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Thread: Problem Z Axes

  1. #1
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    Problem Z Axes

    Hello,

    Sorry for my bad english, i wish you will understand and help me.

    I have a new problem with the Z axis.

    When I try to move the Z axis with Cura or Repetier, the move is not smooth and sometimes one of the steppers stop and the other continue.
    It seems the motors force to move.

    I have verify the screws on the steppers and the problem continue.

    I have unscrew the 2 Z Axis Top Bracket, and the problem don't continue (for the moment) but they are not fixed on the top.
    the hole on the z axis bracket and on the main frame don't match exactly. There is a difference of around 3 mm.
    Perhaps this difference is enough to block the stepper.

    I have also a problem with the bed, it is not straight so i will try to put a glass on the print bed and i will let you know if it works.

  2. #2
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    Quote Originally Posted by SAO View Post
    I have also a problem with the bed, it is not straight so i will try to put a glass on the print bed and i will let you know if it works.
    Try to calibrate the Height of each side on the X-wing (the horizontal platform on which the extruder is placed). You can do this by following a guide i made: http://www.print3dforum.com/showthre...p-the-Hardware

    I think this will help you on the right track. When these are not aligned, the force required to move each motor is increased, and may lead to what your experiencing.

  3. #3
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    Hi Sao,

    Take some pictures of the stepper motors and top brackets and post them here, maybe we can spot a problem?

    Hint: Use the Advance editor function to insert images for your posts.

  4. #4
    Administrator bolsoncerrado's Avatar
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    If you turn off your printer you can freely move the motors and even use a bubble level to get the propper arrangement.

  5. #5
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    Quote Originally Posted by JonatanJacobsson View Post
    Try to calibrate the Height of each side on the X-wing (the horizontal platform on which the extruder is placed). You can do this by following a guide i made: http://www.print3dforum.com/showthre...p-the-Hardware

    I think this will help you on the right track. When these are not aligned, the force required to move each motor is increased, and may lead to what your experiencing.


    Thanks for your answer.
    The first thing i have done to calibrate Z, was to use the calibrating cube we had to have the same distance on the 2 sides but even with the same distance, the motors turn manually with difficulty.

    Now I have unscrew the 2 Z Axis Top Bracket, It move more easyly.

  6. #6
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    Hi Sao
    Also check the distance to the frame legs on both sides to verify that its equal, else it will increase the required force.

  7. #7
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    Quote Originally Posted by lawong View Post
    Hi Sao,

    Take some pictures of the stepper motors and top brackets and post them here, maybe we can spot a problem?

    Hint: Use the Advance editor function to insert images for your posts.
    Thanks for your answer

    There the photos :
    The first side :
    20141223_222520_resized_1.jpg

    The bed :
    20141223_222218_resized_1.jpg

    The front holes of the z axis top bracket :
    i could push the axis but these 2-3 mm make the motors force
    20141223_222157_resized.jpg

    Zoom on the first stepper :
    20141223_222530_resized_1.jpg

    The second stepper :
    20141223_222550_resized_1.jpg

    The second side :
    20141223_222607_resized_1.jpg

    The top :
    20141223_222619_resized_1.jpg

    If you see something wrong tell me.
    Thank you

  8. #8
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    I had the same problem, took a lot trying.
    Use the blocks see picture:
    2014-12-23 20.10.16.jpg

  9. #9
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    Quote Originally Posted by Jan Pettersson View Post
    I had the same problem, took a lot trying.
    Use the blocks see picture:
    2014-12-23 20.10.16.jpg
    Thanks for your answer.

    Since de beginning, I used these blocks to have the same height on the 2 sides.
    But the fact to force on the top in order to screw the Z axis bracket, stopped one side and not the other.
    So I unscrew the top bracket (only in one side), and now (for the moment) it works, what is the most important.
    If i found where those 2-3 mm come from, i will post it.
    Thanks

    Could you please post a photo of the other side, to see if you have a little space between the main frame and the base ?
    Last edited by SAO; 12-24-2014 at 12:35 AM. Reason: add a question

  10. #10
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    I had a similar problem on first assembly. I had to remove the Z-motor housings and rescrew them in, so that they matched up better with each other. I screwed the front screws in first and then the sides, which made them line up better. There should be almost zero difficulty in screwing in the both the z-motor and top bracket screws if you have the bottom two z-motor housings lined up well.

    With mine there is about 1mm of distance between the bottom of the Z-motor housing and the base. It should be equal on both sides.

    Did you tighten the set screw on the Z-motors to the screw?
    Last edited by clayton; 12-24-2014 at 01:53 AM.

 

 

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