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).
Steering worm and nut combinations to control reversibility.
| Identifier | ExFiles\Box 17\3\ Scan151 | |
| Date | 11th May 1927 | |
| To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to BY.{R.W. Bailey - Chief Engineer} DA.{Bernard Day - Chassis Design} +7430 R2/M11.5.27. STEERING. X.8430 X.7430 I want you to be very definite in not coming to any conclusions about steering irreversibility unless the steering worm and nut are quite free in the fitting and a reasonable bedding, and polished worm. So far I understand that the .720 worm and large nut is still too reversible when free. We have therefore sent you a still larger worm, and slightly slower pitch to carry the reversibility definitely further. It will be quite easy to retrace our steps if we have gone too far. So that talking of nothing but really well used and free steering, you have - (1) The .720 worm with the original larger worm, and (2) This same worm with slightly slower pitch giving slower steering, and slightly more reversibility, and now we give you (3) a still larger worm with about the same slower steering. Finally we may expect you to prefer this largest worm with .720 pitch. In addition to this, DA.{Bernard Day - Chassis Design} has sent you a new thrust bearing for the steering column which embodies an easily adjustable and constant amount of definite mechanical friction. This design embodies some points which may be valuable, and should be patended by a provisional in England pending greater experience. R.{Sir Henry Royce} | ||