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Z motor only working properly close to home position

Discussion in 'OpenBuilds Forum Help' started by warth, Oct 18, 2023.

  1. warth

    warth New
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    Hello,

    I have a lead 1010, worked ok for a while but the last time I ran a job, the tool plunged in way to much towards the end of the job.
    Since then I noticed the z axis is only working properly close to home position. If i go further than 300mm in X and Y from home Z goes to hell.
    Any ideas?

    Thanks!
     
  2. Giarc

    Giarc OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    Have you checked your wiring to see if maybe there is a loose connection or a short? Maybe when the wire is bent in a position other than how it is at the "home" position it causes a short making the motor behave erratically.
     
  3. warth

    warth New
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    I checked the wiring, looks ok.
    20231019_094112.jpg 20231019_094123.jpg
     
  4. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    so you are saying that when the tool is moved 'far' away from home, Z acts weirdly. (knwoing exactyl what it does would help us analyse....)
    I see cable chains in your pictures.
    The Z cable is in that cable chain, maybe 2 of them.
    I think we can conclude that the motion of the cable in the cable chain, or near the ends where it flexes, might just be the problem.
    I would disconnect the Z cable from the blackbox (power off! ) and from the Z motor, connect a torch bulb so it is powered through that wire (1), then jog the machine around and see if the torch bulb flickers at all.
    I would do this using 2 pairs at a time, so 2 tests to check all 4 motor wires.

    (1) to do this I would put a jumper across 2 wires at the motor end then wire the torch battery and bulb to the other end, feeding throguh those same 2 wires. now the torch should be on all the time unless there is a problem with a wire as it flexes, jogging the machine around will flex the wires for us.
     
  5. warth

    warth New
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    Hello David,

    Thanks for your reply.

    Yes, 2 cables in the chain, z motor and z switch.
    4 cables in the chain to the side of the machine.
    I opened the chain with the 4 cables and looked at the z cable.
    I see lumps in it and when I move it by hand a little I hear the motor clicking like when I
    power up.
    I' ll find a new cable and replace it.
    Will let you know how it goes.
     
    David the swarfer likes this.
  6. warth

    warth New
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    Eureka!
    It's working again.
    I cut the cable after the lump and wired it to the motor, I had extra length on this one.

    Thank you both for the much appreciated help!
     

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