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).
And diagrams illustrating the design and behavior of a 1st speed gear, including the effects of the quenching method.
| Identifier | ExFiles\Box 126\2\ scan0087 | |
| Date | 26th August 1938 guessed | |
| Selector fork Selector Shaft Wall of gearbox gear prevented from overshooting by selector fork contacting wall of gearbox MODIFICATIONS SHEET CLASS DATE SGN VERY SMALL HELICAL ANGLE CONTACTING TOOTH ON LAYSHAFT CLUSTER DRIVING FROM ENGINE. RESULTANT THRUST TENDING TO KEEP GEAR IN MESH WHEN ENGINE IS DRIVING 1ST SPEED GEAR SHEWING IN EXAGGERATED FORM THE TAPER OBTAINED BY THE QUENCHING METHOD 1ST SPEED GEAR. Clearance at bottom is about .010" a slight lift is given to plug Gear is heated up in cyanide bath in heavy metal jig + then is quenched white hot in jig Large mass of metal causes one end of gear to be delayed in cooling & thus causes bore to be slightly taper HUMBER-HILLMAN COVENTRY. SK. | ||