question_answer

A 60-foot gear when hobbed on a differential hobber with a two-start hob, the index change gear ratio is governed by which one of the following kinematic balance equations?

A) 1 revolution of gear blank \[=1/60\] of hob revolutions                  

B) 1 revolution of gear blank \[=1/60\] of hob revolutions

C) 1 revolution of hob\[=2/60\] of hob revolutions

D) 1 revolution of hob \[=1/60\] of blank revolutions.