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).
Tests conducted on 2.6' diameter white metal bearings to determine creep under alternating loads.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan157 | |
| Date | 15th September 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BJ. Wor.{Arthur Wormald - General Works Manager}✔ c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer}✔ c. to BY.{R.W. Bailey - Chief Engineer} AJS.✔ ORIGINAL Hs{Lord Ernest Hives - Chair}/RmS/LG15.9.26. XL4633 WHITE METAL BEARING TESTS. 2.6" DIA. BEARINGS. We have conducted a test to determine the unit pressure at which a fully floating white metal bearing will cease to creep when run under alternating loads. The test was carried out on a shaft having two bearing diameters .125" eccentric, the eccentricities being set at 180° to each other. This was in order to reduce unbalanced forces and consequently vibration when running under heavy loads. The load was suspended by a 6 ft. rod beneath the bearing, so that its position was substantially vertically below the shaft at all speeds. The shafts were run at 515 r.p.m. and loads increased by 100 lbs. starting from 600 lbs/bearing. Up to a load of 1600 lbs. the bearings shewed some reluctance to start creeping when starting up from cold, it being necessary to relieve the load. Having once started, however, they continued to creep indefinitely. An endurance test was run at a load of 2000 lbs/bearing for 8 hrs., during which time the bearings 'crept' consistently. At the end of the run the bearings were in good condition. The bearing creep was measured with the arrangement shewn in the attached sketch - the Chronograph being employed to obtain te contd :- | ||