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Center Mounted Single Y Axis Stepper?

Discussion in 'Concepts and Ideas' started by Josh Mascote, Aug 11, 2014.

  1. Josh Mascote

    Josh Mascote Journeyman
    Builder

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    Is there a reason all the CNC router builds have 2 motors on the Y axis?

    I have found some designs elsewhere that have a single center mounted stepper. Is it a racking concern or torque?
    Something simliar to this: http://www.instructables.com/id/DIY-CNC-Router/step18/Y-Axis-Assembly/

    I was contemplating using a ballscrew in the center and a single stepper.
     
  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
    Staff Member Moderator Builder

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    Yes, racking is an issue but as most of the CNC designs move the gantry rather than the platform, there hasn't been much effort focused on a solution. It's fairly easily overcome though. Just run a center rail down the middle underneath the platform with guide wheels at both ends of the board.
     

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