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).
Specifications and production of Bentley Aluminium Brake Drums.
| Identifier | ExFiles\Box 85\1\ scan0139 | |
| Date | 17th July 1936 | |
| To By.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}12/KW.17.7.36. Bentley Aluminium Brake Drums. We understand from E.{Mr Elliott - Chief Engineer} that you will be producing the production drawings of the above from our Ex. drawings. We therefore attach hereto a set of 5 prints from which we have made the experimental front aluminium brake drums, which will be running 10,000 miles in France on 6-B-IV. The rear drums running will be to N.Sch.4796. In our latest drums the screw dowels shown in Rm.{William Robotham - Chief Engineer}55 are not used and the dovetailed locking plates Rm.{William Robotham - Chief Engineer}176 secure the liner both against rotation and working out sideways. The rivets holding the locking plates are in mild steel: their heads bear on an oval reinforcing plate. These locking plates are fitted after the inner surface of the drum has been turned. On the advice of the laboratory the latest front drums have been made in R.R.53c alloy. This is said to give additional strength. We are running these drums with steering levers GB.2059/60 and steering joints to N.Sch.3848. The clearance between drum end plate and pivot is very small, because for experimental purposes we did not wish to go to the expense of new hubs. We have no objection to a slight modification to the inner part of this end plate to give increased clearance as such modifications do not appear to affect the strength of the drum. The liners we are using are in "Millenite" with .026" to .030" interference: drums are raised to 200°C. to insert same. Hs{Lord Ernest Hives - Chair}/A.F.Martindale. | ||