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  1. #1
    Join Date
    Oct 2005
    Posts
    29

    Running at Half Scale

    I've set up everything to spec, I think, But I seem to be running at half scale.
    My numbers in mach are correct, but my router is running at what it appears about half scale. What am I doing wrong?

  2. #2
    Join Date
    Mar 2003
    Posts
    35538
    Your'e steps per unit are probably double what they should be
    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
    Oct 2005
    Posts
    29
    I've double checked everything and the motors and drives are set correctly.2000 steps, 1.8 degree motors. I bought everything as a package from
    Automation Direct, so I know everything should work together. The scale is set at 1 on the DRO's. When I manual input values, say as inputting 1 inch I'll get only about .200 so I'm about 1/5th what I should be at. My lead screws are 5 TPI. I can set my drives up to 10000 steps. I reset my drives to 1000 steps and no change.

  4. #4
    Join Date
    Apr 2006
    Posts
    3498
    are u at 1/2 step mode? or full step..i/8????// check it

  5. #5
    Join Date
    Mar 2003
    Posts
    35538
    Your steps per unit in Mach should be 10,000 if I understand you correctly.
    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)

  6. #6
    Join Date
    Jun 2007
    Posts
    3735

    Smile Save the Axis.

    In Mach3 motor tuning, when you change anything, you have to hit the big SAVE SETTINGS for AXIS button, for EACH AXIS as you do it.
    Just hitting the OK button leaves the screen and the changes become lost intentions! This help prevent inadvertent stuffing up of the calibration.
    Enter the new steps number, Hit the TAB key, then the SAVE key and exit and see if new changes work. You don't need to exit and restart Mach3, but you may need to hit the RED reset button, then see what your calibration looks like. As Khalid says you need the step mode (switches or links on your stepper driver module) set correctly. If you change the steps per unit by a factor of 2, save and the observe what happens.
    Do one axis at a time so as not to confuse the human side of the equation.
    Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.

  7. #7
    Join Date
    Oct 2005
    Posts
    29
    Thanks for all the help guys. I set my motors correctly and everything is running great. I type in an inch and the axis moves exactly 1 inch.

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