What it is, is that I didn't have the bit very far up there, because using the 1/4" to 1/8" collet reducer, the thing is near impossible to hold in the reducer while simultaneously tightening the nut (which takes two hands in it's own right)...
So when the thing gummed up in the kerf it basically snapped..
I can't reduce the speed.. it's full on or full off.. A Super PID is on the shoopinf list next month..
Anyways, what I did, was to reduce the DOC to .025" and up the speed to 150 IPM... That got me through the job...
So now I don't have to do any more plastic this month, can buy a couple more bits next month, and keep this one as a spare....
By the time I have to cut any more plastic, I should have that S-PID controller, and even a 1/8" collet (now on the list too)..
Man, I was holding my breath when I hit go again....