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).
Reduction in thickness of brake drum backplates and associated distortion issues.
| Identifier | ExFiles\Box 120\1\ scan0282 | |
| Date | 6th February 1940 | |
| F.J.H We should have this information in the form of a short and instruct some thinner back-plates. Rm{William Robotham - Chief Engineer} 1028 X Rm.{William Robotham - Chief Engineer} c. to Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. to Rm{William Robotham - Chief Engineer}/MAR. BRAKE DRUMS WITH CAST-IN BACKPLATES. We have received your memo regarding the Casting-in of thinner backplates on the Brake Drums and your suggestion that you would like to reduce the thickness of these down to 0.100" thick. You will quite appreciate that there are distortion difficulties even with the thicker plates and as far as we can see there is no reason why there should be any excessive distortion with the thinner plates. The conclusion we arrived at in the experimental stages of this job was the fact that backplates should be pressed out of truth so that after distortion takes place they come into the correct shape to the drawing. From the point of view of fusion on the Cast Iron to the Mild Steel Plate we can see no possible difficulty with the thinner plate and we would suggest that the best idea is to go ahead and experiment with a couple of dozen of these having one or two of them sectioned up to ensure that the correct fusion has taken place. Vs.{J. Vickers} | ||