Which of the following is not a principal part of a drill bit?

Which of the following is not a principal part of a drill bit?

• A. Flute
• B. Point
• C. Body
• D. Shank

Answer: (A)

Understanding drill-bit anatomy helps you see what really defines a “principal part.” The main sections you learn about are the tip (the point) that does the cutting, the long cylindrical portion (the body) that forms the working length, and the end that fits into the drill chuck (the shank). Flutes are the spiral grooves that run along the bit to carry away chips and provide clearance. They’re essential for cutting and chip evacuation, but they’re considered a feature of the bit’s geometry rather than one of the primary parts. That’s why the flute isn’t counted as a principal part, while the point, body, and shank are.

Understanding drill-bit anatomy helps you see what really defines a “principal part.” The main sections you learn about are the tip (the point) that does the cutting, the long cylindrical portion (the body) that forms the working length, and the end that fits into the drill chuck (the shank). Flutes are the spiral grooves that run along the bit to carry away chips and provide clearance. They’re essential for cutting and chip evacuation, but they’re considered a feature of the bit’s geometry rather than one of the primary parts. That’s why the flute isn’t counted as a principal part, while the point, body, and shank are.