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  1. #1
    Member Grascochon's Avatar
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    Default tune Glockcnc motor (1200w)

    Hey folks, I bought 2 Glockcnc motor upgrades (1200w) for my taig mill and lathe and it's driver is giving me problems. I can't tune and match the motor speed to my encoder readings with enough consistency across the scale. I emailed Jim at Glockcnc two weeks ago but he couldn't help me. So I'm hoping someone else has the same motors, maybe someone found a solution?

    Here is the problem:

    The cnc controller (acorn) speed control voltages (0-10v) values have been tested and are accurate

    Motor maximum speed is rated at 5400 rpm.
    I set the driver max speed to 5400 rpm

    the pulley diameter on the motors is 3.116, the pulley diameter on the spindle (with encoder) is 1.816, the gear ratio is 1.715

    5400 rpm of max speed on motor gives me a 9261 rpm max speed in Acorn
    So I set max spindle speed in Acorn to 9261, minimum speed to 0 rpm,

    I'm trying to match the commanded motor speed to the spindle encoder reading:

    run the test for different rpms:

    1k=840 rpm
    3k=2872
    5k=4940
    7k=7002
    8k=8065


    This shows me that these settings work well for 7k rpm, at 7k rpm the encoder matches the motor.
    below 7k the encoder value is below the commanded values, and the high range goes above

    Lets try to tune this a bit, so my 5k is better tuned:
    Change acorn maximum speed from 9261 rpm to 9000 rpm:

    1k=870
    3k=2968
    5k=5096
    7k=7230
    8k=8308

    the 5k is closer now, below 5k the values are under, above 5k the values are above.
    I need to get accurate rpms at 640 rpm so I can do rigid taping. If I lower the max speed I can get very close, but that lowers my maximum speed a lot and all values above 640rpm are exponentially higer, 8k becomes almost 10k



    Does this make sense? Does it show that I’m missing a bottom scale parameter somewhere hidden in the driver?
    The manual is very short and very badly translated and barely makes sense. I looked and tried every parameter, I did not find a setting that would act as a bias or gain.

    Anybody experienced this?

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    Default Re: tune Glockcnc motor (1200w)

    What control software Are you using?
    the speed curve need to be adjusted.
    I know Mach3, it is sort broken, the motor speed learning function...
    I found and post on Artsoft forum... a member made a excel spreadsheet macro to create and adjusted motor control file.
    You need to input various actual speeds vs input speeds..
    Then it has a generate button that would output the adjusted motor control data file..

    Good Luck,
    Stuart



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    Default Re: tune Glockcnc motor (1200w)

    Thanks Stuart,
    That would an Ideal solution,
    I'm using Acorn from centroid for the control sofware, it doesn't have that function, the 0-10v speed curve is set to linear and that's it.
    That's why I think there must be a bias or gain function in the motor driver to correct the speed curve angle. i can change the overall speed with the max speed parameter, and couldn't find a min speed parameter.



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    Default Re: tune Glockcnc motor (1200w)

    Well I am using a 750w GlockCNC unit..
    I was planning to use the motor control PID function in my Smoothstepper ESS.
    But the motor control has a PID control built-in...
    So they are in conflict with each other....So I was trying to bypass it in the setting ..No Luck!
    That is when I found the article for Mach3 motor control file....
    The search continues....

    Good Luck



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