Measuring the axial reduction
Where tilting clearance measurements are not possible we recommend the axial reduction measurement method. In this case the center of the load combinations lies within the race diameter of the bearing. The loading principle is shown in figure 3:
Figure 3: Loading principle of the axial reduction measurement
The measurements are taken between the lower companion structure and the bearing ring which is bolted to the superstructure (figures 4, 5).
Figure 4: Basic setup for measuring the axial reduction with a depth gauge
Figure 5: Basic setup for measuring the axial reduction with a feeler gauge
The procedure is similar to that for measuring the tilting clearance:
- Here too, record reference values when the equipment is put into operation.
- Mark the measuring points around the circumference starting from a defined position.
Repeat the tilting clearance or axial reduction measurements under the same conditions at appropriate intervals, after first checking the bearing fastening bolts. The difference between the current measurement and the reference measurement is the wear which has occurred in the intervening period. If the wear values show a rising trend, you should carry out the measurements more often.
Advantage: Given conclusive assessment of the bearing's condition, worn parts can be replaced in good time. In conjunction with optimum spare parts management, it is thus possible to avoid incidents of damage and lengthy downtimes.
Note: If the permissible wear values are exceeded, we recommend that the equipment should be shut down.