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).
Instructions regarding the modification and fit of parallel and taper bore pinion serrations.
| Identifier | ExFiles\Box 6\4\ 04-page132 | |
| Date | 19th May 1925 guessed | |
| -2- and fully engaged. The parallel serrations we think ought not to creep. If they do we want you to shorten the serrations to something less than the length of the teeth on the gear. If the control is poor we can grind up the top of the serrations on the shaft, and fit a bush at each end of the pinion so as to give a satisfactory diametral fit. To be sure we know what we are doing we should like the engagement of the gears, and the beginning of the serrations in the bore of the pinion to be level, that is, not counting the rounded portion of the gear, and referring to the parallel pinion and parallel shaft. The pinion with taper bore serrations we want to be as long as possible. If you do not come to a definite result, the pinion with taper bore could be chambered so as to give two narrow lines of teeth separated by a space. Such a gear we expect will creep one way or the other, and we should like to know whic. way, that is, whether it creeps towards the larger end of the bore or the smaller end. You will notice that this is a little bit different to your experiments with a taper in the diametral fit. This has taper in the keys and not diametral fit. R.{Sir Henry Royce} [Stamp] 1804 MADE AT CROXLEY | ||