[ARC5] Bearings for DM-28 dynamotors

[WA5CAB--- via ARC5]

It is generally not possible to remove the bearings from any US built WW-II 
or Korean War vintage military dynamotor without destroying the bearings.  
So never remove bearings just for cleaning.  The reason is that the inner 
race should be a press fit on the shaft.  You should never pull a ball bearing 
pressed onto a shaft by pulling on the outer race because you will damage 
the balls and the races by something called "Brinelling".  Because of the way 
that all of the armatures are made, you cannot get a puller on the inner 
race, which is the only part that it is safe to pull or push on.  Whether you 
use a crudely modified battery terminal puller or a proper 3-jaw puller or a 
pair of vise grips and a 5 pound hammer, you are going to destroy the 
bearing if you pull it.  So don't remove it unless you have a new replacement on 
hand.

If the bearings are shielded or shielded and sealed and you have no new 
replacements, the only reasonable procedure is to remove and discard the 
shields (which will also discard the seals) in place. and clean and lubricate the 
bearings and hope for the best.

In a message dated 11/25/2014 16:44:57 PM 
> On 11/25/2014 4:30 PM, Clare Owens wrote:
> >Now I'll learn how to remove them or rather how hard it is to remove them
> >without too much collateral damage :-)  Reading about it is one thing,
> >doing it another.  I really do (usually) enjoy trying new things...
> 

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480