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).
Extract discussing steering box mounting issues on 40/50 and EAC models and proposed solutions.
| Identifier | ExFiles\Box 38\1\ Scan165 | |
| Date | 29th April 1925 | |
| K32465 Extract from R1/M29.4.25. (X.8770 X.2565) STEERING 40/50 BUT PRINCIPALLY EAC. X.3430 X.3465 Both 40/50 and EAC. boxes require careful fitting to give easy steering, but I believe that the mounting of the EAC. box in the frame upsets the fitting, and the stresses cause the worm to cross-wind in its nut: this we are meeting by :- (1) We have sent Derby a fairly simple alteration to the mounting to avoid the stress, and absolutely preventing the mounting and stresses of the box in the frame distorting the alignment between the worm and its nut, which I have thought is the only way we can account for the variation from one box to another. (2) We sent a better flange to fix the steering column to the box (one has broken), but the modification in (1) may so reduce the strain that caused the original one to break. (3) We are making a design that will make careful alignment unnecessary, and want of alignment through faulty production or strain incapable of binding the nut and the worm (universal support). This will make all steering equally easy, and probably add to the life of the nut. So far as I can see this will go into the present box. Unless we are on the wrong track (1) should at once ease the situation equal at least to the 40/50., and (3) should give a good step forward, superior to anything. R.{Sir Henry Royce} | ||