Diagram and calculations for a 250 HP Sun Wheel and Planet Pinion gear mesh.
| Identifier | ExFiles\Box 28\5\ Scan107 | |
| Date | 10th March 1916 guessed | |
| 250 H.P. Sun Wheel & Planet Pinion. Scale 5/1 X 2044 45 teeth 12 D.P. 3.750 dia. P' = π/12 = .2618 P' cos 14 1/2° 1.875 + .083 = 1.958" Root Circle Base Circle Pitch circle Addendum Circle 14 1/2° Line of Action MP = .313 BP = .253 AP = .265 PD = .247 AD = .512" Twice normal pitch = .507" = path of contact Two teeth always in contact No interference 1.210 1.250 1.333 30 teeth 12 D.P. 2.500 dia Diagram labels: M, A, B, P, D, C, H | ||
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).