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Upto which inclination sine centres can be used?

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Upto which inclination sine centres can be used?

(a) 45 degree

(b) 90 degree

(c) 120 degree

(d) 60 degree

This question was posed to me during an online exam.

The query is from Sine Principle and Sine Bars topic in portion Angular Measurement and Circular Division of Engineering Metrology

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The correct option is (d) 60 degree

The best I can explain: These are used up to 60 degree angle. Rollers are clamped firmly to the body. Sine centre is a very useful device for testing the conical work centered. The principle of setting sine centre is same as of sine table.

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