Z axis gone bad

This topic contains 11 replies, has 7 voices, and was last updated by  Bill 7 months ago.

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  • #29716

    Dalton Porter
    Participant

    Hi, I’ve had the cnc up for about a week – got the kits here. It seemed to work fine, but something has gone south though.
    My zaxis seems to sometimes work, othertimes not. I took the stepper off and I’m just running it using manual mode in repetier. For a few minutes it will appear to work, then it starts making grinding noises, runs opposite direction, then will just stop accepting commands. I can turn it off for a while and it seems to “cool down” then I can get a few more commands in. It seems to not like the 1mm steps. (grinding sound) The 10mm steps run smoother – but sometimes in the wrong direction.
    I’ve been through the basic software setup on this web site. I’ve even made some carves, but now I’m stuck on this z-axis issue.

    My question is how to debug this? Is it the electronics, the software, the stepper?
    X/Y seem ok.

    #29722

    Dalton Porter
    Participant

    Update: I (unplugged everything) switched the Y and Z drivers. The problem seems to stay with the stepper.
    Its strange, a lot of the time it works fine, but it gets into fits where it rumbles or goes the wrong way.

    It sure feels like a bad connection in the wiring – the way it comes and goes. Is it possible to take the cover off the stepper and verify the connections inside?

    #29723

    Ryan
    Keymaster

    now swap the wires, does it follow the wires or the stepper.

    #29724

    Dalton Porter
    Participant

    Do you mean unplug the wires from the stepper? They don’t appear to be on a connector.

    #29725

    Ryan
    Keymaster

    The wiring harness.

    It can be the stepper, the harness, the driver, ramps, arduino, or control system.

    #29727

    Dalton Porter
    Participant

    I took your suggestion and was going to switch out the wiring harness when I noticed the harness was slightly loose!
    I had covered the joint with black electrical tape, and the entire length in PET, but it must have worked loose.
    I re-did the tape and it worked great!
    Is there a better way to make this connection stay together other than black tape? The connectors seem inherently loose.

    Thanks for all your help.

    #29728

    Ryan
    Keymaster

    I use black tape as well. You can slide the female pins out pretty easy and give them a pinch if you think they are making poor contact.

    #29729

    Jim Hildebrandt
    Participant

    I’ve done this on RC airplanes to keep connectors together.plug

    #29844

    I used on my joints of wires, thermo tubes (sorry don´t know whats the name on english). Its better than Black tape.

    Its like this:
    Thermo tube

    #29850

    Zeenon
    Participant

    Heat shrink tubing.

    #29853

    Neil
    Participant

    I love the small zip tie idea! Thanks for the pic! I had the same issue just a slightly different problem (my wire was shorted or faulty somewhere within the sleeve ‘thanks banggood’).

    Neil

    #29868

    Bill
    Participant

    I’ve had a couple of issues with connectors not holding when shrinkwrapped… I think I’ll redo with zip ties and shrinkwrap. 😉

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