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).
Graph from 'Acme Thread' lubrication tests on a Bentley steering worm, plotting delivery against shaft speed and pressure at different temperatures.
| Identifier | ExFiles\Box 86\4\ scan0093 | |
| Date | 28th May 1934 | |
| GRAPH III "ACME THREAD" LUBRICATION TESTS USING F.S.B.296 BENTLEY STEERING WORM. .002" DIAMETRAL CLEARANCE SLEEVE MOTORINE "C" 30° & 60°C. TEMPERATURE. EFFECTIVE LENGTH OF THREAD L=1" DELIVERY PTS /HR. PRESSURE 0 LB/D" 30°C 60°C PRESSURE 5 LB/D" 30°C SHAFT SPEED R.P.M. DELIVERY PTS /HR PRESSURE LB/D" 2000 R.P.M. 30°C 1500 R.P.M. 30°C 1000 R.P.M. 30°C 60°C 500 R.P.M 1000 " 1500 " 2000 " | ||