To reduce tool wear and possible tool breakage when working with tough materials, what should a machinist do?

When working with tough materials, decreasing the spindle speed is beneficial because it helps to reduce the heat generated during the machining process. High spindle speeds can lead to excessive friction and heat buildup, especially with tough materials, which increases the risk of tool wear and breakage. By lowering the spindle speed, the cutting tool experiences less thermal stress, prolonging its life and reducing the likelihood of failure.

Additionally, a lower spindle speed may allow better control during the machining process, leading to more accurate cuts and better finishes. It also provides an opportunity to enhance the effectiveness of lubrication and cooling, which further protects the cutting edges of the tool and helps manage the heat generated during machining operations. This approach is particularly important when the material is hard or abrasive, as it facilitates optimal cutting conditions.