Question

If the index crank of a dividing head is turned
through one complete revolution and 10 holes
in a 30 hole circle plate, the workpiece turns
through (in degrees)
(a) 6
(b) 12
(c) 240
(d) 480​

Answer 1

6

Explanation:

in 30 holes 10 revolves in 5 steps i.e 6

Answer 2

Answer:

(b) 12°

Explanation:

(for plain indexing or worm gear indexing.)

1 revolution of Crank = 360/40 = 9°

and further 10 holes in 30 hole plate so, it is 1/3 of 1 revolution of Crank.

1/3 revolution of Crank in degree

= 1 revolution of Crank/3= 9/3 = 3°

total rotation of work piece= 9°+3°= 12°

with direct or bevel gear indexing answer could be 20 but it is not given so, we can use above solution.