The two most common pulleys are the regular half
bush and the wedge belt wheel (so named because of its
resemblance to real-life wheels designed to work with wedge
belts, which we replace with rubber bands). The large pulley
is less common, and the Micromotor pulley is the rarest, as
it was originally meant to appear only with the LEGO Micromotor. When we connect two pulleys with a rubber band or
a string, we create a gear ratio between them, just as we
do in a chain system. The ratio depends on the proportion
of their driver and follower diameters, which are shown in
Figure 6-10. By driving a wedge belt wheel with a half bush,
for example, we get a 21:5.8 ratio, which is equal to 3.6:1.
And by driving a Micromotor pulley with a large pulley, we
get a 9:32 ratio, which is equal to 1:3.55.
The two most common pulleys are the regular half
bush and the wedge belt wheel (so named because of its
resemblance to real-life wheels designed to work with wedge
belts, which we replace with rubber bands). The large pulley
is less common, and the Micromotor pulley is the rarest, as
it was originally meant to appear only with the LEGO Micromotor. When we connect two pulleys with a rubber band or
a string, we create a gear ratio between them, just as we
do in a chain system. The ratio depends on the proportion
of their driver and follower diameters, which are shown in
Figure 6-10. By driving a wedge belt wheel with a half bush,
for example, we get a 21:5.8 ratio, which is equal to 3.6:1.
And by driving a Micromotor pulley with a large pulley, we
get a 9:32 ratio, which is equal to 1:3.55.
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