I don’t even know how to describe what happened, so here’s a picture. I’m making beer flight paddles, and have done about 10 of them successfully, and then this happened right at the end of the job.
The 1/4" bit bored as far as possible down into the spoil board, and then was ripped out of the collet.
I made no changes to the post processing file that I used on previous jobs, so I have no idea what happened. Any ideas?