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  1. #1
    Join Date
    Sep 2003
    Posts
    1480

    3D printing round parts out of round

    I printed a 54 tooth gear for my South Bend lathe so I could cut 16 threads per inch, put it on the lathe and it only rotated about an inch. Measured the gear and it was 0.015” out of round.
    If I had results like that from my CNC that would mean that the steps per inch were either off in the X or Y axis and I would set those to be correct and that’s it.

    How Does the 3D printer address an out of round which either the X or the Y steps per inch is not set right, how do I adjust the steps per inch in my 3 D printer

    My Printer: Maker Select Plus 3D Printer PN: 15711

    Thanks my old homemade CNC machine is still going strong.
    Thanks
    Hager

  2. #2
    Join Date
    Mar 2003
    Posts
    35494

    Re: 3D printing round parts out of round

    First thing I'd do is print a calibration cube to make sure it's the steps/unit.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  3. #3
    Join Date
    Sep 2006
    Posts
    245

    Re: 3D printing round parts out of round

    It might be that the X and Y axis are not perpendicular to each other. Circles (or gears) would become ovals.

    Other possibilities include loose belts or pulleys creating backlash. One common possibility is a loose set screw on the belt sprocket attached to a stepper motor. If it is loose, the motor can turn several degrees before the belt starts to move.

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