Assume that all gear blanks are solid circular cylinders unless specified otherwise.
Two 20° full-depth gears have a diametral pitch of 12 and operate with a center-to-center spacing of 3 inches as shown in Fig. 1. The speed ratio of the pair is 2:1. Would you expect to have undercutting on the pinion? What will be the contact ratio for the gear pair?
Figure 1

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