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Feed rate in CNC milling refers specifically to the speed at which the cutting tool moves through the material being machined. This measurement is typically expressed in units of distance per time, such as inches per minute (IPM). It's a critical parameter that helps ensure efficient cutting while achieving the desired surface finish and dimensional accuracy.

A properly set feed rate allows for optimal tool life, minimizes wear, and contributes to improved machining efficiency. If the feed rate is too high, it can lead to poor surface finish and potential tool breakage, whereas a feed rate that is too low may result in longer machining times and reduced productivity.

Understanding how to set and adjust the feed rate according to the material properties, cutter type, and operation type is fundamental for CNC operators to maximize performance and quality in machining processes.