RE: Reason for Core One rumbling found (?)
I want to add to this discussion with my observations related to excessive Z-axis vibration.
Z axis vibration is present regardless of motor speed and seems to be transmitted through the rear and right side z-axis threaded rods. The vibration is worse the faster the z-axis motors operation. The right side z-axis rod experiences severe vibration that results in noticeable wobble towards the bottom of the printer.
I have tried to eliminate possible alignment issues by loosing the z-motor mounting screws, the screws mounting the trapezoidal nuts, and the trapezoidal nut to hotbed mounting brackets, and then running the bed up and down to center the moving parts. When cycling the bed up and down with all these screws loose, there is very little vibrational noise. I then slowly tightened the screws while continuing to cycle the bed up and down a total of about 10 up and down cycles. there was little to no improvement when done.
During this sequence, I noticed that the vibration could be very effectively dampened by applying a slight centering pressure on the top of the right side z-axis threaded rod.
I also noted that with the bed at the bottom, the top of both z-axis threaded rods were making contact with the front of the provide holes under the carriage. With the bed at the top of the printer the threaded rods were in contact with the back side of the same holes. To me that indicates parallelism of the bed changes across the full range of the beds vertical travel. Possible because the back z-axis is moving at a different rate or the motor is slipping. This could certainly be causing the vibration. I have tried to resolve this but have not yet been successful.
RE: Reason for Core One rumbling found (?)
I want to add to this discussion with my observations related to excessive Z-axis vibration.
Z axis vibration is present regardless of motor speed and seems to be transmitted through the rear and right side z-axis threaded rods. The vibration is worse the faster the z-axis motors operation. The right side z-axis rod experiences severe vibration that results in noticeable wobble towards the bottom of the printer.
I have tried to eliminate possible alignment issues by loosing the z-motor mounting screws, the screws mounting the trapezoidal nuts, and the trapezoidal nut to hotbed mounting brackets, and then running the bed up and down to center the moving parts. When cycling the bed up and down with all these screws loose, there is very little vibrational noise. I then slowly tightened the screws while continuing to cycle the bed up and down a total of about 10 up and down cycles. there was little to no improvement when done.
During this sequence, I noticed that the vibration could be very effectively dampened by applying a slight centering pressure on the top of the right side z-axis threaded rod.
I also noted that with the bed at the bottom, the top of both z-axis threaded rods were making contact with the front of the provide holes under the carriage. With the bed at the top of the printer the threaded rods were in contact with the back side of the same holes. To me that indicates parallelism of the bed changes across the full range of the beds vertical travel. Possible because the back z-axis is moving at a different rate or the motor is slipping. This could certainly be causing the vibration. I have tried to resolve this but have not yet been successful.
RE: Reason for Core One rumbling found (?)
I want to add to this discussion with my observations related to excessive Z-axis vibration.
Z axis vibration is present regardless of motor speed and seems to be transmitted through the rear and right side z-axis threaded rods. The vibration is worse the faster the z-axis motors operation. The right side z-axis rod experiences severe vibration that results in noticeable wobble towards the bottom of the printer.
I have tried to eliminate possible alignment issues by loosing the z-motor mounting screws, the screws mounting the trapezoidal nuts, and the trapezoidal nut to hotbed mounting brackets, and then running the bed up and down to center the moving parts. When cycling the bed up and down with all these screws loose, there is very little vibrational noise. I then slowly tightened the screws while continuing to cycle the bed up and down a total of about 10 up and down cycles. there was little to no improvement when done.
During this sequence, I noticed that the vibration could be very effectively dampened by applying a slight centering pressure on the top of the right side z-axis threaded rod.
I also noted that with the bed at the bottom, the top of both z-axis threaded rods were making contact with the front of the provide holes under the carriage. With the bed at the top of the printer the threaded rods were in contact with the back side of the same holes. To me that indicates parallelism of the bed changes across the full range of the beds vertical travel. Possible because the back z-axis is moving at a different rate or the motor is slipping. This could certainly be causing the vibration. I have tried to resolve this but have not yet been successful.