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  1. I use PM752 supplied with 65VDC. Transformer is 500watt.

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  3. #12
    And the beakout board you use is pcpps from zapp automation? Because in the manuals for this board is written that it supports only max 35V? But the board is using the same voltage as drivers?

  4. Please see 1st picture on my website - Control box http://malamuterun.co.uk/cnc/homemade_cnc_mill.htm
    There is two power sources.
    1. Toroidal transformer with 25Abridge and capacitor at the top for PM752.
    2. 25V power supply at the bottom for PCPPS-3 from zapp.
    Two power suppliers share ground/negative.

  5. Just looking at your proposed new drive system, isn't it bad practise to use two motors coupled together?

  6. Quote Originally Posted by m_c View Post
    Just looking at your proposed new drive system, isn't it bad practise to use two motors coupled together?
    So far the only problem I had it was when one of the belts snapped and then the other motor was pushing Y car's one side only eventually snapping the second belt or stalling the motor. That's why I decided to use one ,long, strong timing belt. Why do you think there may be any negative aspect of coupling the motors together ?? I've attached mounting plate pic. I'll try to produce it asap.
    Click image for larger version. 

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  7. Using two motors with one driving each side is ok, but I've seen it mentioned in various places that coupling two motors together can cause problems.

  8. #17
    Quote Originally Posted by primorc20 View Post
    Is this PM542 stepper driver? What voltage do you use?
    If you're deciding which driver to buy then get the PM752. The higher voltage will make the motors run with higher torque at high speeds, and thus faster overall.

    Currently I use the PM752 on 75v, though that should change in a few weeks when I've finished prototyping my 120v driver design...

    I'm also using a 500VA transformer with 4 of the 3 N.m motors.

  9. jupi machine alive again :))))
    First in order to cut proper steel motors mounting plate I've made "very sophisticated" 3mm MDF plate.
    Click image for larger version. 

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    I've put some corrections and CNC cut from 3mm steel plate, so far insides only.
    Click image for larger version. 

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    Some inside circle cut-outs are perfect to hold a material while machine cuts outside profile
    Click image for larger version. 

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    Just waiting for end result ;)

  10. #19
    i love it when a cnc makes it's self nice 1 mate keep up the good work. loving the pictures ;)
    there is no such thing as a stupid question, just stupid answers !!!!

  11. Thanks Chris
    ...and finished item
    Click image for larger version. 

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