Part manufacturing strategies, sub-contracting, and determining component tolerances and clearances.
| Identifier | ExFiles\Box 76\2\ scan0076 | |
| Date | 1st January 1918 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. Contd. -2- P4/W5.1.18. ---------- least as concerns such parts as are part-contracted for outside. (5) That most of the factories such as Standard and Clement will require a portion of their allotted work to be in heavy parts and a portion in light parts and some departure will probably have to be made from the basic rule laid down in suggestion (1), also one should consider that in certain cases units such as pumps, wheelcases, cam-cases, con-rods, should be produced complete ready for assembling at our, or the Clement Talbot factory. One feels for instance, as though the standard Co. should in addition to making the water pump, make the drive for the water pump, and possibly part of the piping in connection with the water pump i.e., associated parts which will give the necessary variety to absorb their varios classes of tools and labour. (6) The question of tolerances and clearances is I am fully aware a very difficult one and I suggested some time ago that Mr. Hives should test every part of the engine to find out to what limit of slackness the part could become before it could be called scrap. Firstly, we ought to ascertain the necessary clearances, then the allowable clearances and the rate of wear as far as is possible would tell us what tolerance is permissible. For instance, we suggested that the Water Pump Drive gear-wheel and the Oil Pump bronze worm wheel could have say .01 backlash in the teeth. This I think would be an immense benefit if it could be carried out especially if it could be ascertained promptly and taken advantage of at the present moment, even if only a limited number of parts could be dealt with it would be helpful. We hope to send further notes later. R. {Sir Henry Royce} | ||
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).