For quietness of operation, high speed-reduction ratio and for shaft axes at right angles to each other, worm-type reduction unit is normally used. This can be of double reduction type if very low speeds are envisaged....
Helical gears, while being more complex to make than spur gears, are much better suited for high-speed applications since the teeth engage more gradually than spur gears. Spur gears engage instantaneously along a line across the whole tooth, but...
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