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 manufacturing and finishing processes for vehicle gears, including burnishing, grinding, and potential design alternatives.
| Identifier | ExFiles\Box 104\4\ scan0093 | |
| Date | 20th January 1932 | |
| (2) RHE4/BE20.1.32. The continuous and third speed gears are the original spiral angle 32°-7', and the degree of silence necessary has been obtained by burnishing. The gears fitted to the experimental boxes have been shaved after carburising to eliminate distortion. For production purposes, gears should be ground, as this operation will be more economical than shaving, and will give correct tooth form. Even with grinding however, it is necessary to burnish to give the necessary finish and silence. Burnishing is done by driving alternate gears and the driven gear in each case is traversed across the driving gear. The speed of traversing is unimportant, so long as gears are not allowed to dwell. It will be necessary for the Tool Office to deal with equipment for the burnishing operation of gears on a productive basis. The most satisfactory powder or compound is Wellworth's No. M.304, which is not exactly an abrasive, but more of a polishing compound. The gear for reverse driving shaft G.55277 is forced on to sleeve G.55193, then drilled in position for six taper pegs. This is not only costly, but a difficult operation as the holes for the pegs are blind and reaming is a difficult process. Could it be arranged as an alternative to use shallow splines or serrations? RHC.{R. H. Coverley - Production Engineer} | ||