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Possible belt problem

Discussion in 'CNC Mills/Routers' started by Alan Estes, Sep 20, 2016.

  1. Alan Estes

    Alan Estes Well-Known
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    Am building a 1000x1500 machine, using the mechanical kit- Ox CNC Mechanical Kit - Large - Maker Store USA

    I didn't care for the way the belts are held in place, so decided to fix it.

    I mounted small L brackets on the extrusion ends, in line with them, then used two metal strips on the top and bottom of that, with the belt between the top strip and the bracket. Bolts on the ends of the strips squeeze it together.
    <Will post a picture tomorrow>

    When I tested the Y axis movement all I get now are short movements, maybe 1/2" and then it binds.

    Have no idea why what I did should cause this.

    Any ideas out there?
    Thanx, Alan
     
  2. Alan Estes

    Alan Estes Well-Known
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    Turns out it was not the belts but the motor wiring.
    I forgot that during that time I also decided to put my Y motors on a single controller and us the 4th one for a backup.
    Now, somehow those motors are spinning the correct direction but evidently coils are opposing each other.
    I can't think of anything else that it could be.
    Anyone know of a drawing for paralleling these 8 wire motors, with the reversing of one for Y?

    Thanx, Alan
     
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

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    if the wires on each motor are
    red + blue and yellow + green (each pair for a coil)
    then to get the 2 motors to run together connect
    motor1 and motor 2, red to red and blue to blue for the one coil
    for the other
    motor1 yellow to motor2 green
    motor 1 green to motor2 yellow.

    In general, to reverse a stepper motor you only have to reverse the wires on one of the coils. Any one.
     
    GrayUK and Mark Carew like this.
  4. Alan Estes

    Alan Estes Well-Known
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    Got it fixed and am now leveling my table frame (wood).
    Thanx Guys
     
    David the swarfer likes this.

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