In machining terminology, what does 'feed' refer to?

In machining terminology, 'feed' refers specifically to the rate at which the cutting tool advances into the workpiece. This is a critical parameter in machining operations, as it directly influences the quality of the cut, the surface finish of the workpiece, and the overall productivity of the machining process.

Feed can be specified in different units depending on the context, such as inches per minute or millimeters per revolution. This rate tends to vary based on factors such as the type of material being machined, the geometry of the workpiece and tool, and the desired outcomes of the machining process, such as tolerances and surface finish.

Understanding the concept of feed is essential for machinists, as it impacts the cutting force, power requirements, tool wear, and the possibility of workpiece damage. Proper control of feed ensures optimal cutting conditions, which enhances the efficiency and accuracy of machining operations.

In this context, the other options do not correctly define 'feed.' The amount of material removed relates to cutting depth or volume, rotational speed pertains to the tool's speed of rotation, and cooling rate is associated with tool life and workpiece temperature management, none of which directly describe the concept of feed as used in machining.