27
GEAR RATIO
25
Build a horizontal to vertical gearbox
2
2
1:1
2
Final assembled model
26
Carefully observe the cogwheels when they rotate and compare
the number of revolutions completed by the various cogwheels.
When the larger cogwheel has completed a revolution, the small-
er one will have completed 4. You can prove this by dividing the
number of teeth of the two cogwheels (ratio).
Example: how to calculate the gear ratio.
41 teeth (larger wheel)
10 teeth (smaller wheel)
= 4.1 revolutions
1
Stand assembled in
Activity 21
2
X1
X1
2
26
X2
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