Meat Plow wrote in message
...
On Sun, 4 Oct 2009 14:44:20 +0100, "N_Cook" wrote:

Needs new brushes as one had cracked along half the length but not broke
away, so forming a wedge in the slideway. Along with some conglomeration
of
carbon etc in that part of the slideway and beyond into the gap and
presumably into the crack , until it jammed out of contact. Anything to
be
aware of for the brush composition ? otherwise looks like a mains voltage
carbon/graphite brush. No name motor for spares. How to clean off the
build
up of carbon on the commutator and is there an equivalent , for low V
high
A motors, of bedding in with bedding stone ? as no aperature available to
poke any stone in there when assembled.


Clean the com with extra fine emery and stone with rotor in a lathe or
other apparatus. This is a scooter motor correct?

Actualy on a golf cart. A bugger to get at as one retaining bolt was seized,
steel bolt into tapped aluminium. Al had corroded rather than the steel on
our wet links. Is there a recognised way of chemically dissolving the
aluminium oxide for the next time of doing this. Luckily I could hack into
reinforced heavy duty structural plastic to release the mount , then undo
the bolt with molegrips, Impact driver after penetrating oil would not shift
it, only deforming the bolt head. Would grinding/drilling a well under the
head of such a bolt and a few drops of battery acid in there do anything. ?