Worm Wheel
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Throated, non throated and double throated worm gears. In single throated worm gears, the worm wheel is the component which is throated. In non throated worm gears, the machining process is done around the worm wheel circumference. In double throated system, both gears are throated. This results in higher torque loading capacity, Hourglass worm has one or more teeth, and the diameter is higher on the sides and smaller at the center.