Question: The centre distance between the two shafts connected by two left-handed helical gears is (0.4 mathrm{~m}). The shaft angle is (60^{circ}) and normal module is

The centre distance between the two shafts connected by two left-handed helical gears is $0.4 \mathrm{~m}$. The shaft angle is $60^{\circ}$ and normal module is $6 \mathrm{~mm}$. The gear ratio is 2 and larger gear is having 70 teeth. Find the helix angles of the two gears.

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