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).
Test results for white metal bearings, examining load carrying capacity in relation to speed and bearing length.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan030 | |
| Date | 15th July 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c.c. to BJ. Wor.{Arthur Wormald - General Works Manager} ✓ c.c. to RG.{Mr Rowledge} R.{Sir Henry Royce} c.c. to DA.{Bernard Day - Chassis Design} EY. ✓ ORIGINAL. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG15.7.26. WHITE METAL BEARING TESTS. +4633 Increase of load carrying capacity with decreasing speed. We have made a test on the 2.6" dia. bearings running them at 1150 r.p.m. This speed happened to be the most convenient for the test tackle, otherwise we should have run them at 950 r.p.m. We found that at this speed the bearings did not fail until a pressure of 1200 lbs/sq.in. internal projected area had been reached. | R.P.M. | Pressure/sq.in. internal projected area under which bearing fails. | |---|---| | 1900 | 450 lbs/sq.in. | | 1150 | 1200 * * | Oil press: 25 lbs/sq.in. Effect of length on load carrying capacity of bearing. We conducted a test to see if the greater length of the 1.40" dia. bearing was responsible for its load carrying capacity. We ran these bearings with their length reduced to 1.600". Under these conditions the bearings failed, under a pressure of 800 lbs/sq.in., thereby demonstrating that the length has not very much effect on the load carrying capacity of this bearing. contd :- Blueprint dimensions: 1.600, 2.600 | ||