Shuddering during travel

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This topic contains 5 replies, has 2 voices, and was last updated by  Michael 3 days, 7 hours ago.

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  • #78325

    Michael
    Participant

    I have put together my new mpcnc, and the gantry seems to shudder back and forth slightly when moving. I bought the full kit from the store here, using the minirambo. I attached a picture of my setup in case there’s some obvious problem.

    I downloaded and ran the crown gcode, and there’s visible jitter in the lines, and they don’t always connect properly (see near the circle in the middle)

    Any thoughts on what might be causing this issue? My only thought is belt tension, but not sure if they’d be too tight or too loose to cause this problem.

    #78332

    Ryan
    Keymaster

    Not positive but it just looks like the pen is not on super solid (perhaps just pressed down too hard) and either the conduit or surface is a little rough. Running a few projects on it should smooth it out as the galvanizing wears in.

    1 user thanked author for this post.
    #78333

    Michael
    Participant

    The pen is on pretty well, and the shuddering is noticable even when moving manually with nothing touching the bed.

    I ran my fingers over the conduit and it does feel a little rough. I will try whipping up some gcode to move around a whole bunch and see if that helps smooth things out.

    Thank you!

    #78367

    Michael
    Participant

    I threw together a quick little python script to generate some gcode to run the machine through its paces, and attached the script in case it happens to be useful for anyone. It’s a .txt file since .py files aren’t allowed.

    Also added sample gcode output for my 600mm by 600mm work area.

    #78370

    Ryan
    Keymaster

    Also try loosening your tension bolts a bit. Too tight and it will run rough.

    #78381

    Michael
    Participant

    After running the gcode to move the gantry back and forth twice, I ran the crown again and it looks great! I even reran the crown from the same spot and it reproduced on top of the previous one perfectly.

    Thanks for the help, and many kudos for such a wonderful design!

    1 user thanked author for this post.
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