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).
Letter to The Hoffmann Manufacturing Co. Ltd. discussing methods of cold drawing wire to improve the properties of ball bearings.
| Identifier | ExFiles\Box 153\4\ scan0003 | |
| Date | 18th July 1939 | |
| - 2 - 18th. July 1939. The Hoffmann Manufacturing Co.Ltd., Chelmsford. be possible to reduce the significance of the fibre structure relative to failure by starting to cold draw the wire from a larger diameter of rod, and in fact our final arrangements were to produce the final size by a reduction of the ratio of 12 to 1 on area, as an example, 9/16" wire has 50 thous. ground off it before starting to draw, finishing up by drawing operations to .128" diameter. In thinking this matter over it would appear that the reduction of the relative significance of the fibre line by extenuating it by its reduction in cross section would result in balls being :- (a). Very much more alike in regard to load carried. (b). The actual load carried would be materially increased, and would rather commend this aspect of the matter for your consideration. Yours faithfully, FOR ROLLS-ROYCE LIMITED. By CHIEF ENGINEER - CHASSIS. | ||