So I am making a collar to go around the depth indicator for the quill on my bridgeport to attach the read head for a quill DRO. Had the collar almost done, hole bored to exactly 1.502" to match the depth indicator, through hole for the screw, measured to trim it down so it will clear everything and go to make the final cut. At this point I should have stopped and went to have said beer. But I didn't. Proceeded to set up to make the cut but neglected to lock the quill. Guess what happened? The end mill fed down and got deeper and deeper. One ruined part. Still didn't learn my lesson and call it a night. Got a piece of aluminum bar to cut off a piece and start over. Just into the cut and the bandsaw blade broke. Finally learned my lesson and gave up for the night.