Jogging issues.


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    Default Jogging issues.

    A newbie jogging question, with Mach 4 and UC100 motion controller.

    With Mach 4 incremental jogging set at 0.0010 successive clicks of the X+ button produce the following DRO readings:

    .6222
    .6241
    .6232
    .6251
    .6242 and so on.

    This happens with X, Y, and Z sometimes with bigger jumps.

    I am thinking this is a settings issue but not sure what.

    Similar Threads:
    Last edited by davec243; 12-23-2017 at 10:18 AM. Reason: typo


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    Default Re: Jogging issues.

    What are your steps/ unit set to. If you're steps/unit don't divide evenly into .001 increments, then you can't jog in .001" increments.

    Gerry

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    Default Re: Jogging issues.

    Steps per unit is set to 16256 with a 1605 metric ball screw. 10,000 might be better?



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    Default Re: Jogging issues.

    10,000 didn't help. Might have to understand the math better.



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    Default Re: Jogging issues.

    Steps/unit are dictated by your hardware, and microstepping amount. You can't arbitrarily change them.

    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: Jogging issues.

    According to this math:

    The formula for the motor tuning is as such:

    5mm pitch ballscrew (common on georges machines)
    5mm travel per turn of the ballscrew
    Converted to inch = 5.08 turns per inch of travel
    Driver Microstep resolution = 4000ppr

    4000 X 5.08 = 20320

    I should be at 16256 (microstep setting on MX 4660 is 1/16=3200), which is where I was.

    I am not sure why it does the "two steps forward and one step back" thing.




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    Default Re: Jogging issues.

    Post your drive motors model, Breakout board model, You cant just set things up which is not supported on your current set-up, custom setting it above or below your hardware`s capabilities will result to an offsetting issues on either of your drives, a pain in the ass for short



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    Default Re: Jogging issues.

    Motors are Leadshine HS23B30A, with Leadshine driver MX4660, with dip switches set to 1/16 - 3200 steps per revolution, Mach 4, UC100 motion controller converting my USB cable to the 25 pin connector on the MX 4660.

    I think the 16256 steps per inch is right.

    Just not sure why it goes +X then -X when I am pressing the X+ button both times (see consecutive list of DRO readings above)..



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    Default Re: Jogging issues.

    On your scenario I think it`s an acceleration issue, (axis doing backflips) try adjusting the acceleration on the ports and pins to eliminate it.



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    Default Re: Jogging issues.

    Thanks, I'll try that after I shovel my driveway.



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    Default Re: Jogging issues.

    I tried cutting the acceleration from 30 to 20 and it did not seem to help. I am wondering if it is a shielding issues. My motor wires are not shielded. Today (as on other occasions) jogging the Z axis .001 results in the X axis moving as well. It takes 2 clicks of the mouse to jog .001. The X axis would move .006 on one click and go back on the next - this was when jogging Z. It doesn't seem like it should do that.



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Jogging issues.

Jogging issues.