Need Help! Grbl mill X axis dropping out

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Thread: Grbl mill X axis dropping out

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    Default Grbl mill X axis dropping out

    Hello
    I have just completed a medium sized hobby CNC mill. It is arduino uno based connected via breakout board to the motor drivers, these are TB6600, stepper motors are Nema 23HS2430B rated 3 amp, power supply is 36 volt 16 amp.
    I am trying a very simple oval cut, the that the first straight cut completes, the 180 degree at the end completes, the next straight cut completes but the final 180 degree only completes to 90 degrees then the cut is just straight as the X axis has stopped. I have tried other operations but the X axis will drop out. If I cut the power to the stepper driver the X axis will resume. I have reloaded grbl, also changed the arduino board and the stepper drivers. I am just running the machine without any work piece so there is no undue resistance on the motors. This is the gcode that I am running
    ( Post Processor :- M_GRBL_09Sep2018 )
    ( Part Number ID :- HorizontalSlot )
    N5G21G17G90G40G49G80
    N6G49
    N7 ( TOOL CHANGE : End Mill 10mm Dia )
    N8G93
    N9G0X-15.0Y30.0F500
    N10G0Z3.0F500
    N11G1Z-3.0F100
    N12G1X0.0Y30.0F200
    N13G1X80.0Y30.0F200
    N14G2X110.0Y0.0I-0.0J-30.0F200
    N15G2X80.0Y-30.0I-30.0J0.0F200
    N16G1X0.0Y-30.0F200
    N17G2X-30.0Y0.0I0.0J30.0F200
    N18G2X0.0Y30.0I30.0J0.0F200
    N19G3X5.178Y35.178I0.0J5.178F200
    N20G3X3.661Y38.839I-5.178J0.0F200
    N21G1X0.0Y42.5F200
    N22G0Z50.0F500
    N23M09
    N24M30
    %
    Is there something in here that would cause this error?

    Thanks for any help

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    Default Re: Grbl mill X axis dropping out

    @Brandon99
    I have checked your Gcodes using the latest (nightly build) UGS platform. According to the toolpath colors, there is something wrong in the 3e arc quarter. So the problem is the Gcode send, not the controller.

    If you look at the arcs tool paths, they should be all the same (clock wise = G2).

    In some of the arcs, you are using G3 counter clock wise!
    There a 4 arc quarters and 5 arc Gcodes.

    Check you tool paths and fix the 2 problems.


    In future: Always look at the visual tool paths before you start milling

    You are using an old GRBL version (0.9). If all is working well, try to update to GRBL 1.1G



  3. #3
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    Default Re: Grbl mill X axis dropping out

    Hello

    Thank you for your help.
    The gcode is produced by a commercial programe, I passed your comments to then and they returned with this:-

    N9G0X-15.0Y30.0F500
    N10G0Z3.0F500
    N11G1Z-3.0F100
    N12G1X0.0Y30.0F200
    N13G1X80.0Y30.0F200

    N14G2X110.0Y0.0I-0.0J-30.0F200 - These two arcs complete the right hand end of the slot
    N15G2X80.0Y-30.0I-30.0J0.0F200

    N16G1X0.0Y-30.0F200

    N17G2X-30.0Y0.0I0.0J30.0F200 - These two arcs complete the left hand end of the slot
    N18G2X0.0Y30.0I30.0J0.0F200

    N19G3X5.178Y35.178I0.0J5.178F200 - These two arcs complete the ‘Roll Off’ operation where the tool exits from the contour.
    N20G3X3.661Y38.839I-5.178J0.0F200

    N21G1X0.0Y42.5F200
    N22G0Z50.0
    N23M09
    N24M30


    Do you think GRBL 1.1 would help with this?

    Thanks



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    Default Re: Grbl mill X axis dropping out

    @Brandon99

    The comments to the gcode are correct.

    I opened your gcode again in UGS and send them to my GRBL 1.1g controller. It accepted them without any error. The tool path colors in UGS now also looks OK (strange).

    I reopend UGS and the test file again and now it looks again strange. The tool path color also isn't grayed after it was done. Weird, I will try again tomorrow using another gcode sender.


    I don't think GRBL 1.1 is the solution but it is worth a try. You have to check the wiring. If I remember correct, there was a pin swap from version 0.9 to 1.1
    Before you upgrade, make a backup of the GRBL settings to file and print them.



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    Default Re: Grbl mill X axis dropping out

    if I cut the power to the stepper driver the X axis will resume
    The TB6600 driver has an over current and over temperature protection.

    The TB6600 drivers have a potentiometer to set the current. Set this potentiometer half way to reduce the current to about 2A and try again.
    Check if the driver gets hot.
    Swap the X-axis and Y-axis driver to see if the driver is the problem.



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    Default Re: Grbl mill X axis dropping out

    @Brandon99

    Today I processed your file using gcode sender candle 1.1.7. It run without any problems.



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