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).
Design and testing of serrated pressed fits for levers and ball pins on Wraith II and Phantom III models.
| Identifier | ExFiles\Box 151\2\ scan0323 | |
| Date | 2nd March 1937 | |
| To BY. {R.W. Bailey - Chief Engineer} From Ev. {Ivan Evernden - coachwork} Copy to Be. Rm. {William Robotham - Chief Engineer} RHC. {R. H. Coverley - Production Engineer} HPS. {Horace Percy Smith - Experimental Factory Mgr} Rm {William Robotham - Chief Engineer} Les. {Ivan A. Leslie} WS. 1292 E {Mr Elliott - Chief Engineer} /Ev. {Ivan Evernden - coachwork} 1/MN.2.3.37. Re Serrated Pressed Fits For Levers and Ball Pins. On various schemes for Wraith II and Phantom III we have called for levers to be fitted to shafts, and ball pins to levers, by means of a serrated pressed fit. Tests on serrated shafts pressed into plain bores have been made and the scheme has been found to be not altogether satisfactory. On LeC.5375 we gave designs for machined serrations, and whilst for the experiment we realised they would be cut by milling and slotting, it was and still is intended that on production they would be cut by internal and external broaches such as are used by Gordon Armstrong on their shock damper. This scheme has been tested and reported on in HPS. {Horace Percy Smith - Experimental Factory Mgr} 2/VS. {J. Vickers} 6.2.37 (No copy to BY. {R.W. Bailey - Chief Engineer} ) It would appear that with either .015 or .005 interference equally good results were obtained and we suggest that we go for the smaller interference with a fairly wide plus limit. Would you kindly apply this design of serration to all parts where a pressed serrated fit has been called for. The schemes showing parts involved are given in Da. {Bernard Day - Chassis Design} 1/HP.12.11.36 - addressed to BY. {R.W. Bailey - Chief Engineer} Ev. {Ivan Evernden - coachwork} | ||