Gear Tooth shaper cutter or toothed bar comb cutter teeth. When cutting teeth with the gear shaper, the cutter rotates with the spindle of the gear shaper, and the gear-shaper cutter and the workpiece are rotated by a certain speed ratio to ensure that the workpiece also turns a tooth when the gear tooth is transferred to one tooth, and the teeth shape of the gears is accurately enveloping, if a spiral guide is added to the spindle of the gear shaper. Bevel gears can also be machined with helical gear shaper cutters. If a gear-shaper attachment is installed on the slotting Machine Workbench, the rotary movement of the worktable becomes a linear motion, then the rack can be inserted. The Gear shaper can be adapted to a smaller distance, and is suitable for machining gears with a convex shoulder or a narrow gap in the slot, while also facilitating the machining of sector, internal and non-circular gears. The machining accuracy of the gear shaper can reach 6~8 grade.