![Two 20^{\circ} full-depth solid spur gears with a diametral pitch equal to 12 and a center-to-center spacing of 3.000 inches as shown in the figure. The speed ratio of the gear. Two 20^{\circ} full-depth solid spur gears with a diametral pitch equal to 12 and a center-to-center spacing of 3.000 inches as shown in the figure. The speed ratio of the gear.](https://homework.study.com/cimages/multimages/16/capture490399053054397710497536941.png)
Two 20^{\circ} full-depth solid spur gears with a diametral pitch equal to 12 and a center-to-center spacing of 3.000 inches as shown in the figure. The speed ratio of the gear.
![Gear terminology - pitch circle, Addendum circle, dedendum circle, Clearance, backlash, … | Mechanical engineering design, Mechanical engineering, Mechanical design Gear terminology - pitch circle, Addendum circle, dedendum circle, Clearance, backlash, … | Mechanical engineering design, Mechanical engineering, Mechanical design](https://i.pinimg.com/originals/8b/ee/a1/8beea1583390213174a4f9dbbebbed49.jpg)
Gear terminology - pitch circle, Addendum circle, dedendum circle, Clearance, backlash, … | Mechanical engineering design, Mechanical engineering, Mechanical design
![gears - Is "pitch diameter" the same as the distance between the centers? - Engineering Stack Exchange gears - Is "pitch diameter" the same as the distance between the centers? - Engineering Stack Exchange](https://i.stack.imgur.com/ti9uH.jpg)
gears - Is "pitch diameter" the same as the distance between the centers? - Engineering Stack Exchange
Consider two "friction" wheels - a Pinion driving a Gear through contact of their outer diameters. The speed ratio is
![Normal Diametral Pitch & Module on an Engineering Drawing for Spur & Helical Gears || Course Preview - YouTube Normal Diametral Pitch & Module on an Engineering Drawing for Spur & Helical Gears || Course Preview - YouTube](https://i.ytimg.com/vi/uneZgmdvBT8/sddefault.jpg)