote Originally Posted by rmachinist View Post
    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


    Sent from my iPhone using Tapatalk Pro
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    Homann Designs - http://www.homanndesigns.com/store

  3. #51
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    Jan 2018
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    289

    Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    We can't get anything 'great' in the u.k. imo (it sucks).
    Looking like these are what I'll be going with:
    https://www.cnc4you.co.uk/Stepper-Mo...H401-03-Nema23
    They're 4nm with 3mh inductance so I'll be using them on 60v supply for x,y.

    I'd like closed loop but not as a 'kit' which is out of budget.
    Something like a 4.5nm motor around 2mh ind, 80vAC driver and a 2x 35vAC toroidal wired series for 70v.
    Ah well, maybe later on

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