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Coated Gear Shaving Cutter
Common normal length
The external gear is the common normal distance measured between the two outer tooth surfaces of adjacent teeth; the internal gear is the common normal distance measured between the two outer tooth surfaces of several adjacent tooth slots, which is called the common normal length. For involute spur gears, the common normal length is calculated in the end plane, and the calculation formula is: Wt=mtcosat[(k-0.5)x+zinvat]+2mtxtsinat (x should have its own symbol, k is the number of cross teeth). The involute helical tooth (or herringbone tooth) cylindrical gear is measured in the normal plane, and its value is: Wn=Wtcosβb. The length of the common normal line is an important indicator for checking the depth of cutting teeth and determining the level of accuracy.
The length of the common normal can be directly checked from the relevant table.
