Subject: Shielded Bearings

From: [email-masked] (Greg Vrana)
Date: 27 Mar 1997 17:12:10 GMT

Is there a newsgroup that discusses electric motor repair?  I just
bought an old Walker-Turner sanding center from my uncle.  I took
apart the motor to clean it up and found that the shielded bearings
feel "dry".  Can shielded bearings be regreased?  If so, how and 
with what type of grease?  Or do they need to be replaced? 

-- 

Greg Vrana
[email-masked]

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From: [email-masked] (Robert Crable)
Date: 27 Mar 1997 20:26:31 GMT

In article <[email-masked]>, [email-masked] 
says...
>with what type of grease?  Or do they need to be replaced? 

Greg,
  Unless you're really hoping to pinch a penny, it's not worth trying to 
lube them, especially since you already have the motor apart.  Order new 
ones to fit.  Try Grainger  800-722-3291.  You'll find most of their 
bearings are $10 to $20 range, pretty cheap if you consider the cost of a 
new motor.  Just get the numbers off the bearings and let them cross 
reference them for you.  If you really are hoping to save some money, and 
a little time now, I usually put a few drops of 3 in 1 oil in the 
bearings.  They'll last a while, but if you feel any spots that "catch", 
pitch it and get a new one.
  Bob Crable
  Engineering Aide
  Research Instruments Electronics Shop
  Chemistry Department
  The Pennsylvania State University

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From: Matt Prusik <[email-masked]>
Date: Thu, 27 Mar 1997 19:51:16 -0500

I'd follow the recommendations here WRT replacement rather than relubrication of 
bearings.  Also, each time I order replacement bearings I specify SEALED rather than 
shielded bearings.  The seals keep dust and foreign matter away from the inside of the 
bearings which is the second most common reason for bearing failure -- lack of 
lubrication after mishandling during installation.
	Good luck!
	Matt

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From: Bill Pounds <[email-masked]>
Date: Thu, 27 Mar 1997 20:50:59 -0800

>   The Pennsylvania State University

I agree, but before you pitch them away, make sure you can get
replacements. I own a Walker Turner lathe, and the spindle bearings were
an OEM special item, and no longer available in less than 1000 units. I
have no idea if other W-T tools are like this.

If you do cross reference the bearings, ask for sealed instead of
shielded. They will hold grease and keep out dust permanently.

-- 
Bill Pounds
[email-masked]

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From: [email-masked] (Greg Vrana)
Date: 31 Mar 1997 15:06:00 GMT

In article <[email-masked]>, Bill Pounds <[email-masked]> writes:
> > <snip>

Well I bought new bearings this weekend and the motor now purrs like
a kitten.  The motor, BTW, was made by Clark Electric.  Next, I'm going
to replace the bearings in the belt rollers.  I hadn't thought that the
bearings might not be available though.  I'll be sure to check they are
first.  Thanks for the warning.

-- 

Greg Vrana
[email-masked]

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From: [email-masked] (Michael John Hide)
Date: Mon, 31 Mar 1997 18:12:34 GMT

Matt Prusik <[email-masked]> wrote:

;I'd follow the recommendations here WRT replacement rather than
relubrication of 
;bearings.  Also, each time I order replacement bearings I specify
SEALED rather than 
;shielded bearings.  The seals keep dust and foreign matter away from
the inside of the 
;bearings which is the second most common reason for bearing failure
-- lack of 
;lubrication after mishandling during installation.
;	Good luck!
;	Matt

I had allways heard that the grease/oil in ball or roller bearings
actually serves the purpose of preventing oxidation /rust .The reason
being that Ball /roller bearings have a very low running friction and
the so called Lubricant actually increases the torque to run the
bearing ,Of course the same is not true for plain bearings as they in
most cases run on a thin film of oil .
          mjh

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From: [email-masked] (#10 Ox)
Date: Tue, 01 Apr 1997 14:32:14 GMT

On Mon, 31 Mar 1997 18:12:34 GMT "[email-masked] (Michael John
Hide)" posted to "rec.woodworking" on the subject "Re: Shielded Bearings" :

All touching moving parts benefit from lubrication.  Roller bearings do
have more resistance to movement when lubricated than a brand new bearing
would have at first if used unlubed (dry)due to the tight physical
tolerance of its construction but:  running the bearing dry will quickly
wear it and those tolerances will not be tight for long!  Lubrication costs
less in terms of extra energy than the dollar cost of replacement bearings.
TS

-->I had allways heard that the grease/oil in ball or roller bearings
-->actually serves the purpose of preventing oxidation /rust .The reason
-->being that Ball /roller bearings have a very low running friction and
-->the so called Lubricant actually increases the torque to run the
-->bearing ,Of course the same is not true for plain bearings as they in
-->most cases run on a thin film of oil .
-->          mjh
-->

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