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Replacing the bearing of your cabinet saw motor...

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Forum topic by Milo posted 05-27-2009 05:53 PM 1327 views 0 times favorited 8 replies Add to Favorites Watch
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Milo

869 posts in 2784 days


05-27-2009 05:53 PM

Topic tags/keywords: question tablesaw refurbishing

Have any of you ever replaced the bearing on your cabinet saw motors?

Where on the scale of 1 – 10 does this procedure fall?

Is it something you’d actually WANT to do, or better to have someone more knowledgeable handle?

fwi, I’m asking after a 5 hp delta rockwell unisaw.

Thanks,

Milo

-- Beer, Beer, Thank God for Beer. It's my way of keeping my mind fresh and clear...


8 replies so far

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GaryK

10262 posts in 3454 days


#1 posted 05-27-2009 06:04 PM

How old is your saw? Also why do you think that you need to replace them?

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

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marcb

768 posts in 3139 days


#2 posted 05-27-2009 06:13 PM

Single phase or 3 phase, RI or regular Induction?

3 phase motors are easy as pie to work on, single phase cap start and RI motors are a little more complex and you need to take some care when working on them as to not damage some of the parts.

Not horrible either I just helped someone tear one apart last night in BAD shape and it probably only took us 20 minutes. That included a lot of coaxing with a brass hammer, punches and what not.

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Milo

869 posts in 2784 days


#3 posted 05-27-2009 07:15 PM

Sorry guys..

1971 Delta Rockwell 3 phase 5 HP motor. Not sure about the RA vs. regular Induction. Please educate me to the difference so I can be a bit smart than I am right now. :-)

Overall I think the saw is in good shape. The motor looks rather “clean”, but my gut tells me it is running rough for some reason.

Thanks again!

Milo

-- Beer, Beer, Thank God for Beer. It's my way of keeping my mind fresh and clear...

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marcb

768 posts in 3139 days


#4 posted 05-27-2009 07:46 PM

If bearings haven’t been done on it they’re probably already well on their way to going bad, best to get them replaced.

RI stands for Repulsion/Induction Its more complex to make but many people feel it is a far supperior motor. No one makes them any more because an el cheepo import would probably run $800 or more due to the complexity. I don’t think they where using them still in the 70’s so that simplify things.

There are basically 6 parts to a 3 phase motor (from a minor disassemble pov) 2 of them are end caps and 2 of them are bearings. The other two are the center portion which contains the stator (stationary part) and the shaft portion which is the rotor (or rotating part)

Unbolt the motor ( Many people mark the end cap to center position on them to make reassembly easier.) should be 4 long bolts or threaded rod with nuts on either side. Persuade one of the end caps off and pull the rotor out.

Should look something like this.

In that picture the 2nd bearing is in the end bell still, tap of the shaft with a little brass hammer to get it out.

From there you pull the bearings off and then press them on. If you don’t have a press many people use a punch on the inner ring to slowly drive it on. If you do this be GENTAL and go slow as you can make small divots in the inner race which lowers the life of the bearing.

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Milo

869 posts in 2784 days


#5 posted 05-27-2009 09:40 PM

Unfortunatly, you picture is not showing up. I found this website,

http://www.sawcenter.com/unisaw.htm

Any opinion on it’s explination on how to remove the bearing and arbor?

Thanks!

Milo

-- Beer, Beer, Thank God for Beer. It's my way of keeping my mind fresh and clear...

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marcb

768 posts in 3139 days


#6 posted 05-27-2009 10:11 PM

Click here for a big picture

http://upload.wikimedia.org/wikipedia/commons/5/58/Stator_and_rotor_by_Zureks.JPG

As for the arbor part that looks like how I did it. As for the bearing removal I usually use a 2 or 3 jaw puller as I don’t have a big enough arbor press for removal like that.

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Milo

869 posts in 2784 days


#7 posted 05-28-2009 09:17 PM

I was thinking of just taking the arbor bracket off and sending it off to have the once over done on it. I’ve no idea if anything has ever been done to that arbor or not.

Do I need to worry about brushes?

Thanks!!!

-- Beer, Beer, Thank God for Beer. It's my way of keeping my mind fresh and clear...

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marcb

768 posts in 3139 days


#8 posted 05-28-2009 10:48 PM

Brushes are only on DC Universal and RI motors. So you’re safe.

Not sure what you want the arbor bracked looked over for, besides bearings the I would think the only issue could be a bend in the arbor or a TON of wear on the metal to metal contact parts Both you would notice I would think.

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