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Sealed Ball Bearing, or ?

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Forum topic by bubinga posted 04-30-2011 08:05 PM 2176 views 0 times favorited 7 replies Add to Favorites Watch
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bubinga

861 posts in 2135 days


04-30-2011 08:05 PM

Topic tags/keywords: question bandsaw ball bearing

What’s the difference between a sealed ball bearing, and a shielded ball bearing?
EDIT: Looking to replace band saw bearings

-- E J ------- Always Keep a Firm Grip on Your Tool


7 replies so far

View crank49's profile

crank49

3981 posts in 2438 days


#1 posted 04-30-2011 08:26 PM

A sealed bearing has rubber or other similar elastomeric seals that are fixed to the bearing and rub on the shaft.
A shielded bearing has metal labyrinth shields , like over-lapping washers, attached to the inner and outer races, but not actually touching each other.
The shielded bearing will have less friction, but is not as well protected from contamination.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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bubinga

861 posts in 2135 days


#2 posted 04-30-2011 08:41 PM

crank49

Thanks

-- E J ------- Always Keep a Firm Grip on Your Tool

View karlhead's profile

karlhead

6 posts in 2160 days


#3 posted 04-30-2011 08:48 PM

A sealed bearing is designed to seal against all contaminates especially liquids. whereas a shielded bearing is designed to prevent contamination from particulate matter.

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D_Allen

495 posts in 2251 days


#4 posted 04-30-2011 10:55 PM

Keep in mind that there are ‘cheap’ ones of both.
One main feature is the amount of lube they put into them.
Some I have seen seem to have had very little lube and go bad quickly.

-- Website is finally up and running....www.woodandwrite.com

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Minorhero

372 posts in 2072 days


#5 posted 05-01-2011 05:23 AM

I visit the old wood working machine forum (owwm.org) on a fairly regular basis. The folks on that forum are pretty much universally of the opinion that when replacing bearings on a machine it is always better to go with sealed bearings. I have done a handful of restores myself and followed this philosophy every time with only good things to say about sealed bearings.

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Grandpa

3256 posts in 2143 days


#6 posted 05-02-2011 01:45 AM

I agree that some bearings have more lubrication in them. I have seen this in a lot of areas especially in farm equipment. Ditto on the difference between the shileded and sealed bearings. I think I would go with the sealed if I could get them.

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swirt

2118 posts in 2439 days


#7 posted 05-02-2011 04:53 AM

THanks for asking this Bubinga… all good information I am taking in here.

-- Galootish log blog, http://www.timberframe-tools.com

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