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).
Report evaluating the performance of steering cams produced by Fellows Co., with comparisons to Adamant Eng: Co. products.
| Identifier | ExFiles\Box 153\1\ scan0004 | |
| Date | 10th August 1937 | |
| RHC.{R. H. Coverley - Production Engineer} for HH (crossed out) 1300 COPY. RHC{R. H. Coverley - Production Engineer}/A.MeW.1/Ls.10.8.37. RE STEERING CAMS PRODUCED BY FELLOWS Co. The above pieces have been measured for the regularity of the track at corresponding angular movements of the roller follower, also for the resultant radial movement produced by increasing backlash as the contact deviates towards the extremes of the roller travel. The results obtained from the former test shew the worms to be very good in this direction and compare favourably with the best examples produced by the Adamant Eng: Co. The figures recorded for the latter test indicate respectively as follows:- PHANTOM III. 17 TOOTH GENERATING CUTTER. The point of centre contact to be highly defined and backlash increasing at a rate larger than the present standard, but not greatly in excess at the extreme ends of travel. PHANTOM III. 16 TOOTH GENERATING CUTTER. The position of centre contact with a minimum of backlash extends over 90º each side the centre position and increases to a maximum much less than the standard product. This worm is exceptionally good. 25/30-HP. 16 TOOTH GENERATING CUTTER. It appears that the setting for grinding of the taper track has not been set to advantage as tightening of the steering would be resultant should this piece be used. With better care in setting the figures would have resembled typical Adamant products. The contact positions of the above pieces suggest an improvement of contact especially at the track extremes, but it is suggested, that as with the Fellows method of generation a radius exists at the root of the worm form, the follower should have an approximate radius of .050 at the corners to prevent interference. It may be pointed out that with the present pieces the sharp edges tend to contact at the extremes of the contact arc. continued. | ||