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How many teeths are present in the serrated divider in precision index table?

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How many teeths are present in the serrated divider in precision index table?

(a) 360

(b) 720

(c) 1000

(d) 500

The question was posed to me in quiz.

This interesting question is from Rotary Tables topic in section Angular Measurement and Circular Division of Engineering Metrology

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Best answer
The correct option is (a) 360

For explanation I would say: The indexing in precision index table corresponds to the number of teeth through which the table is indexed. The serrated divider is limited to 360 teeth. Serrated teeth indexer has been developed in 0.25° increment with accuracy of ± 0.1 second of arc.

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