The principle of the gear cutting with shaper cutter can be explained as follows. The cutter reciprocates in the direction of the gear tooth line to produce one virtual gear. IN order to have the gear material correctly mesh with this, it also compulsorily gives a relative movement between the two. Then it shaves off the part which disturbs the movement of teeth of a virtual gear from the gear material, and finally, the tooth profile of the gear is generated.
Above process has enabled features below.
(1) It can handle gear cutting of an internal gear.
(2) It can handle gear cutting of a layered gear.
(3) It can handle gear cutting of a special gear.
    (joint gear or lacking teeth)