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 bumping test of pivots for a stub axle.
| Identifier | ExFiles\Box 2\12\ B002_X168-page231 | |
| Date | 19th November 1912 | |
| Report on bumping test of pivots F3783/4 X/68 This pivot is the one with three recesses on the taper part of the stub axle and which has been standardised quite recently. A pair of pivots were run over 3" humps at 105 revs per min. The near side one broke after running 41 hours 6 min. The off side one has run 60 hours and is not yet broken. The first one broke off at the root of the stub. I think these tests are satisfactory and the pivot to be quite safe especially as the bore of the stub has been slightly reduced since the tests were made. The bore has been reduced from 1.33" to 1.312". | ||