When machining hard materials, which technique might a machinist use?

High-speed machining is a common technique used when working with hard materials because it helps to reduce tool wear and improve efficiency. This method involves increasing the cutting speed, which not only accelerates the machining process but also minimizes the heat generated at the cutting edge of the tool. When cutting hard materials, excessive heat can lead to rapid tool degradation and failure. By increasing the speed, the material is removed before excessive heat can build up, thus prolonging the life of the cutting tool.

Additionally, high-speed machining often utilizes optimized cutting tools designed specifically for use with hard materials. This combination results in a more efficient and effective machining process, ensuring better surface finishes and tighter tolerances while also minimizing downtime due to tool changes.

The other techniques listed do not effectively address the challenge of machining hard materials. For example, relying solely on cutting fluids does not inherently solve the issue of tool wear. Increasing machine vibration would likely be detrimental, leading to poor machining quality and further tool wear. Permanently binding tools to the material is not a standard or feasible method in machining practices as it would complicate or hinder the machining process.