How does excessive coolant during machining affect tool wear?

• A. Increases tool temperature
• B. Reduces friction and wear
• C. Causes rust on tools
• D. Results in oversize holes

Answer: (B)

Excessive coolant during machining primarily serves to reduce friction between the tool and the workpiece. This reduction in friction decreases the amount of heat generated during the cutting process, which can significantly contribute to lower tool wear. When the tool operates at a lower temperature, it is less susceptible to thermal degradation, which extends its lifespan and effectiveness.

Moreover, by effectively lubricating the cutting surface and allowing for better chip removal, a large quantity of coolant can help maintain optimal operating conditions. This is crucial because high temperatures and excessive friction are often the main culprits behind increased tool wear. Therefore, ensuring that the tool remains well-lubricated and cool through the use of sufficient coolant directly correlates with improved tool performance and longevity.