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The calculation method of the diameter of the gear:
Tip circle diameter = (number of teeth + 2) * modulus
Index circle diameter = number of teeth * modulus
Root circle diameter = tip circle diameter - (4.5 × modulus)
For example: M4 32 teeth 34*3.5
Tip circle diameter = (32 + 2) * 4 = 136mm
Index circle diameter = 32 * 4 = 128mm
Root diameter = 136-4.5*4=118mm
7M 12 teeth Center distance D = (division circle diameter 1 + division circle diameter 2) / 2 is (12 + 2) * 7 = 98mm
This calculation method is for all analog gears (not including the shift gear).
The modulus represents the size of the gear teeth.
Gear modulus = index circle diameter
= gear outer diameter ÷ (number of teeth - 2)
Gear modulus is national standard (GB1357-78)
Modular standard series (preferred) 1, 1.25, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12, 14, 16, 20, 25, 32, 40, 50
Modular standard series (optional) 1.75, 2.25, 2.75, 3.5, 4.5, 5.5, 7, 9, 14, 18, 22, 28, 36, 45
Modular standard series (as much as possible) 3.25, 3.75, 6.5, 11, 30
Other than the above values ​​are non-standard gears, do not use!
Do not put water into the plastic gear after injection molding
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