(ET) Bearing job, magnet reglue, I hate hubs

[Chris Zach <cz alembic crystel com>]

Ok, so I went out and spent $50 bucks at harbor freight for a bearing 
puller. Nice enough set, use the big puller for these bearings and not 
the small one.

First I practiced on an old motor shaft. Rear bearing is simple to 
remove, tapping on the new one with a socket just a bit smaller than the 
inside race got it on with no problems.

I could not remove the blade hub from the bottom: Putting bolts in the 
hole all the way simply results in the bolts collapsing with the puller. 
Heat didn't help, so I gave up for now. Maybe I need a tungsten rod or 
something like that but the forces here are simply insane.

Next up was the real motor shaft. Back bearing came off pretty easily 
but the front one was another matter. First the bearing exploded: It 
broke apart and the outer race cracked. So much for that. Getting the 
inner ring off took heat, pressure, and whacking away at the puller with 
a hammer but finally it started to move and came off. I cleaned up the 
shaft, used the old inner race as my spacer with some 3/4 washers and a 
21mm socket to tap on the new bearing (once again only pressure was on 
the inner race) and I think I drove it on a tiny bit too far. Will see 
what that does to the motor alignment.

Next job was to fix the magnet. Before I started gluing I noticed that 
it was impossible to really hold the magnet in place because it pushed 
away from the other magnet in line with it, and it always wanted to 
smack into the magnet on the other side. So after a moment of though I 
got some 1/2 playwood, and started making jigs.

First I cut a strip a bit wider than the normal separation amount of the 
magnets. Then I used the grinder to make a perfect snug fit so the wood 
would just go down the side. Then I did the other side, now I have a set 
of guides for the new magnet.

But even that is not enough as the magnet pushes away from its neighbor. 
So I made a second spacer that went across the inside diameter of the 
motor magnets. Just barely fits. Now I'm ready: I cured up some JB weld, 
covered a good bit of the magnet face and the inside metal face, put in 
my two side jigs, put in the magnet (I marked it, also it's easy to see 
the side that butted the other magnet as it's pretty clean), then drove 
in the center spacer, made sure everything was as aligned as I could, 
and am leaving it for a couple of hours to cure.

Hopefully this works. If so I'll assemble it and give it a try on a 
small 12 supply. Should spin right up.

Next I am going to need some sort of end seal, as I didn't see one on 
this motor, and something's got to keep junk from getting in there. I am 
using sealed bearings this time as opposed to the stock open ones with 
metal shields, we'll see what happens.

Any other ideas on getting these hubs off, or should I just cut them 
lengthwise with my cutting wheel?