If you are machining work held between lathe centers, and the lathe centers begin to squeal, you should first __________.

Correct Answer: Option C — stop the lathe

Squealing indicates metal-to-metal contact and friction-induced heat, which can quickly ruin the center or the workpiece. Immediate cessation of rotation is required to prevent seizing or permanent damage to the lathe centers and the part being machined. Safety protocols prioritize stopping the machine to investigate the cause of the friction.