2nd Post-Gantry goes out of square


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Thread: 2nd Post-Gantry goes out of square

  1. #1
    Activation process justicedavid65's Avatar
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    Default 2nd Post-Gantry goes out of square

    I started a thread a few days ago asking questions about my DIY machine and got some help. I'm down to just one issue plaguing me, so I wanted to start a new one.

    My machine is 1500mmx1500mm all 1610 ball screw and 15mm linear rails. C Beam on Y axis and dual C Beams on the X. My machine is square, measuring corner to corner both are the same. I can square my gantry by moving it to the front of the machine and touching both side to the front plates (I've attached a picture just so you can see what the design looks like). After squaring I can jog the gantry up and down the full length of the frame many times and everything is fine, but if I run a g code file, 'air cutting' the gantry will get out of square very quickly. I've tried circles and squares and both cause this.

    I can't tell which side is causing it, or if it's both sides? I can't hear or see any stalling or loosing steps.

    Any ideas? or troubleshooting techniques to figure this out?

    Thanks!

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

    Reduce acceleration and velocity 25%.
    If that doesn't help, reduce it again.

    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)


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

    Thanks, I've taken it all the way down to 400 vel and 50 accel and still get the same results?



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

    Are those number mm's?

    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)


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

    Oh, sorry. Yes mm.



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

    Just for a little more info, I am using 2 48V power supplies, 50V stepper drivers and 420oz motors with 9mh inductance.



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

    Do you have the current set properly on the drives?

    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)


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

    Well, I think I do. The motors are 3amp and here is the stepper that I'm using: DQ542MA-Stepping motor,stepper motor,driver supplier,stepper driver manufacturer,Stepper Motor,Drives,Driver

    I have them set to RMS 3.00/Peak 4.2, the highest available for the driver. someone in another thread suggested to check the amps coming out of the stepper, but I have no idea how to do that?

    Also, I have them set to full current and 1/8 microstepping.



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

    I don't know how to verify the current, but it sounds like it's setup correctly.

    Those accel and velocity numbers are pretty low, so the problem is probably something else.

    What control software is this?

    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)


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

    I'm using GRBL with a CNC XPRO board CNC xPRO V4 Controller - Spark Concepts

    And CNCJS software https://cnc.js.org/

    Thanks again for your in trying to solve this!



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

    I'm using GRBL with a CNC XPRO board CNC xPRO V4 Controller - Spark Concepts

    And CNCJS software https://cnc.js.org/

    And one more weird thing I have noticed the past few days. When I first start the machine the right side Y axis won't move. I have to move it manually a few turns, then it will start to move when I jog or run gcode? WEIRD.

    Thanks again for your help in trying to solve this!



  12. #12
    Community Moderator ger21's Avatar
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    Default Re: 2nd Post-Gantry goes out of square

    I don't know anything about GRBL, but I'd be inclined to look at your electronics or software settings.

    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)


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