Hard turning

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Hard turning is a single-point machining process (i.e., one carried out on a lathe) carried out on "hard" materials (where "hard" is defined as having a Rockwell C hardness greater than 45). The process is intended to replace or limit traditional grinding operations that are expensive, environmentally unfriendly, and inflexible.

Hard turning, when applied for purely stock removal purposes, competes favorably with rough grinding. However, when it is applied for finishing where form and dimension are critical, grinding is superior.