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).
The best practice for defining and specifying coil springs for manufacturing.
| Identifier | ExFiles\Box 170\4\ img027 | |
| Date | 10th August 1940 | |
| via Boat Mail OY S/D/Aug.10.40 Serial No. 198 15 August 10, 1940 Coil Springs Rolls-Royce, Ltd. Derby, England Rm.{William Robotham - Chief Engineer} When you pass along spring problems for guns, etc., it would save time and trouble if you would define the essentials of the spring and leave the rest up to the spring maker. If the spring is defined on a thumbnail sketch as a hollow cylinder of specified o.d. and i.d., having a certain load at a certain compressed length (either load or length specified with tolerances but not both) and having a certain rate (defined as rate of increase of load for deflection), it is fully described as far as desired characteristics. In some cases an approximate free length is desirable. Indications of use, frequency of operation, temperature, etc., are sometimes desirable. Burton introduced at R.R. Springfield, and with some success at Cadillac, putting a thumbnail load-deflection diagram on all spring details. This practice is best for obtaining samples, as it gets the spring-maker's engineering department working for you, as well as your own. cc: J.M. Lessells OY | ||