I was using my lathe with a large piece yesterday and had the lathe set to its slowest speed, the smallest gear on the bottom cone of gears. After a bit it suddenly got really noisy and when I checked the gears, on what appeared to be a solid gear cone, the smallest gear had moved to the left and was rubbing the housing. I loosened the belt and found I could push it back into the cone. I repositioned the belt, but it immediately did it again. Checking it out, the belt seemed fine, with the exception of a 2 inch area, where the grooves on the belt were missing on only one groove. The other grooves were fine. I don't know if that is pulling the gear out or perhaps was caused by the gear pulling over?? Any ideas how to fix this? Karen Rice