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).
Continuation of a report detailing strength testing procedures for a Cross Steering Tube Ball Joint.
| Identifier | ExFiles\Box 80\1\ scan0028 | |
| Date | 22th April 1916 | |
| 3. Cross Steering Tube Ball Joint Contd. job as good a/of it as possible (flange well in contact and shank a tight fit). We assume that the strengthened steering levers are now strong enough to break the sphere. If not a stronger lever should be hand-forged. (d) The three levers are now tested on the wobbling test, which should be speeded up considerably to put a greater stress on the sphere. (c) It should be noted:- (i) Whether the new-type sphere is stronger than the old. No. of repetitions each stands. (ii) Whether the .025" press fit allowance is suffic-ient to ensure the sphere breaking off at the neck before it works loose, or whether it will be necessary to use .050 press fit allowance. (iii) Whether the bosses of the new levers burst under the stress. For this reason the boss and neck of the hand-forged lever should be machined and filed up to the dimensions shown on LeC.537. Exp. 11. If the wobbling test fails to give satisfactory results, through the breaking up of other parts, for example, the experiment may be conducted thus:- The levers are bolted to a block of iron and two tups are suspended equally each side of the ball. Each is lifted alternately to an equal and constant height, and there-fore comes up against the ball with equal force each time from alternate directions. The blow should not be sufficient to break the ball at once, or it will tell us nothing, but after [Handwritten note next to a sketch: Important part of lever] [Footer text, upside down]: R.R.A 235 (400 T) (S.C. 636. 15 2-16) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1546. | ||