Which method is used for lubricating the ways of a lathe?

The correct answer is the method of using lubricant from central lubricating systems. Central lubricating systems are designed to provide a consistent and controlled application of lubricant to various parts of a machine, including the ways of a lathe. This method ensures that the lubrication reaches all necessary areas effectively, which is vital for maintaining smooth operation, reducing friction, and preventing wear over time.

Central lubrication systems can be automatic or semi-automatic, significantly reducing the need for manual lubrication and ensuring that parts remain adequately lubricated without the risk of human error. This facilitates a longer lifespan of the lathe and enhances the quality of the machining process.

In contrast, the manual application of grease relies on the skill and diligence of the operator, which can lead to inconsistent application and potential human error. Perchloroethylene cleaning is a solvent cleaning method not related to lubrication, while water-based solutions may not provide the necessary protective qualities for the ways of a lathe and might even promote rust if not used correctly.