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Which of the following method is used for the determination of flatness when the surface is irregular?

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Which of the following method is used for the determination of flatness when the surface is irregular?

(a) Half grid method

(b) Grid method

(c) Contact method

(d) Non contact method

The question was asked in an internship interview.

This interesting question is from Flatness Testing topic in portion Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

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The correct answer is (c) Contact method

Best explanation: When the surface is irregular, contact method of testing for flatness is used. In the contact method there is a most intimate possible contact between flat and work piece and there will be attempt to maintain a wedge.

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