A gear train of a 28 tooth pinion and a 60 tooth spur gear is designed...
A gear train of a 28 tooth pinion and a 60 tooth spur gear is designed to operate with the following:
a 25 degree pressure angle, full-depth involute teeth, and a diametral pitch of 16 teeth/in. The standard center distance is increased by 0.125 inches. At what pressure angle do the gears operate now?
Homework Answers
module = 1/Diametrical pitch = 1/16 = 0.0625 inch
now initial centre disatnce = m*(Tp+Tg)/2 where Tp and Tg are tooth on pinion and gear respectively
0.0625*(28+60)/2 = 2.75 inch
new centre distance =2.75+0.125 = 2.825 inch
But base circle radius remains same
so 2.75 *cos 25 = 2.825 * cos 
where
is new pressure angle
so cos
= 0.8822
= 28.085 degrees
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