How many teeth should be on a hacksaw blade that is used to cut machine steel?

• A. 8
• B. 12
• C. 14
• D. 16

Answer: (C)

When cutting machine steel with a hacksaw blade, the recommended number of teeth per inch (TPI) is important for achieving a smooth and efficient cut. A blade with 14 TPI is optimal for cutting through machine steel because it strikes a balance between cutting speed and surface finish.

A blade with too few teeth may remove material quickly but could result in a rough cut and increased chances of the blade binding or breaking. Conversely, a blade with too many teeth may cut too slowly, leading to increased friction and potential overheating. The 14 TPI specification allows for effective penetration into the material while maintaining control and precision, making it suitable for machine steel.

Using a blade with a different TPI, such as 8, 12, or 16, may not provide the ideal performance characteristics needed for machining operations, particularly as the material properties of steel require a certain level of tooth engagement for optimum results. Hence, 14 teeth per inch is the preferred choice for this application.