Determination of boundary lubrication, load bearing capacity, pressure distribution, friction and Sommerfeld Number. A unit consists a motor driven journal shaft, mounted in supporting bearings over which test bearing floats. Oil supplied to bearing by gravity speed from oil tank. Motor provided with speed control. Pressure gauge connected to a tapping over the bearing. Tapping can be rotated to required angular position around the journal axis, pressure distribution around the bearing can be noted. A torque arm and weights provided enable to measure the friction torque. Due to rotating pressure gauge, high pressure can measured avoiding overflow and air bubble problem of conventional oil manometer type unit, an accurate determination of graph of coefficient of friction Vs Sommer feld number is possible , which is useful to decide to whether the bearing is bearing is operating in boundary lubrication or oil film lubrication. Vary small radial clearance of 0.1 mm enables to use the theory without doubt, because at large clearance, theory cannot be accurately applied.
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