Block on Ring Machine: Ring O.D. is 40mm (1.57"). This test is normally performed at
800 RPM (329 FPM). For the BestLine test, it was performed at 1725 RPM (699FPM), which is
the maximum speed. There was no cooling pump being run for the BestLine test. The test oil
specimen flows at 50ml/min (.013209 GPM or 3.05127 Cu. In. / Min.). Standard Timken roller
bearings were used with outer race of ANSI 52100 steel. Mating blocks may be white metal,
bronze on steel C 0.9, MN 1.2, Cr 0.5, W 0.5, V 0.1 (2510 AFNOR 90 MCW5 Case Hardened.
To 58HRC). Load on different blocks: steel/steel = 1075 RPM, bronze/steel = 358 RPM, white
metal/Steel = 179 RPM.
The speed is first adjusted and then the load is steadily increased to the maximum
permitted within a period of 5 minutes. Each test was then run for ½ hour. Recordings were
made for maximum friction force and minimum friction force after run-in period. A stable curve
was recorded at the end of test and maximum temperature was also recorded. After completion of over 80 tests, SEM (Scanning Electron Microscope) studies, for
material reference and wear track studies showed the following:
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