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I think a "clean Y rails" message is reported if the current being drawn by the y motor becomes relatively excessive. I agree, it is not a slip, but, an indication that it is having to work harder...

It looks to me like the bit was not cutting right just before it broke. Maybe plugged or somehow dulled. A mystery.

What exactly is the material you are carving? Did the bits plug up?

Have you checked the spindle for play? Does the bit seem to be held firmly by the machine? Does the bit wobble at all?
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Can you post a picture of the actual carving that broke the bit?

It is not easy to break the 1/16" carving bit. Something is wrong.



I assume you took off the roller scrapers and checked the rollers also. Does the carriage feel right when you manually move...

Are we talking 1/32" carving bits? Were you carving on optimal? What material are you carving? Do you have dust collection?

My guess would also be plastic chips sticking to the bottom y rails and...