his special gear has a number of unique properties. First,
it is impossible to drive a worm gear with any other gear;
a worm gear can be used only as the driver gear, never
as the follower gear. The worm gear comes in handy for
mechanisms that need to lift something up and keep it
raised; in this case, a worm gear acts like a lock that, once
stopped, keeps its follower gear immobile, resisting any
load on it. This is useful in building cranes, forklifts, railroad
barriers, drawbridges, winches, and basically any mechanism
that needs to keep something steady once the motor stops.
Second, the worm gear is extremely useful for gearing down.Every revolution of the worm gear rotates the follower gear
by just a single tooth, reducing speed and increasing torque
drastically. Therefore, worm gears are used for gearing
down whenever very high torque or low speed is needed and
there is little space to use.
Finally, as the worm gear rotates, it has a tendency to push against the follower gear and slide along its own
axle. Usually this tendency has to be stopped by placing a
strong casing around the worm gear, but there are certain
mechanisms that put it to use (see Chapters 8 and 10 for
examples).
his special gear has a number of unique properties. First,
it is impossible to drive a worm gear with any other gear;
a worm gear can be used only as the driver gear, never
as the follower gear. The worm gear comes in handy for
mechanisms that need to lift something up and keep it
raised; in this case, a worm gear acts like a lock that, once
stopped, keeps its follower gear immobile, resisting any
load on it. This is useful in building cranes, forklifts, railroad
barriers, drawbridges, winches, and basically any mechanism
that needs to keep something steady once the motor stops.
Second, the worm gear is extremely useful for gearing down.Every revolution of the worm gear rotates the follower gear
by just a single tooth, reducing speed and increasing torque
drastically. Therefore, worm gears are used for gearing
down whenever very high torque or low speed is needed and
there is little space to use.
Finally, as the worm gear rotates, it has a tendency to push against the follower gear and slide along its own
axle. Usually this tendency has to be stopped by placing a
strong casing around the worm gear, but there are certain
mechanisms that put it to use (see Chapters 8 and 10 for
examples).
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