Similar to planing, the insertion clamp is located at the lower part of the insertion machine slider and can extend into the hole of the workpiece to perform vertical reciprocating motion. The downward direction represents the working stroke, and the upward direction represents the return stroke. The parts installed on the slotting machine workbench undergo intermittent feed motion after each return stroke of the slotting tool.

The main use is high-speed steel, and the cutting speed for cutting steel and cast iron is usually 15-25m/min. To avoid strong friction between the tool surface and the workpiece during return, which may damage the machining surface and shorten the tool life, a movable tool can be inserted into the rod.