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Measuring Clearance Reduction

The document describes a method for measuring the reduction in radial internal clearance of bearings before and after mounting using feeler gauges. The method involves rotating the bearing rings and inserting feeler gauges between the rollers and rings to determine the clearance. For large bearings, measurements should be taken at multiple positions and averaged to account for elastic deformation. Recommended clearance reduction values are provided in a table.

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Chia Peter
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124 views1 page

Measuring Clearance Reduction

The document describes a method for measuring the reduction in radial internal clearance of bearings before and after mounting using feeler gauges. The method involves rotating the bearing rings and inserting feeler gauges between the rollers and rings to determine the clearance. For large bearings, measurements should be taken at multiple positions and averaged to account for elastic deformation. Recommended clearance reduction values are provided in a table.

Uploaded by

Chia Peter
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Measuring clearance reduction

The method using feeler gauges for measuring the radial internal clearance before and after mounting bearings is applicable for medium and large-sized bearings. Before measuring, rotate the inner or outer ring a few times. Make sure that both bearing rings and the roller complement are centrically arranged with respect to each other. For the first measurement, a blade should be selected, that is slightly thinner than the minimum value for the clearance. During the measurement, the blade should be moved back and forth until it can be inserted to the middle of the roller. The procedure should be repeated, using slightly thicker blades each time, until a certain resistance is felt when moving between outer ring and uppermost roller (fig 1) - before mounting outer ring and lowest roller (fig 2) - after mounting.

fig 1

fig 2

For large bearings, especially those having a rather thin-walled outer ring, the measurements may be affected by the elastic deformation of the rings, caused by the weight of the bearing or the force to draw the feeler gauge blade through the gap between the raceway and an unloaded roller. To establish in such cases the true clearance before and after mounting, the following procedure should be followed (fig 3): Measure the clearance "c" at the 12 o'clock position for a standing bearing or at the 6 o'clock position for a bearing hanging on a journal. Measure clearance "a" at the 9 oclock position and "b" at the 3 o'clock position without the bearing being moved. Obtain the "true" radial internal clearance with relatively good accuracy from 0,5 (a+b+c).

fig 3

Recommended values for reduction of radial internal clearance are provided in table.

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