If that happens, you probably shouldn't be using a lathe.
Very good video. Using carbide on an engine lathe may or may not work depending on the mass and rigidity of your lathe. Generally speaking carbide is made for CNC lathes and mills that will smoke a HS tool in a few seconds. Carbide, generally speaking, relies on pressure and rpm/surface feed to cut. High rpm cuts down on tool pressure which in turn cuts down on the rigidity needed for a chatter free cut. It really is that simple. It can be made to work on an engine lathe, but you need the most rigid set-up you can come up with and higher rpm's carbide is designed to run at. I personally run the sharpest HS threading insert I can find in my engine lathe. If I were to try carbide, and had troubles, I would try running the tool upside down and crank up the rpm's. My chucks have cam locks. Common sense would dictate not doing this with a screw on chuck!! Good luck and happy threading.
Paul