Assume that all gear blanks are solid circular cylinders unless specified otherwise.Two ge...

Assume that all gear blanks are solid circular cylinders unless specified otherwise.

Two gears, both having a pitch radius of 6 inches operate with a pressure angle of degrees and a diametral pitch of Pd = 1.0. Assume that the undercutting causes the line of action to be from point B in Fig. 1 to the corresponding point the line of action for the mating gear. If point B is a third of the way from the base circle to the pitch circle, find the contact ratio for this gear pair. Is this contact ratio satisfactory?

Figure 1