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IndustryArena Forum > CAM Software > Vectric > PhotoVCarve and VCarve Pro > Importing a Photovcarve image into Mach3 mill program sizing issue
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  1. #1
    Join Date
    Jul 2012
    Posts
    3

    Importing a Photovcarve image into Mach3 mill program sizing issue

    I am a first time user of Photovcarve. I have an issue with use a prepared Photovcarve image in a Mach3mill program. It seems to cause an oversized run that I have set up. For instance I prepared a 6 x 4 in photo in Photovcarve ( converted to MM ) than exported it in both the mach3 compatable G code Txt file and standard G code file. I than open ether file in Mach3 Mill program, do a test run, and it seems to over size that image by several MM. Mach3 is set up for MM. This happens ether with the Mach3 txt file or the Standard G code file that I have set up. I have looked at the code lines at the start and it does reflect the right size of the image I had setup in the beginning. Any help or suggestions?

  2. #2
    Join Date
    Mar 2003
    Posts
    35538
    Sounds like your steps per unit settings in Mach3 are off slightly. How much size difference are yuo seeing?
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  3. #3
    Join Date
    Jul 2012
    Posts
    3
    Roughly about a inch and a half. On the steps per unit suggestion. I am not quit clear on setting that up. Any hints?

  4. #4
    Join Date
    Mar 2003
    Posts
    35538
    It's usually the first thing that you set up in Mach3 after you get the motors moving. You need to make sure the machine moves one inch when you tell it to move one inch.
    There's a built in utility on the Settings page to help you, right above the Reset button.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  5. #5
    Join Date
    Jan 2006
    Posts
    738
    If you had told Mach3 that your microstepping was 5 when the stepper driver was set on 4, this would give you a 7.5 inch machine movement when commanded 6 inch.

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