Millwright Level 1 Practice Exam

What is the primary purpose of cutting fluids in machining?

1. To increase cutting speed

2. To decrease heat and friction

3. To lubricate the workpiece

4. To minimize the need for maintenance

The correct answer is: To decrease heat and friction

The primary purpose of cutting fluids in machining is to decrease heat and friction. During the machining process, significant amounts of heat can be generated due to the cutting action. If this heat is not controlled, it can adversely affect both the workpiece and the cutting tool, potentially leading to tool wear, changes in material properties, or even tool failure. Cutting fluids serve several critical functions in this context. By cooling the cutting zone, they help dissipate heat away from both the tool and the workpiece, which aids in maintaining the integrity of both during operation. Additionally, reducing friction between the tool and the material being machined not only prolongs the life of the tool but also enhances the quality of the finished product. The better the thermal management and lubrication provided by cutting fluids, the more efficient the machining operation becomes, resulting in an overall improvement in performance. While cutting fluids can also play roles in lubrication, increasing cutting speed, and reducing maintenance needs, these are not their primary functions. Overall, the key focus remains on controlling heat and reducing friction to ensure optimal machining conditions.