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).
Production issues related to the anchorage and bedding of front brake shoes.
| Identifier | ExFiles\Box 5\3\ 03-page285 | |
| Date | 4th December 1929 | |
| x5420. To BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/R&S/MJ.4.12.29. X7420 x5420 ANCHORAGE OF FRONT BRAKE SHOES. A point has arisen on production in connection with brake bedding. It is found that when the brake shoes have been bedded the brake cannot be dismantled and re-erected without the bedding being altered. We have had a look at the job and in our opinion it is due to the way in which the fulcrum of the brake shoe is located and supported. In the first place the bolt carrying the fulcrum is located in a hole reamered in the aluminium back plate without any bush. This hole is reamered in a jig but if it happens to have been punched out of line, the plate is so thin that the hole can easily be pulled over by the reamer and in fact this does occur to a certain extent. Again, the bolt which supports the fulcrum is a black unground bolt which allows too much latitude on the dia. Finally, the end of the bolt which passes through the reamer hole in the inner plate is actually located on the thread. These three points mean that when fitted up new the fulcrum of the shoe can vary in position by an appreciable amount, and we think that they should all receive attention. The aluminium back plate is not quite what one would choose for a location of the brake fulcrum without some form of bush. We would point out that the jig on which these plates are reamered allows them to spring excessively which may also be the cause of inaccuracy. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||