The wrapped or thin
wall bushes are not accurately mensurable in the unfitted condition.
Here we list the standard measurement method. Testing the outside diameter The outside diameter of CSB wrapped plain bearings that
have to have the interference fit (press fit) in the housing
are tested with the aid of a special device.
In this test the outside
diameter is measured under prestressing force according to DIN
1494, part 2, test A to determine the deviation Delta Z from
a standard value. Test load and permissible deviation are calculated
according to DIN 1494.
Normally this method is suitable for large series.
The simplified method for testing the outside diameter of plain
bearings is based on DIN 1494 Method B. The test uses GO and
NO GO ring gauge. The corresponding diameters of the GO and
NO GO ring gauges are selected according to the DIN standard.
Normally this method is suitable for smaller series.
Testing the inside diameter The inside diameter is tested according to DIN1494, part
2, test C. To perform this test, the bushes should be fixed
in a ring gauge (table 5 according to DIN1494 part 1) in this
condition the inside diameter can be tested with GO or NO GO
plug gauges.
Normally this method is suitable for smaller series. The big
size bushes recommend use of a three-point micrometer is preferable.
Testing the thrust washer Beside the thickness, the flatness of a washer is of particular
importance as it has impact on the life of both the washer and
its mate.
We use very helpful test in which the washer falls through the
gap between two plain parallel plates of a gauge under its dead
weight. The plates must be big enough to cover the whole washer.
