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).
Guide to the machining of Electron metal, covering turning, milling, drilling, and grinding operations.
| Identifier | ExFiles\Box 142\4\ scan0126 | |
| Date | 19th September 1925 guessed | |
| MACHINING OF ELECTRON METAL. ------------------------ TURNING OPERATIONS. ------------------- 1. Use cutting angle 15 to 20 degrees. 2. Machine dry - use no lubricant whatever. 3. Cutting speed - 700/1000 feet per minute. NOTE that Electron possesses exceptionally good machining qualities and machining speeds are not limited by the metal, but by the fact that most machine tools are not constructed for such high speed, and vibration occurs above a certain rate. 4. Keep sharp edge on the tool. MILLING. --------- 1. Use cutting angle of 8 to 10 degrees. 2. Use milling cutter with widely spaced teeth, to ensure swarf clearing itself freely. 3. Employ cutting speed about 160 feet per minute. 4. Use no lubricant. DRILLING. --------- Cutting speed of 160 feet per minute. GRINDING. --------- Employ cutting speed of 160 feet per second. It is advisable to use wheels of medium grain and hardness. Fine grained wheels will clog too rapidly and coarse wheels give a rough finish. Grinding should be avoided wherever possible. 1. | ||