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Bandsaw Thrust Bearing Question - how to remove?

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Forum topic by LucasinBC posted 06-25-2011 11:53 PM 5760 views 0 times favorited 6 replies Add to Favorites Watch
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LucasinBC

62 posts in 2536 days


06-25-2011 11:53 PM

Topic tags/keywords: question bandsaw bearing guide

Hi all,

Sorry for this post but I am really stuck here and I need help! I am trying to replace the thrust bearing on my bandsaw and I am having trouble taking the actual bearing off the post/rod assembly that it is on.

I have zero experience in working with machines / bearings, so this is not my forte. I have many replacement bearings of the exact same size, but now I am wondering if the shaft/rod thing is permanently attached to the bearing and the whole thing needs to be replaced.

There was a similar post here http://lumberjocks.com/topics/14528 but in that one the problem was solved by un-screwing the rod assembly…mine has no screws whatsoever.

I attached to two pics for clarification. My last resort is to take a dowell or something like that, put it in a vise, and bang the hell out of it with a mallet, but I fear that may break the entire assembly. Any hints?

Photobucket

Photobucket

Thanks!

-- Making mistakes is essential in learning woodworking.


6 replies so far

View Lee Barker's profile

Lee Barker

2170 posts in 2315 days


#1 posted 06-26-2011 01:21 AM

You’ll need two tools, Lucas: a puller and a refrigerator.

The puller, three jaw like this one, will come in handy from time to time. And you really need it now.

The little fingers grip the backside of the pulley and as you turn the fine-threaded shaft, the axle is slowly, and evenly, pushed out.

Clean up the axle part and put it in the freezer. You want to shrink that shaft down so it will slide right into the new bearing.

That’s all there is to it. You’ll have your bearing merit badge before the next tea at the Empress Hotel.

Kindly,

Lee

-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View mrg's profile

mrg

659 posts in 2464 days


#2 posted 06-26-2011 01:28 AM

Did it have a clip that you removed? If so push the bearing back down and use a little of sand paper to sand off any burs. Put a little WD40 or 3 in 1 on let it penetrate. You may have cocked the bearing. It will walk off. Push the shaft back down and if it still don’t want to move persuade it gently. Make sure before you put the new bearing on that the shaft is clean and smooth.

-- mrg

View TheOldTimer's profile

TheOldTimer

226 posts in 2551 days


#3 posted 06-26-2011 01:32 AM

Lee said it all, the only thing I can add, is if you do not want to purchase a puller you may be able to talk a brake shop into pull the baring off for you. I would purchase the puller. In fact, HF has a complete set of pullers at a reasonable price.

-- TheOldTimer,Chandler Arizona

View LucasinBC's profile

LucasinBC

62 posts in 2536 days


#4 posted 06-26-2011 01:39 AM

Hi all,

MRG – no there was no clip. I kept looking around for something that needed to be loosened, removed, screwed, etc…nothing.

Looks like I’ll be buying myself a puller to get the job done – I’ll let you all know if it worked. I hope so because I already have a bunch of replacement bearings lined up! Definitely beats having to buy a whole new unit.

Thanks for the tips everyone!
Luc

-- Making mistakes is essential in learning woodworking.

View philip marcou's profile

philip marcou

262 posts in 2062 days


#5 posted 06-26-2011 07:35 AM

Lucas, that one will be a press fit onto that eccentric shaft. Small bearings like that are easy to drive off with a suitable punch or mandrel. Simply stand it up in the jaws of a vise so the jaw edges contact the outer rim of the bearing and use a hammer to drive it out. Put a washer or similar bit of metal between the shaft end and the punch to protect the face.
To put the new bearing on you need to be sure not to damage it so you should support the underside of that flange either with a steel tube , or a socket or the vise jaws again but don’t tighten them on the shaft. Then the bearing is tapped on but you need to use a tube of some sort like a socket again that fits over the shaft and contacts the inner race ring of that bearing only-you shouldn’t apply any force to the outer ring of the bearing.
Again, for small bearings in that sort of application I just drift them on with a piece of brass of similar diameter to that inner ring.
Pullers etc are often essential but not in every case. A useful thing to know is that bearings that can’t be moved with pullers (for various reasons) are easily cut off with something like a small angle grinder or even a Dremel. Outer races /rings of standard ball bearings just fall off when you have punched or picked out the two rivetted spacer washers…..

View Spotcheck's profile

Spotcheck

8 posts in 1991 days


#6 posted 06-26-2011 04:32 PM

A drill press often works great as a bearing press. Get a socket, as Phillip suggests, put it on an extension bar, into the drill press chuck. Clamp/brace the shaft vertical on the table, and press the bearing onto it.

You can sometimes do it without the socket, by using the just jaws of the chuck – depends on the size of the jaws, the size + length of the shaft, etc.

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