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Thread: Help

  1. #1
    I have mach 3 running on generic Chinese cnc mill which has been calibrated for axis movement. With gcode output from Aspire, I tell it to create a square 25mm x 25mm x 5mm deep, the square comes out at 23.6mm square and 4.9 deep. I have measured axis movement of 150mm using MDI and that measurement is spot on. I'm thinking there's a setting in mach3 that I am missing. Any help greatly appreciated.

  2. #2
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 22 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,822. Received thanks 346 times, giving thanks to others 8 times.
    If the axis movement is accurate over 150mm, then it's very likely a combination of cutter/machine deflection, and backlash.

    A DTI would let you know where the problem lies.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #3
    Quote Originally Posted by m_c View Post
    If the axis movement is accurate over 150mm, then it's very likely a combination of cutter/machine deflection, and backlash.

    A DTI would let you know where the problem lies.
    Thanks for the reply m_c, can you explain how to use the "DTI" in this situation please?
    Last edited by clivemgriffiths; 09-02-2023 at 12:12 PM.

  4. #4
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 22 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,822. Received thanks 346 times, giving thanks to others 8 times.
    Dial Test Indicator.
    Set it up so it's against the spindle cutter, then try push/pulling the cutter to see who much movement you get.
    Then also use it to manually jog the machine and see how much backlash there is in each axis.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  5. #5
    Will give that a try, thanks for your help.

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