What is one purpose of performing regular maintenance on machines?

Performing regular maintenance on machines primarily aims to prevent unexpected equipment failures, which can lead to costly downtime and repairs. Regular maintenance includes a variety of tasks such as inspections, lubrication, adjustments, and parts replacements that collectively address wear and tear on machinery. By identifying and rectifying potential issues before they escalate, maintenance helps maintain operational efficiency and reliability. This proactive approach not only ensures that the equipment operates smoothly but also enhances the safety of the workplace, as sudden failures can pose risks to personnel and production processes.

The other options do not reflect the objectives of maintenance practices. Reducing the lifespan of equipment goes against the very principle of maintenance, which is aimed at prolonging the life of machines. Ensuring the production of defective products is not a goal of maintenance; rather, it aims to enhance the quality of output. Lastly, increasing energy costs contradicts the goal of maintenance, which often seeks methods to optimize performance and reduce operational expenses.