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Reducing Tube OD
phelpsa - 25/10/12 at 08:54 AM

Sorting a better steering column with removable wheel over the winter. I have my 3/4" bearings and 3/4" tube, but for obvious tolerance reasons one does not fit inside the other. I had hoped that a simple massage with some emery would be enough to sort it but it would appear not without a few days work!

Anyone have any better ideas without a lathe? I have in the region of 0,10mm of material to remove on diameter.

[Edited on 25-10-12 by phelpsa]


flibble - 25/10/12 at 09:26 AM

I'd probably go at it with a fine flap disk, depends if you mind a bit of a bodge! (I don't )


ashg - 25/10/12 at 09:34 AM

Why bodge it? I can turn it down for you if you want to send it to me. Or I'm sure another more local lcb with a lathe will offer to do it for you for a beer.


loggyboy - 25/10/12 at 09:47 AM

only 0.1mm needed?
Use course sand/oxide paper to loose most of the material, then grade doen through various papers till its smooth.
Are you trying to reduced the shaft outer dia or increase the bearing inside dia?


designer - 25/10/12 at 09:52 AM

quote:

I have my 3/4" bearings and 3/4" tube



Are you sure? A simple rub with wet and dry would soon make it fit.

Are you doing it right?

Second column five from bottom: http://www.shedworks.eu/hints.html


phelpsa - 25/10/12 at 10:23 AM

It's probably down to the quality of paper I'm using in that case. Will give it another go with some better stuff.


Jasongray5 - 25/10/12 at 10:24 AM

Some percussive persuasion will do it!
Agricultural bearings are like this, you usually have to cut them off, and press/hammer them onto shafts.
Jason


TimC - 25/10/12 at 12:25 PM

Freeze the inner and heat the outer?


Bizarro - 25/10/12 at 01:59 PM

+1

Put the bearing in the oven at about 100 for around 10 minutes, it'll slide on easy.


phelpsa - 25/10/12 at 04:37 PM

Due to the bearing location, interference fit isn't really an option (I had thought about it previously). I've got a plan to bring the tube back to uni to use a lathe and some w&d now. Thanks for the input guys.