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 detailing the performance of an Acme thread lubrication scheme for a Bentley steering worm at different temperatures and speeds.
| Identifier | ExFiles\Box 86\4\ scan0092 | |
| Date | 28th May 1934 | |
| GRAPH II "ACME" THREAD LUBRICATION SCHEME USING F58296 BENTLEY STEERING WORM. MOTORINE "C" 30° & 60°C TEMPERATURE. EFFECTIVE LENGTH OF THREAD L=2" .002" DIAMETRAL CLEARANCE SLEEVE DELIVERY PTS/HR. SHAFT SPEED R.P.M. PRESSURE LB/SQ" PRESSURE 0 LB/SQ" { 30°C 60°C } PRESSURE 5 LB/SQ" 30°C PRESSURE 10 LBS/SQ" 30°C PRESSURE 5 LBS/SQ" 60°C DELIVERY PTS/HR 2000 R.P.M. 30°C 2000 R.P.M. 60°C 1500 R.P.M. 30°C 1500 R.P.M. 60°C 1000 R.P.M. 30°C 1000 R.P.M. 60°C 500 R.P.M. 30°C 500 R.P.M. 60°C | ||