A helical gear has a normal pressure angle (phi_n) of 20 degrees and a helix angle (psi) of 30 degrees. What is its transverse pressure angle (phi_t)?
Explanation
In helical gears, the pressure angle in the plane of rotation (transverse) is different from the pressure angle in the plane normal to the tooth. Their relationship is defined by a trigonometric formula involving the helix angle.
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