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).
Stress test report on an undersized steering pivot to determine if it should be scrapped.
| Identifier | ExFiles\Box 2\B002_X168\ 00000001-page102 | |
| Date | 25th May 1913 | |
| From Eng. Dept. Copies for: Mr Johnson Mr Royce Mr Hadin Mr Hpinney Nor/Hyls/166013. May 25th.1913. x168 Report on test of Steering Pivot P.3253 This pivot is one of the strengthened type, but has been rejected by the inspectors on account of its being .01" under limit in the thickness of the vertical part on the stub axle. [Drawing of a pivot with an arrow pointing to a section labelled 'Thin here.'] The test was made on the reversal test rig, the object being to see if being thin in this spot weakens the pivot very much and to help us to decide whether they should be scrapped or not. We have about 50 pivots which are from .01" to .02" under size at this point. The crank which oscillates the pivot and road wheel was driven at an average speed of 375 revs per minute thus reversing the stress 750 times per minute. The pivot ran for 42 hours 26 minutes before it broke. It cracked at both sides fairly equally and quickly broke off. This test does not show that the job is weaker by being thin as this particular pivot has lasted about 3 hours longer than one of correct thickness which was tested some | ||