Gear Rack Pitch

ISO (International Organization for Standardization) stipulates that the unit representing the gear size uses modulus. However, other ways are actually used to represent the size of the gear.

Modulus for gear rack pitch

Modulus M = 1 (P = 3.1416) modulus M = 2 (P = 6.2832) modulus M = 4 (P = 12.566)

The gear rack pitch (P) can be obtained by multiplying the modulus by the PI. Pitch is the length between two adjacent teeth. P = Pi x modulus (π m) 

CP (weekly Festival) 

Circumferential gear rack pitch is the circumferential pitch. That is, pitch (P). For example, a gear with a pitch of cp5cp10cp15cp20 can be made by using the circumferential pitch CP. 

Conversion relationship with modulus M = CP / π DP (diameter section) 

It is called diameter pitch in English.

According to the ISO standard, the unit of length is mm. However, in the United States, Britain and other countries, inches have been used as the unit of length. In these countries, DP is used to represent the size of the gear. 

Conversion relationship with modulus M = 25.4/dp

"Modulus" refers to the ratio (m, t/π) between the tooth pitch t and pi of the same side tooth profiles of two adjacent gears, in mm. Module is one of the most basic parameters of modular gear teeth. The larger the module, the higher and thicker the gear teeth. If the number of teeth of the gear is fixed, the larger the radial dimension of the gear. Modular series standards are formulated according to the requirements of design, manufacturing and inspection. For gears with non straight teeth, the module has the difference between the normal module mn, the end face module ms and the axial module x. They are all based on the ratio of their respective tooth pitch (normal tooth pitch, end face tooth pitch and axial tooth pitch) to the circumference, also in millimeters. For bevel gears, the module can be divided into big end module me, average module mm and small end module ml. For tools, there are corresponding tool modulus mo, etc.

Standard modules are widely used.

Standard modulus is the most basic parameter in metric gear drive, worm drive, synchronous belt drive, ratchet, gear coupling, spline and other parts. It plays a role of basic parameters in the design, manufacturing and maintenance of the above parts (see cylindrical gear drive, worm drive, etc.).

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