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 Adamant Engineering Co. Ltd. discussing manufacturing methods and issues for steering cams.
| Identifier | ExFiles\Box 153\2\ scan0206 | |
| Date | 12th December 1936 | |
| F.J. HARDY 1300 B. RHO. [Text Struck Through] C. Rm.{William Robotham - Chief Engineer} [Text Struck Through] C. Mr. Goodall (No.2 Inspection) [Text Struck Through] C. Mr [Text Struck Through] C. ROY.{Sir Henry Royce} [Text Struck Through] 12th. December 1936. BY.1/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Messrs. Adamant Engineering Co. Ltd., Dallow Road, LUTON. Dear Sirs, STEERING CAMS. As a result of the visit of Mr. Goodall and myself to your factory, we returned to Derby with the two fold object of :- (a). Seeing whether by setting up a cam as you suggested without any pre-loading on the bearings, finding the two high spots, making these central with the central axis, and then building the steering gear up completely and submitting this to our Test Department, the result was that it has been definitely agreed that we cannot permit the large amount of idle movement which takes place on the steering wheel rim with this method of erection. (b). We have tried the second scheme viz. trying to find an eccentric axis which would permit the cam being set up with only one tight position and that in the middle. Here again we have failed, mainly owing to the fact that the eccentricities are not on the same axis, the eccentricities at the two ends being removed from one another angularly by as much as 120°. In view of these facts we must go back to the suggestion put forward by Mr. Goodall during his first visit and reproduced by myself at our recent visit without knowing that Mr. Goodall had made a similar suggestion, the suggestion being the production of a spigot at each end of the cam which must run true with the bore from which the worm will later be generated. Having produced the two spigots at each end from the ground bore, these ground surfaces must be checked at every operation to ensure that the worm is running true with the ground bore. In other words for each several operation following the original one of producing from the ground bore the two locating | ||