The principal gain of worm gears is their potential to supply large reduction ratios and correspondingly large torque multipliers. They can also be employed as reducers for minimal to medium velocity apps. Also, because their reduction ratio is primarily based on the amount of tooth on the gear, they are much more compact than other kinds of gears. Like good pitch leadscrews, worm gears are typically self-locking, making them best for hoisting and hoisting purposes.

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