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).
Design specifications for front pivots, focusing on weight reduction, strength, and bore dimensions.
| Identifier | ExFiles\Box 2\12\ B002_X168-page049 | |
| Date | 25th May 1928 | |
| From F.H.R., Copies sent to: Mr. Johnson. Mr. Wormald. Mr. Spinney. [STAMP: RECEIVED 25 MAY 1928] Front Pivots. We must not make these front pivots heavy and we must not forget that it is no use their being much stronger than the cross tube or the spherical joints. I think perhaps, that it would be better if the cross steering tube were the weakest point. You will also notice from the stub axle that it can be considerably lighter without being any weaker, in fact, if it is made of uniform strength it will be stronger. It should be bored out parallel to suit the 2.125 diameter, then another part parallel for the 1.968 size, then taper until it reaches the point which is 1.375 diameter, then parallel again by drilling until it approach es the screwed part. The weakest spot is now where it is bored 1.437 and ground for the larger ball-race 1.968. I think that it will be most practical to take this dimension which I work out to be .531 as the difference between the inner and the outer bore. This will make the parallel bore at the small end .844. F.H.R. [Handwritten note:] Mr Wormald. See Blue Print returned. X168 | ||