bearing removal

[pegasus]

Hi
Anyone knows a way to remove the bearings from a bottom bracket with out the use of a press.

 

[undertoad]

Don't think you can remove them from one of those Shimano clone cartridge units, even WITH a press.
I believe they're crimped together, and are not meant to be serviceable.
You'd have to cut it open, to get at the innards.

 

[Popshot]

I clamped the spacer enough in a vice to compress it then resting the bearing on the vice jaws whilst hitting the end of the crank. They are just an interference fit and not overly tight either. I did this when playing with some idea or other I've forgotten now as I wouldn't bother getting them off just to change them given the price of a new full unit vs the bearing price, never mind squashing the spacer.

 

[stormbird]

What are you trying to do with it ?
The black bit is just a thin alloy spacer for the outer of the bearing race

Paul

 

[undertoad]

Hmmm - I learn something new every day!
I didn't think you could get them apart without destroying them.

 

[pegasus]

Thanks Popshot.

It is a scrap bottom bracket, bearings full of sand, I just wondered if you could attach a chain wheel in the middle of the shaft?

Can you weld the shaft? Only one way to find out.

 

[stormbird]

Thanks Popshot.

It is a scrap bottom bracket, bearings full of sand, I just wondered if you could attach a chain wheel in the middle of the shaft?

Can you weld the shaft? Only one way to find out.

You can't just post this picture and NOT tell us how you got it apart

It looks most useful now apart , I can see it being good for a pedalo style pedal assembly and making a narrow BB to lower the Q measurement ?

Paul

 

[pegasus]

I followed Popshot's instruction and yes, it's weldable.

 

[stormbird]

Excellent , now if we could replace the bearings with these :-

Then they would be great for doing a narrow BB or for the ends of this ?

Cut in half with the square end pointing inwards ?

Paul

 

[pegasus]

The bearings are 173310, 17mm id and 10mm wide, a pillow block bearing with 17mm hole is 22mm wide.

So the bearing stopper has to be removed.

I got this made a long time ago.

3mm steel plate with holes to fit a 19mm axle and a small or large chain wheel.

If I filled the gap between the bearing stoppers with weld and then machined down that part to 19mm, I could attach a chain wheel in the middle and run the chain thru or over/under the frame.

 

[stormbird]

The bearings are 173310, 17mm id and 10mm wide, a pillow block bearing with 17mm hole is 22mm wide.

So the bearing stopper has to be removed.

Does it ? it looks like the bearing would sit in the gap ? the pedal crank could also have a little meat removed from the inside ?
I have one somewhere with the spacer out of it , must try and find it.

Paul