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).
Different drafting and design methods, comparing an aluminum sheet method with the Cadillac system.
| Identifier | ExFiles\Box 178\2\ img075 | |
| Date | 7th March 1940 | |
| Serial No. 7 Rn.{Mr Robinson} page 4 enamelled aluminum sheet, used in coachwork, which found an un-fortunate entrance into engine and chassis work about 1930. This aluminum sheet method was almost worse than the earlier methods of self-hypnotism practiced by all draftsmen. The Cadillac system uses shrink-proof tracing paper (synthetic wax-base) and a black pencil with a round point, or a fat blue pencil. A complete new model chassis is laid out full scale in three views with straight lines and free-hand sketching methods, and has in this form all the accuracy which is going to be obtained on the finished car. Prints can be taken off at this stage and the experimental shop works to them with a few leading dimensions. After the car has proved itself out, better details are made and from these a more careful final layout is made on the big board and kept as a permanent record. The draftsmen who work on the big board got plenty of exercise and don't get constipated. R.B. We may do this already. I don't know, but am taking a chance. Seaholm says all their original work has been done on the big board for years, and that it is the best thing they ever did. OZ | ||