An operation in which an end mill makes either peripheral or slot cuts across the workpiece, determined by the step-over distance, in order to machine a specified feature. The depth of the feature may be machined in a single pass or may be reached by machining at a smaller axial depth of cut and making multiple passes. For a rough operation, the recommended cutting speed and feed are selected for a peripheral or slot cut. A finish operation will lower the cutting feed according to the finish requirements.