When comparing the calculation results, the modulus m calculated from the contact fatigue strength of the tooth surface is greater than the modulus m calculated from the bending fatigue strength of the tooth root. Since the size of the gear module m mainly depends on the load-bearing capacity determined by the bending strength, the contact fatigue of the tooth surface depends on the load-bearing capacity determined only by the gear diameter (ie, the module is related to the number of teeth multiplied by the machine). The modulus can be calculated from the bending strength of 3.94 mm and rounded to 4 mm. The diameter of the index circle is calculated according to the contact strength:
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