Re: SER1 Horn Bracket

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We were taught to use Crocus paper on the communtator and the
tool used to machine it had to be ground a particular way to "cut"
the copper away not "chip" it...

On the weekend I ground the tool I used to an acute angle and it seemed
to cut just fine, I didn't have any crocus paper but used 400 grit paper
that
panel beaters use for rubbing paint...."the black stuff"...worked OK....

Bruce




> Graeme.
>
> Emery is what the French Resistance used to destroy machines during the
war.
> It is what is in, or used to be in, in Valve grinding paste.
>
> When you clean a commutator or other delicate equipment with emery paper
> some will come off and may get trapped in the machine. Later it may end up
> in bearings or other places.
>
> Sand from sand paper is not so hard and there is something different about
> the shape of the grains that I cannot remember. Consequently it is less
> likely to get embedded in soft surfaces (like copper commutator bars or
> brushes) or caught in bearings and so to cause problems.
>
> How significant the advice is I do not know but it is what was always
> taught. Perhaps it is just a counsel of perfection!
>
> I will try and find a reference or two but it will probably only be in old
> books. - The "Modern Motor Engineer" Suggests using 00 sandpaper for
bedding
> in brushes but would not be so crude as to use it on the commutator
itself.
>
> Regards,
>
> Nick.
>
> -----Original Message-----
> From: series1-host@xxxxxxxxx.xxx [mailto:series1-host@xxxxxxxxx.xxx] On
> Behalf Of Graeme Aldous
>
> Nick Condon wrote:
> <<you can use old flour paper (fine sandpaper) to give a final polish.
> (NOT emery paper - never emery on commutators).>>
>
> Nick, can you expand on that please?  Just this morning the latest
> edition of LRe has come through the post, and in it is the second part
> of my Home Workshop feature on overhauling a dynamo.  In the first
> paragraph I suggest cleaning the commutator with emery paper - I've
> ALWAYS done it, and I'm not aware of any problems.
>
> Convince me - I may have to get James Taylor to print an 'oops'!
>
> Regards,
>
>
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>


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