Auto Home Crash ( X-Axis)

Discussion in 'Calibration, Help, and Troubleshooting' started by Werk, Aug 25, 2016.

  1. Werk

    Werk Member

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    Hi, I ran into a problem when running the Auto Home program.

    The printer head triggers the x and y stops okay, then the bed lifts to the correct level below the nozzle.

    Here's where we have a problem, the head moves across the central point and proceeds to crash into the right hand side (nasty shutter sound as the motors continue to pull).

    Image attached of the final resting place after the crash.
     

    Attached Files:

  2. tohara

    tohara Well-Known Member

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    It is hard to tell from the picture, but the X-axis stepper motor looks small. Are you sure you got the correct motors on correct place?
    Z-axis stepper motors is 1.8 deg motors and the rest is 0.9 deg motors.
     
  3. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    Hi Werk,

    Just a double-check on the order in which things happen. On my machine, using the RC6 firmware (the code should be displayed somewhere on the LCD when you turn the machine on) I think the autohome sequence works in this order (I'm using a different setup at the moment so can't double check):

    The Autohome sequence moves the head towards you until the y-axis end stop touches (it will do this a couple of times). Then the head moves left until the x-stop touches (again a couple of times). Then, I think , the head moves to the centre of the bed (the IR sensor to the centre, not the nozzle(s)) then the z-axis moves up to the correct position.

    If the head is moving across the bed to the far right hand side, I would check a few things. Firstly, check you have the correct steps per mm for each axis. You can find these settings under Control>Motion> menu.

    Secondly, check that you have the axes correctly connected. You can do this by using the Prepare>move axis menu item. If you use the 0.1mm movement, you should be able to see which axes are moving and in which direction. Note you may not be able to move the axis to a negative position depending upon your settings.

    There's a video somewhere that shows the Autohoming sequence but I can't find it at the moment.

    Good luck,


    Jason
     
  4. Werk

    Werk Member

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    Thanks Tohara, it's a 1.8 deg motor on the X-axis alright. Nice pick up!

    Will also try see what happens with the adjusted config, cheers Jason.

    I did have a look at the video, and the behaviour matched for the most part.
     
  5. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    Hello again,
    I've found a video, it's describing a problem with homing but it shows the sequence from about 1:00:



    (the Issue Richard was having was (I think) that the z-offset and IR sensor needed adjustment)
     
  6. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    Aha! That would do it!
     

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