What does the term 'feed rate' refer to in CNC milling?

The term 'feed rate' in CNC milling specifically refers to the speed at which the cutting tool advances through the material being machined. It is a critical parameter that influences the quality of the finished part and the efficiency of the milling operation. A precisely controlled feed rate allows for optimal cutting action, ensuring that the tool removes material effectively without leading to excessive wear or damage to the cutting edges.

In practical terms, the feed rate can be measured in units such as inches per minute (IPM) or millimeters per minute (mm/min), depending on the system of measurement. A higher feed rate can increase productivity but may also reduce the quality of the finish if it exceeds the material's capacity to be cut smoothly. Therefore, feed rate is essential for balancing speed and precision during the milling process.

Understanding this definition helps in making informed decisions regarding tooling, materials, and machine settings during CNC operations.