Z axis start / stop Jerking?

Comments

• 156801

  May 2018

  Hi,

  new to 3d printing and worked my way through a few problem but have come across a new one. 

  
  

  All of a sudden both z motors have started to stop and start. This can happen when moving up or down.

  
  

  I would not say they are jerking as you can see in the video they stop and start both motors at the same time and there is a clunking noise. Happens when disconnected or connected to a laptop. Tried reloading old firmware with no luck. 

  
  

  When both motors are stationary they made a slight grinding noise and if you turn the rods with power on they feel different to turning the x axis.

  
  

  Video link https://drive.google.com/open?id=1DkOPEtmC8jT_nuRyNotVcmgPNVXEIaVp

  
  

  Printer is a Geeetech I3 Pro B W with GT2560 board.

  
  

  Any thought would be great full.

  
  

  Robert
• Repetier

  May 2018

  What do I see in video? Several z moves so I can hear the clonk?
  I woudl try reducing z acceleration to 50 and setting z jerk to 0.1. What you hear is the shock at accelerating from no move so being smoother here should reduce the sound.
• Repetier

  May 2018

  You only need to change values in eeprom!
• 156801

  June 2018

  I tried adjusting z acceleration and jerk but it did not work. I ended up adjusting the voltage on the driver and so far so good.
  
  I keep the z adjustment hoping for a better print quality.