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What is blank diameter?

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in Engineering Metrology by (829k points)
What is blank diameter?

(a) Pitch circle diameter plus addenda

(b) Pitch circle diameter plus twice the addenda

(c) Base circle diameter plus addenda

(d) Base circle diameter plus twice the addenda

I got this question in an online interview.

Origin of the question is Terminology of Gear Tooth in section Measurement and Testing of Gears of Engineering Metrology

1 Answer

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Right choice is (b) Pitch circle diameter plus twice the addenda

The explanation is: Blank diameter is that diameter of blank from which gear is out. Blank diameter is equal to the pitch circle diameter plus addenda.

Blank diameter = mN + 2m = m x (N + 2).

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