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 Ferodo brake liners and riveting for Phantom III and Wraith models.
| Identifier | ExFiles\Box 141\1\ scan0227 | |
| Date | 4th January 1937 | |
| 1180 To By.{R.W. Bailey - Chief Engineer} E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to RHO. c. to HPS.{Horace Percy Smith - Experimental Factory Mgr} Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}1/JH.4.1.37. Ferodo Brake Liners. Since we discussed the Phantom III brake liner situation in your office, we have rivetted two pieces of Ferodo to Wraith brake straps, one piece with only .062 of liner below the rivet head, the other with .090" below the rivet head. The latter is unquestionably the better job, the Ferodo being in much firmer contact with the shoe. Both the Works and the Experimental fitting shop are urging that the amount of Ferodo below the rivet head should be increased to .080 + 10 and as this will not appreciably alter the life of the lining, we should like all future supplies made accordingly. We also think the number of rivets in Phantom III main shoes should be increased from 10 to 12 at the first convenient opportunity, so as to bring them into line with Phantom II and Wraith which we think are better jobs. This will help Works to raise the production standard, although their present troubles are due to bad drilling. As regards Wraith shoes, although the spacing of the rivets is good the design is such that bifurcated rivets cannot be used, and these are both cheaper and better. The front shoes can easily be altered so that bifurcated rivets can be used by the addition of small platforms on the taper side of the outer shoe flange to receive the rivet heads. We think this should be done at once before dies are sunk. As regards the rear, we are writing to Aylesbury to see if they can supply us with an anvil, which when used with a modified rear shoe, will enable us to use semi-tubular rivets. We should like all future aluminium shoes designing so that the Ferodo can be fixed on, on the Bifurcated rivetter. Rm{William Robotham - Chief Engineer}/A.F.Martindale. | ||