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).
The experimental testing of battery ignition contact breaker levers and the correct method for fitting tungsten points.
| Identifier | ExFiles\Box 35\6\ scan 404 | |
| Date | 21th March 1928 | |
| To RHC.{R. H. Coverley - Production Engineer} from EFC. c. BY/RD. X2894 EFC3/T21.3.28. TUNGSTEN POINTS. Herewith we hand to you three battery ignition contact breaker levers duly fitted with tungsten points by the Tungsten Manufacturing Co. (our standard suppliers are Messrs. Reynolds). We should be pleased if you would have these firstly fitted with the necessary bushes and spring anchor pins, electro-tinned, and thirdly fitted with rubbing blocks, and finally pass them back to us for experimental test. Will BY/RD. please note in this connection that the Tungsten Manufacturing Co. give the following instructions for riveting tungsten points to levers, heading the matter IMPORTANT :- "Where it is necessary to fix tungsten faced rivets on to springs or plates, it is important that they should not be riveted with central punch or hammer or any method subjecting the tungsten face to blows. The only satisfactory method is by spinning with a machine having rotary-- rollers. Where the user has not the necessary machine we shall be pleased to undertake this operation at a nominal charge." It is understood that the levers that are now being handed to RHC.{R. H. Coverley - Production Engineer} have had the points fitted by the spinning process recommended by them. It would appear that any other method than this is, in the opinion of the Tungsten Mfg. Co. unsatisfactory in regard to breaking and cracking of the tungsten points. EFC. | ||