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If you mean find the helical angle, alpha, using the pitch, p, with a shaft of radius, R, at the root of the teeth then:

alpha= arctan( p /(2R) )

Otherwise, if you mean find the helical angle while designing a gear, it is quite complicated and requires the knowledge of various parameters such as the maximal torque, speed, material, etc.

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Q: How do you find helical angle?
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