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).
The stress testing of a Pivot C.471 X.168, detailing its failure points and design.
| Identifier | ExFiles\Box 2\12\ B002_X168-page141 | |
| Date | 7th July 1913 | |
| From Exp. Dept. Copies for: Mr Johnson. Mr Royce. Mr Hadin. Wor{Arthur Wormald - General Works Manager}/2ly9/L7713. July 7th.1913. Report on test of Pivote C.471 X.168 This pivot was run on the reversal test rig at a speed of 750 single reversals per minute and broke after 78 hours running. Nine levers were broken during the test and lasted as follows :- 1. - 6 hours 45 minutes. 3. - 7 " 30 " . 4. - 4 " 30 " . 5. - 9 " 30 " . 6. - 7 " 30 " . 7. - 13 " 15 " . 8. - 5 " 30 " . 9. - 6 " 15 " . I attach hereto photograph showing the broken piece. It will be noticed that the circular part to which the oil catcher is fitted stiffens up the job and causes the breakage to occur round the bottom flange. This particular type has lasted considerably longer than any others previously tested. This is the type of pivot which is fitted to 500 and 700 series cars when it was desired to fit the large ball bearings to front wheels such as we are now using. I do not think there are very many cars with this partic- ular pivot fitted and probably most of the series of cars already mentioned are fitted with the small front hubs. | ||