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small circle cuts with flat side.

Discussion in 'General Talk' started by gazingm42, Feb 17, 2019.

  1. gazingm42

    gazingm42 Journeyman
    Builder

    Joined:
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    I have a cnc system which uses the thread rods, 2 Y motors, x motor and z motor. All connected with
    the coupler with 2 set screws between the motor and threaded rod. Using vcarve desktop and tiny g.

    I been using it for about 2 years or so cutting 100's of projects.

    I was making a project cutting a few small 13mm holes in a piece of wood using 1/4" end mill bit. Each of the holes cut with a flat side. I adjusted the speed rate and direction etc but still get the issue.

    After reading on the internet. I checked the backlash which seem to be ok. Even replaced them with spares.
    I checked the coupler set screws and re-tighten them.

    Too be honest in all my projects this is the first small circle I have done, so I never noticed the issue.
    It seems to be where the bit enters the circle to start the cut. I slow down the feed rate and plunge rate
    into the cut as well.

    Could this be one of the motors issue?

    Thanks.
     
  2. Gary Caruso

    Gary Caruso OpenBuilds Team
    Staff Member Moderator Builder

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    Hi Gazingm42,
    Picture? unless you are loosing steps it's not the motor, most likely it's the file or your sender not treating arc radius correctly.
    Are you making the file (drawing and cam) with vcarve?
    Post the code file (.cn or .cnc) with the small holes so we can take a look at it.
    Gary
     
  3. gazingm42

    gazingm42 Journeyman
    Builder

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    I drawing a 14mm circle in vcarve.

    G90
    G17
    G21
    G0Z1.000
    G0X0.000Y0.000
    M3 S12000
    G0X53.184Y65.175Z1.000
    G1Z-3.200F127.0
    G3X57.509Y69.500I0.000J4.325F381.0
    G3X53.184Y73.825I-4.325J0.000
    G3X48.859Y69.500I0.000J-4.325
    G3X53.184Y65.175I4.325J0.000
    G1Z-6.400F127.0
    G3X57.509Y69.500I0.000J4.325F381.0
    G3X53.184Y73.825I-4.325J0.000
    G3X48.859Y69.500I0.000J-4.325
    G3X53.184Y65.175I4.325J0.000
    G1Z-9.600F127.0
    G3X57.509Y69.500I0.000J4.325F381.0
    G3X53.184Y73.825I-4.325J0.000
    G3X48.859Y69.500I0.000J-4.325
    G3X53.184Y65.175I4.325J0.000
    G1Z-12.800F127.0
    G3X57.509Y69.500I0.000J4.325F381.0
    G3X53.184Y73.825I-4.325J0.000
    G3X48.859Y69.500I0.000J-4.325
    G3X53.184Y65.175I4.325J0.000
    G1Z-16.000F127.0
    G3X57.509Y69.500I0.000J4.325F381.0
    G3X53.184Y73.825I-4.325J0.000
    G3X48.859Y69.500I0.000J-4.325
    G3X53.184Y65.175I4.325J0.000
    G0Z1.000
    G0X86.812Y68.989
    G1Z-3.200F127.0
    G3X90.637Y65.164I3.825J0.000F381.0
    G3X94.462Y68.989I0.000J3.825
    G3X90.637Y72.814I-3.825J0.000
    G3X86.812Y68.989I0.000J-3.825
    G1Z-6.400F127.0
    G3X90.637Y65.164I3.825J0.000F381.0
    G3X94.462Y68.989I0.000J3.825
    G3X90.637Y72.814I-3.825J0.000
    G3X86.812Y68.989I0.000J-3.825
    G1Z-9.600F127.0
    G3X90.637Y65.164I3.825J0.000F381.0
    G3X94.462Y68.989I0.000J3.825
    G3X90.637Y72.814I-3.825J0.000
    G3X86.812Y68.989I0.000J-3.825
    G1Z-12.800F127.0
    G3X90.637Y65.164I3.825J0.000F381.0
    G3X94.462Y68.989I0.000J3.825
    G3X90.637Y72.814I-3.825J0.000
    G3X86.812Y68.989I0.000J-3.825
    G1Z-16.000F127.0
    G3X90.637Y65.164I3.825J0.000F381.0
    G3X94.462Y68.989I0.000J3.825
    G3X90.637Y72.814I-3.825J0.000
    G3X86.812Y68.989I0.000J-3.825
    G0Z1.000
    G0Z1.000
    G0X0.000Y0.000
    M30
     
  4. Gary Caruso

    Gary Caruso OpenBuilds Team
    Staff Member Moderator Builder

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    Circles look fine so it's something with the machine. Are steps being lost? could be current setting or loose connection to motor.

    upload_2019-2-17_19-57-15.png

    upload_2019-2-17_19-57-51.png
     
  5. Kevon Ritter

    Kevon Ritter Master
    Builder

    Joined:
    Apr 30, 2015
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    Which axis is the flat spot aligned with? You more than likely have backlash.
     

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