Y Axis Grinding

This topic contains 14 replies, has 8 voices, and was last updated by  Ryan 1 week, 2 days ago.

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  • #96093

    thannett
    Participant

    Hey folks – Ordered the MPCNC kit from the store here, everything was working well enough.  Couple of test cuts went well.  Now I’m having an issue that I can’t explain.  Any movement on the Y-Axis of the Mini Rambo results in angry “grinding” sounds from both motors.  Moving the connector from the Y-Axis to the X-Axis on the board and attempting to move works fine.  Link to a video of what’s going on is below.

    Kit I ordered – https://shop.v1engineering.com/collections/parts/products/mostly-printed-cnc-parts-bundle – 6A MiniRambo

    Video of my odd grinding noise – https://youtu.be/7p0Vo2kC8rA

    The face that the two Y-axis motors turn correctly while on the X-Axis connector, but not on the Y-Axis connector makes me think it’s the board.  The X-Axis motors exhibit the same behavior on the Y-Axis connector.  Anyone have some advice for me?

     

    Thanks!

    #96112

    Josh
    Participant

    Sounds like a loose connection, maybe try slightly bending the pins in slightly opposite directions for a more positive contact.

    1 user thanked author for this post.
    #96140

    thannett
    Participant

    Just gave that a try, and wasn’t able to notice any difference.

    #96144

    Barry
    Participant

    Recheck the pins.  Sometimes they get pushed out of the connectors.  That’s the exact sound steppers make when one coil isn’t firing.

    1 user thanked author for this post.
    #96148

    thannett
    Participant

    I tested continuity from the solder joints on the mini Rambo Y Connector through to the connector on each Y-axis motor, and then between the two motors.  No issues found.   Those the pins your referring to?

    #96237

    Barry
    Participant

    I was referring to the stepper wiring harness, but sounds like you checked the whole kit and caboodle.   What happens if you connect the y steppers to the x port on the rambo?

    1 user thanked author for this post.
    #96240

    thannett
    Participant

    It works correctly if I connect Y Steppers to the X Port.

    X Steppers also exhibit same failure connected to Y Port.

    #96242

    Bill
    Participant

    So you know it is not the steppers or the ports. That just leaves the wiring. Time to double and triple check them.

    #96257

    BT
    Participant

    To summarize,

    1. Everything was working, but now it is not.
    2. X wires & motors connected to X port, Y wires & motors connected to Y port – X moves fine, Y grinds
    3. Y wires & motors connected to X port, X wires & motors connected to Y port – Y moves fine, X grinds

    Just to be certain, have you checked the fuses on the Rambo?

    #96382

    Barry
    Participant

    Pretty sure if it was a fuse it wouldn’t move at all.

    #96387

    BT
    Participant

    I was wondering if there was a higher resistance on the fuse or power to the Y stepper leading to a detrimental voltage drop.  Just a thought before diving into troubleshooting the board.

    #96404

    Ryan
    Keymaster

    If you can’t figure it out you can reassign the bad axis to the open driver (in the pins file for your board). I single failed coil on these boards is unlikely but when wired in series you always have a spare.

    #96946

    Brian
    Participant

    Check the solder joint and see if there is insufficient solder on the legs of the connector or a solder bridge. Also, try reloading firmware, maybe a value got changed

    #99789

    Piotr Sliwa
    Participant

    Hi everyone

    So I have the same issue but on the Z axis (grinding)   X and Y work well with the same settings.  I tried everything in this post   I swapped the wiring and motor from the X axis with no change.  Still grinds on the Z even when the motor runs free.

    It all points to the board…. or some mystery setting in Marlin (I’m stuck here)

    Need help

    Pete

    #99806

    Ryan
    Keymaster

    Piotr, you should start a new thread and describe in detail you hardware and electronics, and pictures are a very good option for faster help.

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