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).
Production process for sorting, pairing, and measuring engine liners and drums.
| Identifier | ExFiles\Box 85\1\ scan0218 | |
| Date | 19th October 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}26/KW.19.10.36. The material must then be passed to a sorter whose job it will be to pair off liners and drums so that the interferences are as stated, and he will be well advised to keep them down to the minimum permissible. He will start by sorting liners and cases into sizes. Any outsizes that will not marry up will have to be held over to the next batch. The liners will then be shrunk in before rust forms on the fine machined outside surface. The best way we have thought of to measure rapidly and accurately the liners' external diameter is as follows :- A stout steel bar, 1" dia., is machined with its ends square and total length equal to the ideal liner diameter. This gauge is used to set a micrometer clock fixed to a rigid stand at this height above a marking off table. The clock is adjusted to read some convenient figure, (say "75" if the liner diameter is 12.175). The liners are then rolled under the clock one by one four times each on different diameters. Thus an inspector should be able to measure up a batch of liners quickly. He must reject any that are not true cylinders. Will you please inform us if you consider this production process reasonable, or if you can think of a better way of doing the job. Hs{Lord Ernest Hives - Chair}/A.F.Martindale. | ||