Help regarding my CoreXY


  • administrators

    1. To change to a right hand coordinate system, add parameter Y-1 to your M667 command, or swap the X and Y motor wires.

    2. The jerky Z movement probably means that your Z acceleration in M201 and/or maximum Z speed in M203 is set too high.

    HTH David



  • @dc42:

    1. To change to a right hand coordinate system, add parameter Y-1 to your M667 command, or swap the X and Y motor wires.

    2. The jerky Z movement probably means that your Z acceleration in M201 and/or maximum Z speed in M203 is set too high.

    HTH David

    I have set acceleration and maximum speed too low. Now Z is moving very slowly.
    Still it is having jerks.
    My motors are rated for 2.5A with 4.8kg torque.
    So, if I give 1600mA current (around 65% of rated current), will it be sufficient to hold Z axis?
    I have another set of motors with 5.5kg torque with 1.5A current rating. Shall I change it?


  • administrators

    Do the leadscrews move smoothly and easily if you turn them both by hand? Perhaps the Z axis is binding.



  • Yes. It runs very smoothly without motors. Even after fitted with motors it is moving freely when turned with both hands.
    How to get rid of that binding.?


  • administrators

    If you are running a Duet 0.6 at 1600mA then the drivers may be overheating. Are you cooling the Duet with a fan? B!owing air along the line of drivers on both sides of the PCB is best. Reducing the current to about 1300mA may improve things if this is the problem.



  • I have provided 60mm dc cooling fan for the duet 0.6 board.
    It cools both top and bottom layers.

    I initially started with 1200ma faced the jerk, then increased to 1600ma.

    For Z binding lubrication will provide solution?


  • administrators

    If it is moving freely when you turn it by hand, then binding may not be the problem.

    What is the Z steps/mm in your M92 command?



  • @dc42:

    Do the leadscrews move smoothly and easily if you turn them both by hand? Perhaps the Z axis is binding.

    I hope finally I got some solution. As you said it may be Z axis binding, I googled and found some other forums suggesting to use Lubrication for the smooth rods.

    I didnt find any non greasy oil, so I used normal vechicle grease for the smooth rods and coconut oil for the lead screw nuts. It worked fine. Immediately, jerk stopped. Now it is running smoothly. Also, slowly increasing the acceleration and max speed for Z axis.

    Always it is a wonderful thing to get help from this forum. Thanks for everyone who has helped to identify the problem.



  • I was just bragging about his awesome support in the folgertech FT5 forum… looks like another duet wifi for an ft5 has been sold LOL Thanks again David, i have been doing tech support for over 30 years and never seen anything like this. Paid through the nose for CISCO TAC and that doesn't even come close to this level. You are Da Man! 🙂



  • @dc42 said in Help regarding my CoreXY:

    1. To change to a right hand coordinate system, add parameter Y-1 to your M667 command, or swap the X and Y motor wires.

    2. The jerky Z movement probably means that your Z acceleration in M201 and/or maximum Z speed in M203 is set too high.

    HTH David

    In the "Configuring RepRap Firmware for Core XY" doc it says:

    "Important: make sure that you have chosen a right-hand axis system. That is, looking down on the printer the +Y direction should be 90 degrees anticlockwise from the +X direction. If instead it is 90 degrees clockwise, you have a left-hand axis system, which will give you mirror-image prints."

    But there's no note on this setting. My CoreXY is right handed, and this forum reply was the answer I needed. Maybe the doc could be updated?


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