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When fitting the bearing or sleeve, the expansion of the inner ring reduces the internal
radial clearance of the bearing. The reduction in clearance enables the tightness of the
fit to be determined. It is important to check this. Check carefully that the clearance
necessary for the correct functioning of the bearing is maintained.
Reduction of the internal
clearance after fitting
Measurement principle
The clearance is measured by sliding thickness
gauges between the outer ring and the rollers. With
large-size bearings, do not use gauges of thickness
exceeding 0.15mm, as they are too rigid to follow
the curve of the bearing raceway; use 2 or more
thinner gauges to make up the required thickness.
Measurement method
Place the bearing in the vertical position with the
rings parallel. Rotate the bearing to position the
rollers.
In table in page 30, identify the value of the gauges
corresponding to the considered bearing bore and
tolerance class (column 3).
Slide the feeler blade between the most unloaded
roller and the outer raceway (the upper part of the
bearing if it rests on a support, or the lower part of
the bearing if the outer ring is unrestrained or
suspended).
The tolerance value is between the two indicated
gauges (column 3).
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