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).
Modifications to the India Gearbox to allow for the lowering of floor-boards.
| Identifier | ExFiles\Box 6\4\ 04-page161 | |
| Date | 2nd March 1936 | |
| 40-R.{Sir Henry Royce} FROM AJS. ORIGINAL Y5310 AJ81/M2.3.36. C. to - BY.{R.W. Bailey - Chief Engineer} CC. HS.{Lord Ernest Hives - Chair} RAVEN INDIA GEARBOX. MODIFICATIONS TO ALLOW FLOOR-BOARDS TO BE LOWERED. Y5310 FES We send herewith drawing LeC. 2205. (original to BY.{R.W. Bailey - Chief Engineer} print to R.{Sir Henry Royce}) shewing modifications made to allow a height of floorboards of 2" from the frame top. The hatching in red on the drawing in two different views indicates the amounts in height that have been gained by the following modifications, which now allow floorboards needing only a very small amount of cutting. The modifications are:- (1) The machining of the two main cover facings .125 lower than standard. (2) Making covers thinner. (3) Substituting jointing consisting of .010 to .015 Valumoid in place of .032 red fibre. (4) Using .250 x 1.BA. studs in place of .312 x .250. (5) Making pendulum change lever solid with spindle and allowing interlock lever operating cheeks to be made lower in consequence, and also to eliminate large boss. (6) No.(1) has necessitated slight modifications to casing and also that covers be arranged as (A) and not as (B). (A) (B) to allow milling the faces at different levels conveniently on a twin head plano miller. (5) has allowed this to be done together with moving the large faces .050 towards the near side of the car. (7) No.(6) necessitates making alterations to the centring spring arrangement on change lever shaft. These have already been discussed with R.{Sir Henry Royce} At bottom R.H. corner we shew an alternative scheme for the interlock lever cap in which the top of gearbox is machined all at one level. We consider that this scheme is so much better from a manufacturing point of view that it SHOULD BE TRIED FIRST, as the possibility of easier oil leakage with it is remote. The pattern for casing can easily be made to accommodate both the ideas as shewn. The top holes for change lever shaft bracket securing studs are dropped .100 in the alternative scheme, but elongated bosses could be made for the first experiment. AJS. | ||