Replacing bearings in motor

[jbobb1]

thinking out loud, let me ask this: what difference is there between a 6205z and a 6205-2rs, besides the obvious difference in seals? are they for different applications? which is better for an electric motor?

No difference in bearings.
A shielded bearing is just that. It has a metal shield that covers the balls. Not contact.
A sealed bearing is basically a shielded bearing, where the shield is rubber coated and has contact with the inner race of the bearing, creating a seal.

 

[jbobb1]

I dont know


I dont know, the motor plate is totally unreadable. I know its 3 phase, it is on a Bridgeport clone step pully head

I would guess it's a 1750, but let me check my mill real quick.

 

[jbobb1]

My mill is 1750. It is variable speed, but I doubt that makes much difference.
You will be fine using sealed bearings.

 

[Investigator]

thank you

My mill is 1750. It is variable speed, but I doubt that makes much difference.
You will be fine using sealed bearings.

thank you very much

 

[jbobb1]

You're welcome.

 

[SLK001]

Remove the seals and repack the bearings with plenty of grease. They should just pop out (with a dental pick). I have been finding a lot of new bearings with hardly any grease in them, so I now routinely repack (or, more correctly, fill up) the bearings I use.

 

[Weldingrod1]

You don't actually want them completely full, unless there's a place for the grease to move out and around. Churning grease makes them hot, especially at 3600 rpm. I did that on my mill spindle and earned the opportunity to take it back apart again :-(

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