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Gantry vs Belts vs Step motors what is the problem

Discussion in 'Troubleshooting' started by Ian Schilf, Feb 8, 2021.

  1. Ian Schilf

    Ian Schilf New Member

    Feb 8, 2021
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    Hello all.

    I am an industrial technology teacher in Montana. I have 2 Robo R2 printers and both appear to be acting up. I will go over the individual machines symptoms.
    Machine 1
    Prints lean hard on Y axis. On a 45mm tall print the lean is approximately 10mm.
    The machine is making a grinding noise on a x axis but not under manual control. Only when it is orienting the nozzle to the bed before printing begins. While watching the belts they are moving freely. I am watching the x step motor and seeing the backside of the x motor shaft kind of pulse in sync to the noise I am hearing. Could the motor be on its way out the door? I am looking at replacing the step motor to gantry belt but I am not sure if that is the solution. Any help would be helpful.

    Machine 2
    Same grinding noise as M1 on the x but without the lean on Y.

    We have redone the bed calibration multiple times, and the z offset, I have rehomed them. I have also checked for software updates. I have printed the gantry alignment tools on my other printer and begin that process but I do not think it would cause the grinding noise.

    Any help would be greatly appreciated.

    In Over My Head in a Montana Classroom
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Feb 21, 2013
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    Grinding is usually the endstop (one of them -- which ever axis is grinding) not getting triggered.
    My C2 had issues with the Y axis endstop getting knocked out of position.

    Sanity check them
  3. Lance Weston

    Lance Weston Active Member

    Jun 2, 2018
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    To get a vertical lean the two 12mm rods have become not square to the gantry. I do not see how that can happen, but I would check to see if something is loose in that path. I am having trouble with the grinding noise. Is the noise only when the head is homed? That would absolutely be the endstop switch not triggering. Otherwise it would either be the flange bearings which are not visible or a stepper motor with a failing bearing. Go to the LCD home then motor controls and turn off the motors. Now move the head around and see if it moves freely in all places. If it does it is probable a flange bearing that is failing.

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