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).
Abrasives and grinding methods, covering material types, wheel developments, and lubricants.
| Identifier | ExFiles\Box 142\4\ scan0136 | |
| Date | 10th December 1926 guessed | |
| 5 ABRASIVES (Norton Co) "It has been said that a Ford manufactured by former methods would cost as much as a Rolls Royce does now, were it not for grinding. "In 1904 five hours were required to turn, make fillets and file the four pins of an automobile crankshaft. Today grinding methods produce a better produce in 5 minutes." "The grinding machine is the only tool known which is capable of producing in the material being shaped the accuracy that has been built into the machine tool itself." "The aluminous abrasives are intrinsically tougher which makes them more suitable for grinding steel and other tough materials of high tensile strength. "Silicon carbide is somewhat harder but more brittle, and of most use for grinding the weaker metals. - (Description of development of artificial aluminous abrasive for optical glass - replacing emery.) (Description of Bakelite-bonded wheels replacing shellac-bonded wheels for ball bearings (20 times the life) gear grinding Cutting off valve stems Cutting off carbon brushes Cutting off tungsten electrical contacts (Wheels only .015" thick.) (Description of development of water-proof sandpaper for automobile finishing etc.) EFFECT OF LUBRICANTS. "When grinding aluminum just as when machining it, lubrication with a mixture of kerosene and lard oil gives a smoother and more efficient grinding action. "With dry-grinding a lubricating effect may be obtained by impregnating the grinding-wheel itself with materials that soften at the surface of the wheel under the heat of grinding." OY MO/R Maurice Olley | ||