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If reference circle of gear is eccentric then which error is reflected by this eccentricity?

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If reference circle of gear is eccentric then which error is reflected by this eccentricity?

(a) Cyclic error

(b) Periodic error

(c) Pitch error

(d) Undulation

This question was posed to me during an internship interview.

The question is from Gear Measurement in division Measurement and Testing of Gears of Engineering Metrology

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Right answer is (c) Pitch error

To explain: It must be emphasised that there are some in-built limitations in the gear itself while the accuracy of measurement of gear depends upon the measuring equipment available, such as the inability of a gear to define its own axis of rotation. Thus if the reference circle of gear is eccentric, it would be reflected in pitch error.

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