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What is the upper limit that is commonly accepted for waviness measurement?

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What is the upper limit that is commonly accepted for waviness measurement?

(a) 10mm

(b) 20mm

(c) 25mm

(d) 15mm

I have been asked this question during an interview.

Asked question is from Terminology as per Indian Standards in section Measurement of Surface Finish of Engineering Metrology

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The correct option is (c) 25mm

For explanation: There is no theoretical value that could be assigned to maximum spacing for waviness as higher value of waviness tends to merge with other general errors in geometric forms. 25mm is the upper limit commonly accepted as suitable for waviness measurement.

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