When measuring gears, why are they often measured near the high gear section?
In general, the top of the gear tooth has a trim edge, and the tooth root has a transition curve, neither of which is an involute; only the high profile of the tooth is an accurate involute, and the tooth profile is the design curve. In order to measure the error of involute gear accurately, it must be measured on the involute part, so it should be measured near the high school of tooth".
Not high school but in the teeth near the park where the diameter of section modulus of spur gear, for example: 4, full height is 9 teeth, tooth thickness should be in place from the top gear measuring 4 mm, so the use of "near" tooth high school is not correct, although it is in the vicinity of the central,
This is the pitch diameter of the high gear, which is a necessary point for the design and measurement of gears.
