Question

On 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 1

The correct option is B Plate $2:1$ revolution and $9$ holes in $21$ hole circles

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