Heeeeeelp!

[Phil Dart]

I've had better days. The front bearing on my lathe is completely buggered. Managed to source a new one from Myford - managed to dis-assemble the head to get at it, but I just CANNOT get the old bearing off the spindle. Are any of you engineers able to give me some tips?

 

[Bigblackdog]

have you got/used a set of pullers, phil?

if you dont have any, and need it sorting urgently, I would take it to a local backstreet garage- they will probably have it off the shaft in seconds!

 

[Themackay]

Try putting it in the freezer Phil

 

[silver]

Either a three legged puller or a hydraulic press to push it out.

Depends on if it's a taper or ball race.

Can't see on pic just Very well how it's fitted but would guess it's an interference fit. If it won't pull or press off youmay need warming up a little to get it off.


The more important thing is to get the new one fitted without damaging it.

 

[Phil Dart]

Thank you gents. Pullers are a new concept to me, but the local garage is a good tip, as is heat and cold - thanks very much. Yes, it's a parallel shaft so therefore presumably an interference fit - certainly no grub screws or anything else present either on the old or the new bearings. Heat is the cause of the problem I think, so may well be the solution too. Some ideas to work on in the morning.

 

[Terry]

Any small engineering firm will get it off in seconds and refit the new one for you Phil. It is a simple job. !!!

 

[PetrolP]

After our recent conversation about new lathes and the need for a second one!!!!!!
Who would have thought this would happen?
What bad luck
Hope it works out well and quickly

Peter

 

[Penpal]

Most important Phil is to ensure that the bearing is replaced only using pressure on the centre ring of the new bearing on the outside is goodnight Irene to bearing health, wrecks the cage.

Peter.

 

[Phil Dart]

Thank you Terry. Local engineering firms are a bit less local than you might think in the Highlands, but I'm grateful to you and I'll get on the case first thing in the morning.

Yes, it's ironic Peter. It's made me realise though that even if repair is a complete and speedy process, I do need that Jet and quickly. I can't be without a lathe, and today has shown me just how lucky I've been all these years with out a backup.

 

[Phil Dart]

Thanks Peter - I'm no engineer (can you tell?) and I'll definitely bear your advice in mind when refitting

 

[Penpal]

You can never have too many lathes Phil but isolation is a bummer. A hydrolic press can be your good friend.

Peter.

 

[Dalboy]

Looking at the photo at this angle it looks like it is a tapered bearing and there is a thread at the far end. It also looks like the inner race of the bearing will need to be taken right along the shaft to the far end. First thing to do is remove any rubber parts of the bearing, if that is a thread on the far end screw the nut back on so that the shaft end in flush with the bottom of it this will protect the thread while working on the removal.

Now get a small flamed blow torch and heat the inner race only and avoid the shaft, the shaft will get warm through heat transfer but not enough to worry about.

Get someone to help with the next bit with some type of protection on their hands as the shaft will be hot to handle get them to hold the shaft with the far end resting on a solid bit of wood(this is why you put the nut back on) while you using a drift give the inner race sharp taps all around the perimeter this help to keep the inner race level as you tap it down.

Hope that makes sense. It is easier to do than explain in word on the computer well for me it is.

If you have any tool hire shops near you they may have a press if all else fails.

This is my way of doing this but that is from 25 years working with site machines from Electric drills up to large site diggers and dumpers

 

[wm460]

Phil it is easy enough to make your own pullers, got a couple of sets some where in the shed.

home made bearing pullers - Google Search

 

[Themackay]

Axminster have discount on Jet just now Phil

 

[Doug]

Just cut the old bearing off, then put the spindle in the freezer over night & keep the new bearing warm & in the morning it shouldn't take much force to push the new bearing on.

 

[Phil Dart]

More good advice from one and all - thank you gents. It's spent the night in the freezer on the basis that it may do the trick but if not I won't have done any harm either. So it that alone is not enough I'll be working through all your suggestions this morning.

 

[Phil Dart]

OK, so this morning is operation "get the bearing off my lathe spindle". Thanks for all your advice yesterday guys. If I understand it right, it's spent the night in the freezer on the basis that it might do some good, but if not it won't have done any harm either.

Now I've got to tap it with a hammer.



If that fails I've got to torch it,



then try a puller



and as a last resort just cut it up.



Have i missed anything?

 

[Penpal]

The one in black is a keeper.

Peter.

 

[wm460]

I reckon the one in the black will cause more trouble than your bearing.

 

[pittswood]

Here Here!
Bloody nice though.