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).
Analysis of casing cracks, comparing moulded versus machined production with a cost-benefit breakdown and recommendation.
| Identifier | ExFiles\Box 149\2\ scan0208 | |
| Date | 5th April 1939 guessed | |
| -6- These cracks are indicated in Figs. 4 and 5. The cracks indicated in Fig.6. are probably due to the fact that the casing was machined from the solid, and to the subsequent porosity of the material. It is felt that if the casing were properly moulded, the tendency for cracks to start would be eliminated, and likewise if the bushes were moulded into position instead of being pressed in. The bushes could be reamed after moulding. From the cost analysis it will be seen that there is a saving of 9.271 shillings per chassis involved, that is an 80% reduction in factory cost. The mould cost of £154. will be recovered after 332 chassis have been produced. It is suggested that as the experimental pump completed the equivalent of some 20,000 miles (assuming 30 m.p.h. for 652 hours) before failure, and that the cost is so substantially reduced, it is worth while considering the possibility of a moulded pump for Bentley V.{VIENNA} RHC{R. H. Coverley - Production Engineer}/D.W.Brown. | ||