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1. Planetary gears has high torque than helical gears, there are four points of meshing in a stage in planetary wile helical gears has one point of meshing in a stage.
2. Spherical bearing are used in planetary while taper bearing are used in Helical gears.
3. The straight cut along the wheel of planetary while helical gears are cut at an angle along the wheel.
mesh gear box has against another is by helical
Planetary Units with helical gears, rather than spur gears, have higher torque capacity and run much more quietly.
