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Machine runs tool path but not to dimension.

Discussion in 'CNC Mills/Routers' started by KaosCNC, Nov 19, 2019.

  1. KaosCNC

    KaosCNC Well-Known
    Builder

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    I have moved onto my new CNC machine from using the MPCNC for learning.

    I am using the OB BlackBox and Control and also using the Vetric Vcarve software.

    I have my machine up and running and if I tell it to move 100mm it moves the correct length in the X and Y. I have not measured the Z yet... I think it may be off.

    I try to then run this 160mm x 160mm pen test and when the machine runs it's running way larger than 160mm.

    OB Control is set to MM - when I export the file I am using the GRBL mm post processor.

    I am totally lost and not sure where to start.

    the machine I has has 12mm lead screws in X and Y
     

    Attached Files:

  2. Giarc

    Giarc OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    How much larger is "way larger"? Twice as large? Four times as large, 25.4 times as large? Is this a file you came up with and designed yourself, or one in the Vectric software package?
     
  3. KaosCNC

    KaosCNC Well-Known
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    I finally figured it out. I had the incorrect steps but now it is updated and I ran the file and the pen test came out just as expected.
     
    sharmstr likes this.
  4. Giarc

    Giarc OpenBuilds Team
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    That is good. The first thing I would have suggested was the steps since you are using a different screw than most, but you said you sent it 100 mm and that is how far it went so I assumed you calibrated the X and Y.
     

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