Ralph,
,
You should remove the motor endcap
nearest the brushed, then install the brushes as they were and see
what is going on with them.?
Things will be a little bit loose, but
you should see why the one brush is wearing unevenly.?
Try each brush in each hole, and even
turn the brushes 180 degrees, (like a drill, not a pizza) and see
if they fit better or worse in 1 attitude or the other.
Turn the main armature and see if the
brushed become dislodged, they should remain perfectly
perpendicular as you spin the armature.
Continue disassembly and clean all of
the carbon dust out of the interior and reassemble with? a drop of
oil on the bearings.
If the bearings have even the smallest
amount ow wear, the motor can fail to run.
The shaft can become out of center with
the magnetic field and lock up while power is applied and then
turn smooth again without power.
.
Good Luck
On 7/1/2024 5:23 PM, Tony Smith wrote:
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You really need to check if
that holder is bent or loose.? That
commutator shouldn’t be the that black.? Or any sort of
black really, it needs cleaning.
?
Doing
both isn’t too hard.? You need to pull the end cap off, just
take those 4 bolts out.? The cap will be on tight, you might
need to tap it off with a hammer.? Once you get that off the
armature should come out.? Would help if you take the pulley
off.? The bearing in the end cap often hinders things, just
slowly work at it.
?
Before
you do that put some marks on the case so you know how to
put it back together.
?
Just
check the brush holders for anything “odd”.? Loose, cracked,
bent, etc.? That brush shouldn’t be angled, and neither
should the holder.
?
Cleaning
the commutator is basically using fine sandpaper(600 grit or
better) ?to get back to the copper.? Use a solvent and brush
to get as much of the crud off as you can.? Put the armature
into the lathe, wrap a strip of sandpaper around the
commutator (like you’re not supposed to do) and spin it.?
Powering up the lathe would make it easier, but y’know.? If
you’ve got a drill stick it in there.
?
Go
easy, the copper is hardened, but it’s copper.? It won’t
take long.
?
It’s
possible the commutator is worn, but unlikely.? The fix is
you just simply turn it down in the lathe, but again. yeah
k’know.
?
Once?
that’s done find something to clean out the slots in the
commutator, a hard plastic tool or the like.? Don’t use a
knife etc.? There are mica insulators down in the slots,
again be gentle and don’t damage those.? You want to get all
the carbon & copper dust out.
?
Wipe
it down with the solvent, put it back together and see how
it runs.?
?
Tony
?
?
?
Here is a video viewing the commutator
and brush holder.
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