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).
Comparing gear wear on different engines and detailing a 4-step gear production method.
| Identifier | ExFiles\Box 173\1\ img369 | |
| Date | 4th February 1934 guessed | |
| 11 these as a basis for comparison with any material that we may obtain in England. The wear on gears on the 8 cyl has been worse than on the 6 cyl, presumable due to the higher engine speeds. They are building a new small 8 cyl in which they are going to a silent-chain drive. I understand that both Cost, Convenience of disposition of the auxiliaries and Policy enter into this Change. The man doing the job strongly opposes any Change. Production Methods I went carefully over the production set up. 1. Inspect Blanks. Must be within .002 parallel with the bore on the face and not above .002 eccentric on outer dia. If out trued up on lathe or scrapped. 2. Rough cut on a Gould & Eberhardt this leaves .015 on tooth face each side 3. Finish cut on Fellows. This found more satisfactory than Hobbing. High Speed cut used to get clean finish. This is at 900 strokes per min. 4. Burn off rough edges left from op. 3 with | ||