motor movements don't match dro


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Thread: motor movements don't match dro

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    Default motor movements don't match dro

    I am trying to replace the motors and electronics of my cnc. I have the motors, steppers and control board all wired up. The motors turn fine, but the digital readout doesn’t match the DRO. I am using a single start .5 inch acme screw to drive the z axis. It takes 10 turns to move the axis 1 inch. 10 turns times 200 full steps times 2 micro steps equals 4000 steps per inch. That is the number I entered under motor tuning in mach3. So when I turn the motor about one revolution, the digital readout should change by about .1 inch. However, it changes by about 5 inches. That is 50 times too much. How can I fix this?

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    Default Re: motor movements don't match dro

    Are your native units set to inches?
    Is Mach3 in Inch mode (G20)
    Are you sure the drives are set to 1/2 step?

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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    Default Re: motor movements don't match dro

    Quote Originally Posted by ger21 View Post
    Are your native units set to inches?
    Is Mach3 in Inch mode (G20)
    Are you sure the drives are set to 1/2 step?
    I set the units to inches and the dip switches are correctly set to half step. I was not running a program with a G20 command. I was just turning the motor shaft about one revolution with the jog key and I noticed that the numbers on the DRO changed by about 5 inches instead of .1 inch. So this is completely off. I have no idea what I am doing wrong. Perhaps the control board is defective. I just ordered another one. I have been using KCAM for many years. It always worked flawlessly. But it is getting difficult finding old computers to run KCAM. I wished there was another control software as simple and reliable as Kcam. I have not paid for Mach3 yet. And I am not going to until I see that it works.



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    Default Re: motor movements don't match dro

    Look at the status bar, and make sure it says G20.
    And go to Config > Native Units, and make sure it says inches.

    This is a configuration problem, not a Mach3 problem.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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    Default Re: motor movements don't match dro

    Thank you for your reply. The native units are definitely set to inches, but I don't see G20 on the status bar. How can I fix that?



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    Default Re: motor movements don't match dro

    Enter G20 in the MDI.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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motor movements don't match dro

motor movements don't match dro