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Gear Cutting - Helical Gear Cutting, Herringbone Gear Cutting, Gear Hobbing
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Helical gears are gears where the gear teeth are cut at an angle to the gear face. A helical gear enables teeth meshing to run more smoothly as more than one tooth is engaged at any one time. The helical gear profile also transfers some of the load to the axial direction so thrust bearings or tapered bearings are usually required to carry this axial load as opposed to a spur gear where the load is radial only.
A herrigbone gear has 2 rows of helical gears side-by-side with opposing helix angles. The opposing helical gears counteract the axial thrust imparted.
Helical gear cutting is a process used to machine helical gears by simultaneously turning the gear blank as the milling cutter is fed along. Helical gear cutting can be accomplished by either conventional gear cutting equipment such as gear hobbing, or more commonly by CNC gear hobbing processes.
Helical gears can also be produced by rolling. Helical gears can be precision ground or lapped after cutting and heat treatement.
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