Millwright Level 1 Practice Exam

Using the correct RPM is important when operating which type of drill?

1. Twist drill

2. High-speed drill

3. Center drill

4. Auger drill

The correct answer is: Center drill

The importance of using the correct RPM (revolutions per minute) is particularly critical when operating a center drill. Center drills are designed for creating a conical point on a workpiece, which aids in accurately locating and starting subsequent drilling operations. The RPM settings for center drills are vital because they must be matched with the specific material being drilled to prevent issues such as excessive heat generation or tool wear, which can negatively affect the quality of the workpiece and the life of the drill. Using the appropriate RPM helps to achieve cleaner, more precise entry holes and ensures that the tool operates effectively within its intended specifications. While RPM is still significant for other types of drills, center drills have a distinctive design and function that particularly emphasizes the need for precise rotational speeds.