One brand of milling machining has the following two index plates supplied along with the indexing head. Plate 1: 15, 16, 17, 18, 19, 20 hole circles. Plate 2: 21, 23, 27, 29, 31, 33 hole circles. It is proposed to mill a spur gear of 28 teeth using simple indexing method. Which one of the following combinations of index plate and number of revolutions is correct?

Plate 2 :1 revolution and 9 holes in 23 hole circles

Plate 1: 1 revolution and 9 holes in 18 hole circles

Plate 2 :1 revolution and 9 holes in 21 hole circles

Plate 2 :1 revolution and 9 holes in 23 hole circles

Plate 1 :1 revolution and 9 holes in 15 hole circles

One brand of milling machining has the following two index plates supp

1.	One brand of milling machining has the following two index plates supplied along with the indexing head. Plate 1: 15, 16, 17, 18, 19, 20 hole circles. Plate 2: 21, 23, 27, 29, 31, 33 hole circles. It is proposed to mill a spur gear of 28 teeth using simple indexing method. Which one of the following combinations of index plate and number of revolutions is correct?
A.	Plate 1: 1 revolution and 9 holes in 18 hole circles
B.	Plate 2 :1 revolution and 9 holes in 21 hole circles
C.	Plate 2 :1 revolution and 9 holes in 23 hole circles
D.	Plate 1 :1 revolution and 9 holes in 15 hole circles
Answer» C. Plate 2 :1 revolution and 9 holes in 23 hole circles

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