How does proper coolant usage affect tool life?

Proper coolant usage significantly extends tool life by reducing heat and friction during the machining process. When cutting tools operate, they generate a considerable amount of heat due to the friction between the tool and the workpiece. This heat can lead to tool wear, deformation, and even failure if not managed effectively.

Using coolant helps to dissipate this heat, allowing the tool to maintain a lower operating temperature. Additionally, coolant acts as a lubricant, reducing friction between the tool and material being machined. This combination of thermal management and lubrication not only helps to preserve the integrity of the cutting edge but also enables the tool to maintain performance over a longer period, resulting in increased productivity and reduced costs associated with tool replacement.

In contrast, the other options do not reflect the benefits of proper coolant usage in a machining context. For instance, decreasing machining speed or shortening the lifespan of tools runs contrary to the fundamental purpose of using coolant, which is to enhance both speed and longevity. The idea that coolant has no effect on tool life is also inaccurate, as significant evidence supports its vital role in extending the life of cutting tools.