Hello. I have installed all hardware and did the first power up. Upon turning on the power button the Z axis did some homing as expected, no problem. Then the tilt motor started to grind so I powered it off immediately. There are no screws, plates or interfering parts. The shaft is aligned with the bracket. The shaft is screwed in completely to the bracket. It appears that the tilt motor shaft is forcing the hook to bottom out. It is even flexing the tilt motor mount plate a little. If I remove the hook, the tilt motor shaft will go up and come down. Successive power on and off without the hook and the tilt motor shaft gets higher each time. I have re-applied the latest firmware again, still same problem. All the electronics are hooked up correctly, checked and rechecked. Another thread said this noise is normal. Grinding in any machine is never normal or good. Something is wrong. Could the tilt motor be bad? How does it know where “home” is? Is there a hall effect sensor or shaft encoder used in this little motor? Does it have current sensing circuit to stop it when it senses the hook against the bottom of the slot? Is there a setting that determines the distance the shaft travels?
Video of grinding
Video of tilt motor with hook removed
As a recommendation to engineering. It would be a better design to mount the bearings to the chassis and use shaft collars screwed to the frame of the tilt platform. This would allow simple positioning to align tilt motor shaft to the bracket. Wherever my tilt platform sub-assembly was assembled, they stripped 3 out of 4 set screws in the bearings. After continued vibrations they will move laterally or induce slop into the precision of the printer. Bearing set screws are never used to keep parts in place on a shaft. Set screws in shaft collars should be used. A keyed shaft would work quite nicely as well and eliminate a few parts. Thanks for any assistance.