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My CNC machine is cutting parts wrong

Discussion in 'CNC Mills/Routers' started by JohnPL, Apr 13, 2023.

  1. JohnPL

    JohnPL New
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    I use Builds Controller on a Mac to control my Millright Carve King.
    It has worked perfectly until today.

    After cutting 60 parts perfectly, I took a break, leaving the computer on and Carve King breakout board on.
    After the break the parts were wrong; each part is wrong in a different way - no two parts are alike.
    The discrepancies are small - about 1mm.

    The problem seems to always be in the Y axis. For instance, when cutting a trough using multiple roughing stepdowns, one stepdown will be correct, and the next incorrect.

    Any ideas what could cause this issue?

    I'm using Builds Controller on a Mac. It's worked well for months until today.

    Thanks for any advice.
     
  2. Alex Chambers

    Alex Chambers Master
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    Most likely a mechanical issue - check for something working loose such as the grub screws in a motor coupler.
    Alex.
     
  3. JohnPL

    JohnPL New
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    Thanks Alex.

    I found this post that gives similar advice:
    But, when we see this issue, its usually mechanical, and then usually: setscrews slipping on motor shaft, leadscrew side, or pulleys shipping on motor shaft (you didn't mention what machine you have, so mentioning both) - for fear of stripping people undertighten the grubscrews.
    If those are tight, gripping the endmill and giving it a wiggle will help you see what else is loose / badly adjusted
    So yesterday I started tightening the setscrew in the motor coupler. As I was doing that, the coupler came apart - so that's clearly what caused the issue. Photo attached.

    Thanks again.
     

    Attached Files:

    Alex Chambers likes this.
  4. Alex Chambers

    Alex Chambers Master
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    Glad you found it.
    Alex.
     

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