Michael A. Terrell Inscribed thus:


Baron wrote:

Michael A. Terrell Inscribed thus:


Baron wrote:

I've done that with a lolly stick and fine glass paper, then I
discovered the abrasive sticks made just for this purpose.


This was 30 years ago. No internet, and no industrial suppliers
in
town.


Similar time frame. Maybe 40... :-)
It was "Hoover" that provided the abrasive stick. The idea was to
use
them to quieten down particularly sparky motors. Even though they
had noise suppression capacitors and chokes on the motors they could
cause
TV picture break up. People did complain about it as well. I'd
being using the lolly stick for some time before then to smooth the
comm. I'm of the opinion that poor manufacture of some armature left
the comm slightly off centre causing the brushes to bounce and thus
arc more than they normally would.


A lot of those motors had the air flow over the commutator, and it
would get dirt or sand in it when people didn't put the bag in right,
or
would use it till the bag was full, and ripped. I wasn't working on
the vacuums, just the motors so the only parts I saw were new bushes &
bearings. A neighbor was in the used vacuum cleaner business and
would give me half a van load of bad motors at a time, then buy back
any that I fixed.


That sounds like a nice little earner. ;-)

--
Best Regards:
Baron.