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Electronics Choices for a Workbee

Discussion in 'CNC Mills/Routers' started by IanC, Jun 18, 2018.

  1. IanC

    IanC New
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    I'm considering building a Workbee, but I'd likely buy a 1000mmx1000mm mechanical kit, as I've got plenty of spare electronics parts from previous projects and I like things to be highly modular.

    I was going to re-use my CNC shield and Arduino, along with DRV8825 drivers - but I don't know if this will be good enough for the 4 x 175oz stepper motors. I already have a 350W 24V PSU, which I was planning to use with these (if it's powerful enough).

    I notice that a lot of people here directly interface some DQ542MA (or leadshine DM542T) steppers with an Arduino - could I run 4 of these and the 4 x 175oz steppers from a single 350W 24V PSU? If that's do-able, I'm tempted to go down this route as it's very modular and I can re-purpose them in future.

    Also, as the machine uses 4 stepper motors - do I need 4 separate drivers or can I connect the two steppers on the same axis in series to share a driver and make do with 3 drivers?

    Many thanks for any advice!
     
  2. Gary Caruso

    Gary Caruso OpenBuilds Team
    Staff Member Moderator Builder

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    Hi IanC, The PSU is good, I would go with the discrete 542 drivers, will be more power headroom and reliable.
    You probably have a Arduino Uno? to make hookup easy get yourself a screw-shield like this, one of thousands listed , can probably find one shipping from your country and it will be quicker.
    Cheers
    Gary
     
    Peter Van Der Walt and IanC like this.
  3. IanC

    IanC New
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    Hi Gary,

    Thanks for the info - I've not got one of those screw shields, but they look great - I'll order one now :). Yep, it's the Arduino Uno I've got.

    It looks like I can buy official leadshine DM542 drivers for the same price as the DQ542MA, so I guess it makes sense to get the former? Glad to hear I can run 4 of those and the steppers from a single 350W 24v PSU :).

    Do you know what current I should aim to run the motors at? Also, any thoughts on running the dual stepper axis in series?
     
  4. Gary Caruso

    Gary Caruso OpenBuilds Team
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    IanC,
    Yes I got mine from Openbuilds because the support is great.
    While you technical could run 2 of those motors from one driver, it's frowned upon here ;)
    Set the current to just under the rated current of the motor, and see how warm they get, you want warm but not super hot.
    Cheers
    Gary
     
    IanC likes this.

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