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).
Testing two bearing alloys for positions with intermittent or scanty lubrication.
| Identifier | ExFiles\Box 120\2\ scan0249 | |
| Date | 2nd December 1937 | |
| File 1029 Mr. Martindale. H1.5/JN.2.12.37. 1206 Laboratory BEARING ALLOY FOR A POSITION WHERE LUBRICATION IS INTERMITTENT OR SCANTY. Two alloys were tested at a speed of 360 ft. per minute against C.H.N.S. ( of V.H.N. about 720 ). The two alloys were :- (A). AC.7 chill cast, aged 18 hours at 165 to 175°C. Brinell hardness 48. (B). AC.7S (AC.7 with Silicon increased to 1.5%) aged 18 hours at 165 to 175°C. Brinell hardness 65. These two were first run on the friction tester one hour with Motorine 'C' oil, temperature controlled to 50°C in the sump, load 5 lbs. per. square inch. After this the oil was drained away and test continued for a total of 50 hours. Wear product with (A) was 0.105 gms. ( Steel or Iron 0.009 ). Wear product with (B) was 0.027 gms. ( Steel or Iron 0.003 ). .0059" thick Tests up to 20 lbs. confirmed the superiority of (B) over (A). A similar test done on a phosphor bronze some time ago showed a much greater wear than (B) in a quarter the time. Hl. H.L. 4 pieces 3/4" dia 28 sp.{Mr Spinney} gr.{George Ratcliffe} | ||