To advance a new method,that is directly to use existing hob cutter under first eveloping to manufacture worm gear and tool gear having its shape as same as worm gear but later may only have one tooth to be an assembled tool along a spiral line(helix).It will be more economical and can realize back-off of tool that current tool can't to do it.This metnod can also realize instantaneous dual line contact for twice eveloping torus worm drive.
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