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).
Proposal for modifying the rear shock damper and roll bar connections for the Wraith II model, moving from knurled stems to broached holes and rolled serrations.
| Identifier | ExFiles\Box 9\8\ 08-page04 | |
| Date | 12th November 1936 | |
| 1044 LES 64~ BY.{R.W. Bailey - Chief Engineer} c. Rm.{William Robotham - Chief Engineer} RMC. Da.{Bernard Day - Chassis Design}1/HP.12.11.36. Rear Shock Damper and Roll Bar Connections. Wraith II. The proposed method of fixing ball ends into levers, etc. by forcing the knurled stem of the ball end into a plain hole in the lever is not likely to prove successful, and it is proposed to try broaching the hole before pressing the stem in, as is now done in America. It is understood that rolling is still considered a practical way of making the male serrations, and accordingly a large number of fine serrations is still to be used, though rather deeper than the original knurling. The proposed serrations are shewn on LeC.5375 herewith, and Experimental Department are now engaged in producing for test purposes a sample of the 60 T. joint shewn on the R.H. side, so that its load capacity may be ascertained for comparison with the joint which failed. This test joint will be made by milling and slotting. It will be necessary to modify the instructions on all the joints of this line now called for on Wraith, and as soon as satisfactory results have been obtained from the test, we should be glad if BY.{R.W. Bailey - Chief Engineer} would do this. Joints affected. Ball end for rear roll bar and shock damper connections, upper and lower LeC.5133. Roll Bar Levers and Roll Bar LeC.6133. Bracket for shock damper connection to rear spring pads. LeC.5133 and LeC.5302. Roll Bar Lever and Roll Bar N.Sch.4850. Also Phantom III piece LeC.4995, LeC.5292, N.Sch.4880. Da.{Bernard Day - Chassis Design} | ||