You can use the pitch diameter to calculate how far away two gears should be: the sum of the two pitch diameters divided by 2 is equal to the distance between the two axes.ĭiametral Pitch: The ratio of the number of teeth to the pitch diameter. Pitch Diameter: The pitch diameter refers to the working diameter of the gear, a.k.a., the diameter of the pitch circle. If the two gears were instead two discs that drove by friction, the perimeter of those discs would be the pitch circle. The pitch circles of two meshing gears need to be tangent for them to mesh. Pitch Circle: The circle that defines the "size" of the gear. Gears will only transmit rotation if their teeth mesh and have the same profile. The number of teeth on a gear must be an integer.
Teeth: The jagged faces projecting outward from the circumference of the gear, used to transmit rotation to other gears. In order for gears to mesh, the diametral pitch and the pressure angle need to be the same.Īxis: The axis of revolution of the gear, where the shaft passes through There are a few different terms that you'll need to know if you're just getting started with gears, as listed below.
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