Parting tool trouble

[Bustednuklz]

Thanks for all of the input. Many new things to try.
Nothing broken on the lathe, just had to restart it
I thought about flex, and even tried with a live centre as an experiment. Still chattered.
I had no intention of cutting all the way through with the centre, but thought it was worth a try.
I will check the cutter for taper, and make sure that it is square.
Never really had a chance to see if the lathe was slowing down, it shut down all together.
I will make sure that the carriage is locked.
Thanks again for all the advise
I will post my progress
Steve