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).
Knocking, wear, and lubrication issues concerning the 20HP Mechanic's Joints.
| Identifier | ExFiles\Box 48\1\ Scan089 | |
| Date | 31th August 1928 | |
| To Hr. From RHC. {R. H. Coverley - Production Engineer} c.to Hs. {Lord Ernest Hives - Chair} 74183 RHC {R. H. Coverley - Production Engineer} 1/BE31.8.28. RE: 20HP. MECHANIC'S JOINTS With reference to the mechanic's joints in accordance with N.S. 2589, which were fitted to 12-G-IV. When these were being assembled it was observed that one crosspin provided axial location. This we considered would allow joints to knock when car was in motion, and arranged for both pins to be provided with axial location. Complaints have since been received that joints were knocking during test. On examination it was found that certain wear had developed on joint casings which allowed axial movement to take place. These casings are made in mild steel. It would appear that harder material is required to prevent wear taking place. It was also observed that joints were perfectly dry, and did not appear to have been lubricated. One small lubricator is provided and the size of hole is such that, when attempting to fill with oil, the syringe would block up the hole and prevent air escaping, thus preventing oil being fed into the joints. It would be advisable to provide either a larger size of lubricator plug or an additional lubricator which should be released when loading with oil, to allow the air to escape freely, and ensure joints being properly lubricated. RHC. {R. H. Coverley - Production Engineer} | ||