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New CNC router is having a few problems that I can't figure out. Can you smart people teach me?

Discussion in 'CNC Mills/Routers' started by Rhu Evyk, Feb 23, 2019.

  1. Rhu Evyk

    Rhu Evyk New
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    I'm new to this and a bit lost. I just got and built a BobsCNC E3, I've meticulously checked and rechecked all of the assembly instructions to be confident the stepper motors and home switches are wired correctly. The two problems I have are:

    1: The home switch for the X-axis is functional but the software continues to move the router in the positive direction after it has been engaged. It should move in the negative direction during pull off.

    2: When using the jog controller inside of Universal Gcode Sender, the X+ and X- buttons both move the router in the X+ direction. Y-, Y+, Z- and Z+ all work properly

    I think the two issues are connected as the CNC router doesn't seem to move in the X- direction at all.

    I've disconnected the limit switches to remove them from the equation and cleared the alarm state in Universal Gcode Sender with the $X command. From there I use the Jog Controller to test the movement. X- still moves the motors in the X+ direction.
     
  2. Christian James

    Christian James Well-Known
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    Are you using grbl Rhu?
     
  3. Rhu Evyk

    Rhu Evyk New
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    Yes, sorry I forgot to state that.
     
  4. Christian James

    Christian James Well-Known
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    Its a while since I played with my settings but check your $3 setting - you may need to invert your X
     
  5. Rhu Evyk

    Rhu Evyk New
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    Just changed it to $3=1 it was set to 0 by default. X- button still moves X+
     
  6. Christian James

    Christian James Well-Known
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    In that case I would change it back for the moment. Only other thing I can think of is incorrect motor wiring - you will get some other suggestions from the forum hopefully.

    I forgot...you could try swapping the X and Z motor connectors and see if the fault goes to Z
     
  7. Rhu Evyk

    Rhu Evyk New
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    I have 2 X motors, 1 Y and 1 Z. I've tested X1 and X2 independently and they both have the fault.
     
  8. Christian James

    Christian James Well-Known
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    Ok but can the motor plugs be reversed? Disconnect power first!
     
    #8 Christian James, Feb 23, 2019
    Last edited: Feb 23, 2019
  9. Rob Taylor

    Rob Taylor Journeyman
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    Most obvious option: is the direction wire from the microcontroller pin all the way to the stepper drivers properly wired and testing for continuity? Is the X dir pin actually switching on the Arduino board (pin 5, I think , off the top of my head?)? If you change the drivers around, does the problem move?

    Double- and triple-checking the motor connections could also be worth a try; just one of the four wires being broken can also sometimes cause this behaviour.
     

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