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Gear dimensions are determined in accordance with their specifications, such as Module (m), Number of teeth (z), Pressureangle (α), and Profile shift coefficient (x). This section introduces the dimension calculations for spur gears, helical gears, gear rack, bevel gears, screw gears, and worm gear pairs. Calculations of external dimensions (eg.
- Basic Gear Terminology and Calculation
Module (m) , Pressure Angle (α) , and the Number of Teeth,...
- Pitch Cylinder
Pitch Cylinder – Gear Terminology. A pitch cylinder is one...
- Pitch Surfaces
A pitch surface is the outer surface of a hypothetical...
- Center Distance
Gear Nomenclature > Center Distance. What is a center...
- Profile Shift Coefficient
In this case, the reference pitch line of the gear cutting...
- Pitch Cone
The pitch surface of a bevel gear, which is also known as...
- Intermeshing Pitch Circle
The pitch circle of each gear when a pair of gears are in...
- Gear Nomenclature
Gear Nomenclature - For Mechanical Engineers. This page aims...
- Basic Gear Terminology and Calculation
Module (m) , Pressure Angle (α) , and the Number of Teeth, introduced here, are the three basic elements in the composition of a gear. Dimensions of gears are calculated based on these elements. Tooth Depth and Thickness. Tooth depth is determined from the size of the module (m).
The following charts convert gear pitch dimensional data to the following: Diametral Pitch, Module, Circular Pitch. Module: is the unit of size that indicates how big or small a gear is. It is the ratio of the reference diameter of the gear divided by the number of teeth.
Calculate the key dimensions for your external spur gear. Input the gear's tooth count, pitch (or module), and pressure angle to calculate the pitch diameter, root diameter, and outer diameter. This also generates the tooth dimensions: addendum, dedendum, working depth, and whole depth.
To use the calculator, enter the module and number of teeth and the rest of the table should automatically update. The image below the table gives an indication of what the gear might look like. If you put out-of-range values into any of the fields, it'll probably look wrong!
Design Equations and Formula Circular Pitches and Equivalent Diametral Pitches Table. Gear Design and Selection Application. Spur Gear Calculator and Geometry Generator - Download DXF, SVG, csv file. Spur Gear and Assembly Builder - Download DXF, SVG ***.
Spur Gear Selection For a required centre distance and gear ratio a suitable pair of spur gears can be selected used and assessed by the following procedure. Select numbers of teeth in gears and module (pitch).
