Which of the following is a common indicator of the need for maintenance on a lathe?

A common indicator of the need for maintenance on a lathe is the presence of excessive noise. Noise can indicate various mechanical problems, such as worn bearings, misalignment, or inadequate lubrication. These issues can lead to breakdowns or damaged components if not addressed promptly. Excessive noise often serves as a warning sign that the lathe requires inspection and potential maintenance to ensure safe and efficient operation.

While partial clogging of grease fittings, worn cutting edges, and run out on work holding devices can all signify issues that may need attention, they may not directly correlate with the overall mechanical condition of the lathe in the same immediate and alarming manner as excessive noise. Each of these factors can also be part of regular maintenance checks, but excessive noise tends to stand out as a clear and urgent indicator that something in the lathe's operation is not functioning correctly and could affect performance or safety.