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).
Improvements to the fitting process of brake linings.
| Identifier | ExFiles\Box 92\4\ scan0317 | |
| Date | 7th April 1937 | |
| To RV. from HRO/Cy. C. to HW. (crossed out) C. to R.{Sir Henry Royce} (crossed out) C. to DB.{Donald Bastow - Suspensions} (crossed out) C. to EB. (crossed out) C. to HH. (crossed out) C. to EH. (crossed out) C. to WH. (crossed out) C. to RM{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} 306 AFM{Anthony F. Martindale} File RE FITTING OF BRAKE LININGS. After consideration of the job, we find that much improvement can be effected by attention to the following points. We have looked into the drilling of the Ferodo Linings and instructed Ts/DH.{D. Henderson - Showroom} to improve the drill jig to ensure full face contact on the inside surface of the lining. There is no doubt that to machine the periphery of the shoe will greatly improve the job particularly in the case of the auxiliary brake shoes which are at present glazed. If the surfaces are all machined we do not consider it necessary to stretch the liners as suggested by RM{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} during rivetting. The question of repairs must be considered and we feel it to be safer to issue liners which can be fitted direct, as the stretching is a variable quantity and may not be successful. We would prefer to clamp up the liner to the shoe during this operation to remove any spring. All burrs should be removed from both sides of holes, solid rivets are to be preferred to the hollow type. The hollow type rivet is quite successful on sheet metal work where the thickness of plate work is fairly constant to ensure just the correct amount of turnover. Ferodo liners and brake shoes do not fall within this degree of accuracy, and there is a possibility of the rivet being closed without gripping the liner. The clearance of .100 between the inner edges of the shoes does not always obtain(Ph.III.) due to various machining errors, these have been outlined in my memos HRO/Cy.S/LS.1.4.37. and all concerned have been instructed to take the necessary action to prevent this trouble. Therefore, to cure these complaints we should machine all shoes, including auxiliary shoes, on the outer periphery, use solid rivets, improve drill jigs for Ferodo, | ||