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Four-Point Contact Ball Bearings Permissible speed
Permissible speed
The limiting speed listed in the (product table) s a mechanical limit that should not be exceeded unless the bearing design and the application are adapted for higher speeds.
Lily recommends oil lubrication for bearings with a ring centred cage (designation suffix MA or PHAS). When these bearings are grease lubricated, the ndm value is limited to 250 000 mm/min.
where
| dm | bearing mean diameter [mm] = 0,5 (d + D) |
| n | rotational speed [r/min] |