While indexing which one of the following is used to give exact location of the indexing movement ?

Index plate

Index crank

Selector arm

Worm shaft

1/10th of revolution

1/20th of revolution

1/25th of revolution

1/40th of revolution

The gear ratio between worm and worm wheel in a dividing head is 50 :1

Worm shaft of the dividing head has single start worm

20 turns of index crank revolve the spindle through 180 Degree

For rapid indexing, the worm and worm wheel are to be disengaged

5, 10, 15 holes respectively

10, 20, 30 holes respectively

24, 30, 36 holes respectively

20, 40, 60 holes respectively

9 Degree

18 Degree

40 Degree

45 Degree