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The dedendum circle diameter is equal to

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+1 vote
in Machine Kinematics by (38.0k points)
The dedendum circle diameter is equal to

(a) pitch circle dia. x cosɸ

(b) addendum circle dia. x cosɸ

(c) clearance circle dia. x cosɸ

(d) pitch circle dia. x sinɸ

I got this question in final exam.

I need to ask this question from Systems of Gear Teeth topic in portion Toothed Gearing & Gear Trains of Machine Kinematics

1 Answer

0 votes
by (106k points)
The correct choice is (a) pitch circle dia. x cosɸ

Explanation: It is the circle drawn through the bottom of the teeth. It is also called root circle.

Root circle diameter = Pitch circle diameter × cos φ, where φ is the pressure angle.

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