involute worm
4.The Theory of Singular Conjugation and the Principle and Technology of 0~° Involute--Enveloping Worm Gear Drive
6.The software uses two entity configuration methods: extruding and simulating entity cutting in realizing three dimensional configuration, which successfully achieve three dimensional configuration of involute columnar vertical gear, involute columnar helical gear, standard vertical spline, archimedes worm and disco-cam.

