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Standard pressure angles are 14.5, 20, and 25 degrees. Pressure Angle: The pressure angle of a gear is the angle between the line defining the radius of the pitch circle to the point where the pitch circle intersects a tooth, and the tangent line to that tooth at that point. This value is much easier to handle than the circular pitch, because it is a rational number. Module: The module of a gear is simply the circular pitch divided by pi. (so that the length is the length of the arc rather than a line). Two gears must have the same diametral pitch to mesh.Ĭircular Pitch: The distance from a point on one tooth to the same point on the adjacent tooth, measured along the pitch circle. 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.
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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.
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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.