Most cutting tools shape a part over many passes. A broach does it in one stroke, because it carries its own depth of cut built into the tool. A broach is a tapered bar studded with rows of teeth, each standing slightly proud of the last. That step is the rise per tooth (RPT), and it is the whole trick: as the broach is pushed or pulled through the workpiece in a single linear pass, every tooth peels away a fresh layer roughly equal to its rise above its neighbour. The tool never cuts deeper by feeding, the depth is machined into the geometry itself. The teeth are graded across three zones: - Roughing teeth, largest RPT (0.05 to 0.15 mm), doing the bulk removal - Semi-finishing teeth, tapering the increment down - Finishing teeth, all sat at identical height with zero rise, sizing the profile and absorbing tool wear as the front teeth dull Between the edges sit gullets, the curved chip pockets. A chip has nowhere to escape until the stroke ends, so the gullet must swallow the entir...