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What is the tool maker’s flat size which generally uses both the faces as a working surface?

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What is the tool maker’s flat size which generally uses both the faces as a working surface?

(a) 30 to 45 mm

(b) 50 to 75 mm

(c) 75 to 100 mm

(d) 100 to 200 mm

This question was posed to me by my school principal while I was bunking the class.

The question is from Tool Maker’s Flats and High Precision Surface Plates in division Linear Measurements of Engineering Metrology

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The correct answer is (b) 50 to 75 mm

The best explanation: Both the faces are highly finished in the range of 50-75 mm size and both are used as working surface and above this range it has only one face finished as working surface.

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