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).
Letter to Vandervell Products Ltd. regarding the groove dimension for rocker bush EB.4733.
| Identifier | ExFiles\Box 115\2\ scan0436 | |
| Date | 28th March 1939 | |
| 1020 Experimental Dept. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}10/MH.{M. Huckerby} 28th. March, 1939. Messrs. Vandervell Products Ltd., Western Avenue, Park Royal, LONDON, W.3. For the attention of Mr. Johnson. Dear Sirs, We thank you for your letter of the 27th. inst. in regard to the grooving of the rocker bush EB.4733. We note you have based your groove dimension, i.e. .790/.770 dia. and depth .015/.020 on a bore dimension of .734 dia. We would point out, however, that this bore has to be reamed out to .750 dia. which is shown on the drawing EB.4733, and which would leave a groove depth of .008 - .015. Actually, the figure we quoted for the diameter of the groove .790 would give a groove depth of .020"; however, we note that this would penetrate too deeply in the steel. Under the circumstances, therefore, we would like you to give us your opinion as to what diameter of groove we could go to without any risk to the bush, which we will incorporate on our drawing. Yours faithfully, for ROLLS-ROYCE LTD. | ||