![]() ![]() It is also known as globoidal worm gearing. : 3ĭouble-enveloping worm gearing comprises enveloping worms mated with fully enveloping worm wheels. Īn enveloping (hourglass) worm has one or more teeth, and increases in diameter from its middle portion toward both ends. This type of gearing can support the highest loading. The final type are double-throated worm drives, which have both gears throated. The second are single-throated worm drives, in which the worm wheel is throated. These don't have a throat, or groove, machined around the circumference of either the worm or worm wheel. ![]() There are three different types of gears that can be used in a worm drive. A double bass features worm gears as tuning mechanisms Types
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