first axis runs fine, second axis grinds

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This topic contains 9 replies, has 4 voices, and was last updated by  Barry 6 days, 10 hours ago.

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  • #100110

    Edward
    Participant

    Hi all,

    I had a Rambo running my machine and it started acting odd (seemed like the X axis was not working) I thought I fried a driver on it so I reflashed it with MM3DP software and wired it up on my  MP3DPand it works fine. I replaced the Rambo with a RAMPS I had lying around on the MPCNC  and ran some tests. No matter what axis I move first, it runs fine. The second axis I run rumbles and grinds like the motors are missing steps or turning opposite each other( they are not, I checked and double checked). The video give you an idea of what I am refering too. I moved the X axis, then the Y axis( grind, rumble) then the Z axis( grind, rumble).

    https://drive.google.com/drive/u/0/folders/1JbrNJ5m5dL2vav2YBLYpCmsiVHBvVfbz

    #100116

    Ryan
    Keymaster

    Sounds like the series wiring is not correct. Your video is private so I am just guessing.

    #100123

    Edward
    Participant

    Can you elaborate on the series wiring? I am using all 5 stepper drivers on the RAMPS  board as shown on your website. I dont understand why the second axis always grinds. try this link for the video.

    https://drive.google.com/file/d/1LcUFjQtLkyt297UbobpRzXKUdQV7Q6oC/view?usp=sharing

    #100188

    BT
    Participant

    Series wiring the steppers gives you the same current through each stepper in lieu of the steppers sharing the current in a parallel arrangement.  See https://www.v1engineering.com/assembly/wiring-the-steppers/ for what this looks like.

    #100196

    Barry
    Participant

    Yep, one of the 4 stepper wires isn’t making contact.

    #100199

    Edward
    Participant

    I dont have the steppers wired in series. I have them connected like this picture. Even so, why does the first axis I move behave normally and the second one (and the Z axis) always falter? It does not matter which one I move first, X, Y, or Z.

    https://www.v1engineering.com/wp-content/uploads/2017/11/Ramps.jpg

    #100203

    Barry
    Participant

    Are you running the dual endstop firmware?

    #100206

    Edward
    Participant

    Yes, I re-downloaded it off Github and reflashed it to make sure I had the latest and greatest

    #100219

    Edward
    Participant

    I might have solved it. I had an old desktop power supply running the machine. I checked the voltage and it was only about 9.5 volts feeding the board. I changed it out to a different power supply(12 volts) and it is behaving normally again. I haven’t had a change to test it under load yet but so far so good. Do you think that would make it act so erratically?

    • This reply was modified 6 days, 15 hours ago by  Edward.
    #100242

    Barry
    Participant

    Yep.  I was going to mention power, but got sidetracked.

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