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).
Proposed testing procedures for steering gear components.
| Identifier | ExFiles\Box 20\2\ Scan013 | |
| Date | 12th April 1912 | |
| Mr Wormald. Le CanadelHenry Royce's French residence 12th April 1912. C.J. and Technical Committee. Re test of steering gears (completed) X963 4609 In testing to find if the various parts are good and sound, we will remember first that the breaking test piece on every sphere should be carefully watched by a reliable inspector, as this is one of the most treacherous parts of the whole apparatus. The next part requiring careful attention seems to be the testing of the forgings. No serious money need I think be spent on this until they have passed through their heat treatment. Then 2 1/2% to 5% of the pieces should be broken to satisfy the inspector that the heat treatment is correct for the material, and to detect any sign of brittleness that would not be found by any other test that suggests itself to my mind at present. Then an apparatus should be provided that would enable the inspector to load each part alternately in either bend or torsional directions to a stress equal to from 60% to 80% of the elastic limits, the piece being attached to a shaft which is capable of being turned through a complete circle. After the load is applied in each direction something should be provided capable of detecting any permanent deflection. Such a test I think would open out any serious flaw, and would show up any soft material. It | ||