Millwright Level 1 Practice Exam

What must be done to machined surfaces on a drill press to prevent rust?

1. Leave them dry

2. Keep them clean and oiled

3. Use abrasive cleaners

4. Apply paint to the surface

The correct answer is: Keep them clean and oiled

Machined surfaces on a drill press are particularly susceptible to rust due to exposure to moisture and air. Keeping these surfaces clean and oiled serves multiple purposes. First, the oil acts as a barrier against humidity and moisture, which are key factors in the oxidation process that leads to rust formation. Additionally, oiling prevents the accumulation of dirt and grime, which can also contribute to corrosion over time. By maintaining a clean and lubricated surface, the longevity of the drill press and the quality of the machined workpieces can be significantly enhanced. Using abrasive cleaners, as suggested by another option, could potentially damage the finish of the machined surfaces, which would make them more vulnerable to rust. Leaving them dry would expose them to moisture without any protective coating, increasing the risk of corrosion. Applying paint could interfere with the functionality of the machine, particularly affecting precision and operation, which means it's not the appropriate method for protecting machined surfaces. Hence, keeping the surfaces clean and oiled is the most effective approach to prevent rust on a drill press.