Correction of Limiting Speed
When the bearing load P exceeds 8% of the basic load rating C, or when the axial load F a exceeds 20% of the radial load F r , the limiting speed must be corrected by multiplying the limiting speed found in the bearing tables by the correction factor shown in the figures (a) and (b).
When the required speed exceeds the limiting speed of the desired bearing; then the accuracy grade, internal clearance, cage type and material, lubrication, etc., must be carefully studied in order to select a bearing capable of the required speed. In such a case, forced-circulation oil lubrication, jet lubrication, oil mist lubrication, or oil-air lubrication must be used.
If all these conditions are considered, the maximum permissible speed may be corrected by multiplying the limiting speed found in the bearing tables by the correction factor shown in the table.
| Limiting Speed Correction Factors for High-speed Applications |
| Bearing Types |
Correction Factor |
| Cylindrical Roller Brgs.(single row) |
2 |
| Needle Roller Brgs.(except broad width) |
2 |
| Tapered Roller Brgs. |
2 |
| Spherical Roller Brgs. |
1.5 |
| Deep Groove Ball Brgs. |
2.5 |
| Angular Contact Ball Brgs.(except matched brgs) |
1.5 |
|
