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Helical gears transmit rotary motion between crossed or parallel shafts. That’s why the teeth are produced in an angle to the axis of the shaft. This way two or more teeth are always in contact with each other when the mating occurs. This permits smoother action than that of spur gears. But the axial thrust that is generated because of the angle of the teeth does causes a slight loss of power and requires the use of thrust bearings.
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