To find the lead angle, we use the formula:
\[ \tan(\phi) = \frac{L}{ \pi \cdot D } \]
where \( \phi \) is the lead angle, \( L \) is the lead, and \( D \) is the pitch diameter of the worm.
Given: \( L = 7.62 \) cm and \( D = 3.81 \) cm.
\[ \tan(\phi) =
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