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).
Inter-organization letter from Cadillac Motor Car Company discussing gear tooth relief, rotary lapping, and practices for LaSalle transmissions.
| Identifier | ExFiles\Box 170\2\ img268 | |
| Date | 2nd April 1935 | |
| GM 47 J CADILLAC MOTOR CAR COMPANY INTER-ORGANIZATION LETTERS ONLY DATE April 2, 1935 TO ADDRESS FROM ADDRESS SUBJECT -2- may at this time show a slight relief due to the grinding wheel not having finished the involute, causing interference, which laps away the tip of mating gear teeth. It is important not to overdo the rotary lapping operation since it finally results in a single pitch line contact. Gears are considered sufficiently lapped when approximately 50% of the operating tooth faces show contact. A chart showing tooth contacts as actually practiced for the Cadillac gears is herewith attached. Our practice for the LaSalle transmission is different due to different lapping method. E.{Mr Elliott - Chief Engineer} R.{Sir Henry Royce} Hyland ERH/am | ||