Things seem to be moving along now. However, I’ve noticed an issue with the left flex coupler for the Z-axis. It stretches and pops during a full rotation, while the one on the right does not. After a full rotation, the coupler stretches and then snaps back.
The result is that the movement becomes slightly lopsided, and the issue worsens exponentially throughout the job. The coupler isn’t broken; it almost seems like it’s too tight.
Do you have any suggestions for fixing this issue?
Thanks rj
There’s only a few things I can think that would cause it, mainly that there’s binding with the leadscrew/nut interface. I would clean out the old lubricant and re-apply. This would also be a good time check that the screw isn’t bent, the coupler is tightened to the flat side of the motor shaft, and that the grub screws have new blue loc tite.
If you roll the leadscrew on a flat surface it’ll be pretty obvious that it’s bent.
I was able to get it fixed. Thank you
What did you find?
It helps the whole community to know what everyone has run into- because eventually someone else will or has run into the same thing.
Of course. I took apart the Linear Guides and cleaned them. One had some sawdust build-up that was causing stress on the coupler. That fixed the jumping. The only thing now is that the left side stepper motor controlling the z-axis drops when it loses power or I turn the CNC off while the other does not. So I just cut out a kickstand and reset the home location each use.