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00221_Field_GearBackground.txt
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1997-05-26
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Background Information
Gears are toothed wheels.
Two or more gears can be
connected together to
change the speed and/or
moving object. The gear
that turns, or drives, the
other gears is called the
driving gear.
When a driving gear turns,
the teeth on the gear push
against the teeth of the
connected gear. The causes
the connected gear to turn
in the opposite direction. I
even numbers of gears are
connected together, the
resulting motion will be in a
direction that opposite of the
motion of the driving gear.
If odd numbers of gears are
connected together, the
resulting motion will be in
the same direction as the
motion of the driving gear.
When different sizes are
gears are connected
together, the speed of
motion changes. A smaller
gear turns faster than a
larger gear. The number of
times the driving wheel turns
for each turn of the gear
being driven is called the
gear ratio. For example, a
gear ratio of 3:1 means that
the gear that is being turned
turns only once for every
three turns of the driving
wheel.