[ARC5] BC-348 DYNAMOTOR

[J Forster]

I suggested a piece of soft tubing for padding and gas pipe pliers, not knowing
what tools the original poster had available. IMO, a screwdriver in the slot
could well break the caps.

Best,
-John



Mike Hanz wrote:

> Ah! Good point...if the brush caps are stuck, then a non-burring method
> of removal is needed.  A collet is the best method, but failing that,
> you can back down the list of cylindrical workpiece holders - a six jaw
> chuck, then a four jaw chuck, then a three jaw (common with most
> electric drills.)  By the time you get to a three jaw chuck or a pair of
> pliers with a roughly round shape in the jaws, you'll need some serious
> padding to keep from scratching the knurled pattern on the brush caps.
> Cardboard is useful in this situation.  Let us know how it turns out, John!
>
>  - Mike
>
> J Forster wrote:
>
> >Apparently the caps are stuck.
> >
> >You make a good point though. The brushes could well be stuck w/in the
> >holders and pushing them a bit w/ an orange stick or equal may free them.
> >
> >Mike Hanz wrote:
> >
> >>They are most likely simply stuck because of corrosion between the
> >>carbon brush and brass sleeve, John.  It's a common condition.  If you
> >>can reach the brushes where they contact the armature, just push them
> >>gently in in both the x and y axis with a wood dowel or other soft
> >>material while pulling gently on the wire out of the back of the brush.
> >>They usually pop loose with some gentle nudging.  Just try not to gouge
> >>the soft copper of the commutator in your efforts.
> >>
> >>WB9NWN wrote:
> >>
> >>> AM TRYING TO CHANGE THE BRUSHES IN MY DM-28
> >>>DYNAMOTOR. I CANNOT REMOVE THE OLD BRUSHES! ANY HELP FROM ANYONE?
> >>>