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).
Test results on sleeve clearance, pressure stabilization, and temperature effects on delivery.
| Identifier | ExFiles\Box 86\4\ scan0089 | |
| Date | 31th May 1934 | |
| -2- Decreasing the sleeve clearance, whilst increasing the free delivery did not increase the maximum pressure, in fact it had a tendency to reduce the pressure with the longer thread. Actually, with the .002" sleeve clearance the pressure built up to the same level as the .010" sleeve, and then stabilized itself at a lower pressure. Using only 1" thread the pressure rose slightly higher with the .002" sleeve than the .010" sleeve max. pressure, and then became stable at approximately the same level. This stabilization of pressure was not observed with either the .010" sleeve, nor when the temperature was increased from 30°C. to 60°C. with the .002" sleeve. Increasing the temperature from 30°C. to 60°C. whilst not affecting the free delivery too seriously, caused a large reduction in delivery under pressure, and also the max. pressure. Finally, these tests prove that shafts can be lubricated by this method, but not under any great pressure, although it might be possible to improve this feature by reducing the pitch. Hs{Lord Ernest Hives - Chair}/W.Bell. | ||