2nd Post-Gantry goes out of square - Page 2


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Thread: 2nd Post-Gantry goes out of square

  1. #13
    Member vger's Avatar
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    Default Re: 2nd Post-Gantry goes out of square

    Try swapping the left and right connections to the y motors. If the problem of not moving on startup moves to the other side, the problem is in your drivers or wiring.



  2. #14
    Activation process justicedavid65's Avatar
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    Default Re: 2nd Post-Gantry goes out of square

    So, tonight I took the 2 Y motors off of the frame and put tape on the shafts. I ran a gcode project and they stayed in sync for a while, but then there was a long y axis run and that's where they got out of sync. Just prior to running this code I replaced the 2 y axis drivers with the x and z drivers because I know they were good.

    Does this point to one of these motors as the problem?



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    Default Re: 2nd Post-Gantry goes out of square

    Are you sure your gantry is rigid? Looks like it could use some bracing! If it's square before cutting and not after, then it would seem to me that the process of moving the gantry or z axis is pulling it off. Is your lead screw parallel and in the center of where it should be?



  4. #16
    Community Moderator ger21's Avatar
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    Default Re: 2nd Post-Gantry goes out of square

    So, tonight I took the 2 Y motors off of the frame and put tape on the shafts. I ran a gcode project and they stayed in sync for a while, but then there was a long y axis run and that's where they got out of sync
    Motors just lying on a bench are susceptible to resonance, which can cause lost steps or stalling, if it's bad enough. This may be what you are seeing.

    You might want to try some different microstep settings, and see if that makes a difference.

    Gerry

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


  5. #17
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    Default Re: 2nd Post-Gantry goes out of square

    @fretman - This is a design that is being used by several others and no issues with the gantry, so I don't think it's mechanical

    @ger21 - Today I connected both Y motors directly to the steppers, no splice at all between motor and stepper. I ran some code and the right motor fell out of sync. Then I switch drivers and the same motor fell out of sync. I don't see how it can be anything except the motor? No wiring issues and the same motor lost steps on different drivers.



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    Default Re: 2nd Post-Gantry goes out of square

    Are the main power cables for the drivers wired in a star configuration from the power supply or are they daisy-chained. Should be star configuration.



  7. #19
    Activation process justicedavid65's Avatar
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    Default Re: 2nd Post-Gantry goes out of square

    I have 2 48V power supplies. The mains feeds the first one and it feeds the 2nd one. Both of the Y motors are powered from the 2nd power supply, not daisy chained.



  8. #20
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    Default Re: 2nd Post-Gantry goes out of square

    Quote Originally Posted by justicedavid65 View Post
    @fretman - This is a design that is being used by several others and no issues with the gantry, so I don't think it's mechanical

    @ger21 - Today I connected both Y motors directly to the steppers, no splice at all between motor and stepper. I ran some code and the right motor fell out of sync. Then I switch drivers and the same motor fell out of sync. I don't see how it can be anything except the motor? No wiring issues and the same motor lost steps on different drivers.
    How do the drives connect to the motor? Do you think it could be the connection to the motor is bad? Have you also switched the suspect motor to a different axis to see if it loses steps? Sounds like you found the issue and now you just need to see if it's really a bad motor or maybe a bad connection.



  9. #21
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    Default Re: 2nd Post-Gantry goes out of square

    I kind of worked my way all the way down to motors connected to drives, with nothing in between. This is how I have come to think it's the motor that is the problem.



  10. #22
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    Default Re: 2nd Post-Gantry goes out of square

    Finally solved my problem. The problem was, I'm an idiot! I had my ground that daisy chains all of the drivers coming out of +5v instead of ground. All is well now and running great.

    So, all of you that said check the electronics were right!



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2nd Post-Gantry goes out of square

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