Brake Drums, because of their dish or bell like shape, have a tendency to chatter. This can result in a wavy or chatter finish. The noise, too, is very objectionable. Chatter can be controlled by being assured that the vibration dampener supplied is securely wrapped around the outside of the brake drum. THE VIBRATION DAMPENER BELT MUST BE USED AT ALL TIMES.
Next in order is chatter due to dull, broken, chipped or improper tool bits. Always use tool bits supplied by the original manufacturer, as they are designed to do a specific job. Using a Negative Rake tool bit on a machine that is made for Positive Rake bits can cause chatter and poor quality finish. All Kwik-Way Brake Lathes require Positive Rake Bits. Mount them with the "pointy" side up.
Carbide tip being loose on shank will also cause chatter. It is IMPORTANT that the screw holding carbide bits actually holds the tip firmly.
When either rotating or replacing carbide tips, it is important to have a clean flat surface for the tip, otherwise the carbide tip will crack or cause chatter.
Positive Rake vs Negative Rake Brake Lathe Bits