Data Sheet

Project 21
Build the circuit as shown. The large gear
is placed on the gear insert and mounted
on the orange motor (M9), and the small
gear is placed on a 3D snap which is
mounted on a stack of snap wires (a 5-snap
on level 1, 3-snaps on levels 2 and 3, a 2-
snap on level 4, and a 1-snap on level 5).
The teeth should be pointed up on both
gears. Turn on the slide switch (S1) to spin
the gears.
Gears can be used to make things spin faster or slower.
When one gear has more teeth than another, it will spin
slower. Using gears to reduce rotation speed also increases
the turning force, allowing it to overcome more friction. Using
gears also changes the direction of rotation.
Inside the orange motor (M9) is a motor spinning very fast,
but with little force (too little to spin both orange gears).
Several small internal gears connect the internal motor to
the metal shaft that you see; these reduce the rotation
speed, give the shaft enough force to spin the orange gears,
and also make it easier to control.
Project 22
Inverse Gear Ratio
Use the preceding circuit but swap the locations of
the large and small gears. Now the 3D snap spins
more slowly.
Gears
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SC-3DMEG_Manual.qxp_SC-3Di_Manual_060816 6/19/17 7:30 PM Page 24