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K94500
ROF Grease Tester
The ROF Grease Testing Machine determines both the useful life and high
temperature performance limits for a lubricating grease in a small, lightly-
loaded deep-groove ball bearing test. The test sample is run at different
temperatures and speed, and then results can be used directly for calculation
of the grease life in actual lubricated-for-life DGBB applications such as in
electric motors. To conduct a test, the standard 6204/C3 test bearings with
separate shields are prepared and lubricated with a standard quantity of the
test grease. Two bearings are properly mounted in each test station for up to
five (5) stations and then slowly brought up to the test temperature. Each
bearing set is individually temperature-controlled by means of a
thermocouple. When the test temperature deviates by 20°C from the preset test
temperature as a result of bearing failure, the particular station involved
will be switched off automatically. The other stations will continue running,
and a counter monitors the total number of hours each station has run. From
the number of running hours, the median grease life (L50, the time at which
50% of the bearings fail due to inadequate lubrication), grease life (L10,
the time at which 10% of the bearings fail), and the Weibull Exponent ß (the
measure of the spread in grease life) using the Weibull Software Package.
From the results obtained, a calculation can be made how bearings will behave
in practice as well as a relubrication interval. The test bearings 6204/C3
are normal production bearings and are the only component that has to be
renewed for each test, keeping the overall cost at a minimum.
Specifications
Bearing Type: 6204-2Z/C3, normal filling degree
Standard Shaft Speed: 10,000 rpm
Optional Shaft Speeds: 6,000 and 20,000 rpm
Test Temperature: ambient to 170 °C
Radial Load: 50N / bearing
Axial Load: 100N / bearing
Dimensions lxwxh,in.(cm)
Control Unit: 25.5x17.75x36.5 (65x45x93)
Bearing Testing: 69x35.5x10.5 (175x90x27)
Net Weight: 759 lbs (345kg)
Shipping Information
Shipping Weight: 935 lbs (425 kg)
Dimensions: 35 Cu. ft.
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