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).
And sketch regarding machining clearance for new 10/43 ratio rear axle gears on the Bentley II.A.
| Identifier | ExFiles\Box 84\4\ scan0379 | |
| Date | 2nd March 1938 | |
| To. M.D.S. c.c. Mr. Grylls. BY/CRL.{C. R. Lisson}4/E.2.3.38. 202 BENTLEY II.A. REAR AXLE. SECTION 6120. Owing to the introduction of 10/43 Ratio Rear Axle Gears at 101 in "M" Series Onwards, the teeth of which will be as on GB.2352, we wish to find out if the cutter for machining the root of the teeth will clear the extended nose as shown on sketch below. BY/CRL.{C. R. Lisson} TEETH AS ON GB2352. WILL CUTTER CLEAR THIS DIAMETER .062 R ± 1/8 1.063 DIA +0/-10 25° +2°/-2° .125 +0/-10 1.787 +0/-10 2.675 +0/-10 | ||