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).
Technical memorandum detailing issues and adjustments for front brakes, specifically concerning wear on linings, levers, and ropes.
| Identifier | ExFiles\Box 5a\3\ 03-page291 | |
| Date | 15th June 1933 | |
| X5840 Hotel de France. Chateauroux. Indre. 15.6.33 To Hs{Lord Ernest Hives - Chair}/Gry{Shadwell Grylls} From G.W.H. 18. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} IV. Front Brakes We have received your memo Hs{Lord Ernest Hives - Chair}/Gry{Shadwell Grylls}/KT 13.6.33. We appreciate your efforts and do not doubt at all of what you say, works out admirably on paper, unfortunately in practice brake linings are apt to wear rather quickly and with one notch of wear to put your brakes out of action does not seem to be quite as it should be. The position is this: 1st New brake ropes were not required, neither were they slack, after fitting the shorter levers. If you lay it out on paper you will realize that the arc of the shorter levers requires actually longer ropes ie. .275". 2nd The plate lever was so set that actually the jaw was fouling in the off position. We reported that to get this we had to turn a bolt round on the equalizing shaft, here. 3rd One notch of wear allows .375 Movement of lever on toggle shafts, which equals .875 movement with the necessary .500 initial movement, you can start out for a run with .625 or .750 movement, and before the day is out, you have no front braking. 4th With the same amount of brake wear the arc of the shorter lever is approx. half as much again. 5th We have obtained a much better lay out by fitting a plate lever 2.150 keeping the original 1.625 levers We measured the short levers as being 1.3125 centres you state 1.350 actually they are 1.343? [Signature] G.W.H. | ||