Intro to Millwright Practice Exam

What is the cutting end angle of sharpened drill bits?

1. 90 degrees

2. 118 degrees

3. 135 degrees

4. 150 degrees

The correct answer is: 118 degrees

The cutting end angle of sharpened drill bits is particularly crafted to optimize performance while drilling through various materials. A cutting end angle of 118 degrees is commonly used for general-purpose drill bits. This angle strikes a balance between penetration and cutting efficiency, allowing the bit to effectively remove material and maintain stability while drilling. Using a 118-degree point angle helps in reducing the resistance encountered during drilling, ensuring smoother operation. This angle is effective for a variety of materials, including metals and plastics, making it versatile for both professional and DIY applications. It's specifically designed to provide a sharp cutting edge that facilitates efficient drilling and helps prolong the life of the tool. Although other angles, like 90, 135, and 150 degrees, are used in specific applications, such as in the drilling of hard materials or when precision is paramount, the 118-degree angle remains the most widely adopted standard for general drilling tasks. This is why it is considered the correct answer in this context.