Downtime bearing rotation frequency?

[mtech3700]

Business conditions have dictated that we will be required to shut down one of our production lines in the new future for up to 8 months and we want to be proactive in regard to our major equipment. We have several significant double row bearings in the 4-4.5" bore range (Dodge, Link Belt)that we feel will need to be rotated periodically to avoid bearing chatter/damage while we are down due to the vibration of other ongoing processes. What frequency should this ideally be done? Weekly, monthly, etc? Any thoughts or opinions would be greatly appreciated.

 

[Tmoose]

No detectable vibration, ever, in a temp controlled dry environment, I'd rotate components several rotations every few weeks

If there is slight but detectable vibration on the idle equipment I'd turn it every day.

With much detectable vibration at all it does not take long for balls or rollers to shiver and burrow down through grease and begin false brinnelling, which uses up most of a bearing's useful life and will (legitimately) set off all kinds of alarms for ball/roller pass frequency vibration on start-up if you are monitoring vibration (and you should).