Problem: A Cox 15 replacement cylinder, than needs fins.
I machined an itty bitty cutoff tool, about 50 mils wide and 300 mils deep. It chattered. I gritted my teeth and kept feeding. It bound up, wrenched the cylinder out of the chuck, and broke.
Fortunately the part looks to be recoverable, assuming that I can finesse the spot where the chunks of tool dug into the steel.
But I still need to turn in those damn grooves between the fins.
Any pointers, or should I just make a new tool, do the same stupid thing, and see if the laws of physics have changed since November? I _did_ make sure that things were as rigid as possible, with the exception that I probably had the cylinder sticking too far out of the chuck, out of paranoia about hitting the jaws with the tool holder.