I used the laser several hours today, everything was fine but, then it started having problems with the y-axis.
It works fine when it's back, within 30 mm or so of the x-axis. When it moves further forward than that, the y-axis starts jittering and stops moving, losing steps. I can move the belt by hand and it feels normal.
If I move the x-axis another 100 mm or so further, the y-axis starts working again.
There's nothing on the belt or interfering with the motor gears.
There appears to be an area between 30 and 130 mm off the x-axis where the y-axis does not step correctly.
When I move the x-axis front to back, there is a pop sound that appears to be at the limit between the area where it does work OK and where it doesn't. It's consistent over several trials.
The move speed is set at 80 mm/s. I've tried resetting the controller and power cycling the system and the problem persists.
Any suggestions on where to look next?