[ARC5] Dynamotor Maintenance

[J. Forster]

Brushes are largely graphite:

http://en.wikipedia.org/wiki/Brush_(electric)

It is the only form of carbon that has lowish electrical resistivity
(except possibly for Bucky Tubes).

-John

===================

>
> On Jan 19, 2013, at 11:15 PM, J. Forster wrote:
>
>> I am puzzled by your statement that Graphite is abrasive, especially
>> since
>> it is widely used as a dry lubricant.
>>
>> Messy, for sure, but abrasive?
>
> John,
>
> Carbon is found in many forms, from diamond to walking human beings
> and ancient trees.  I think he means the stuff that is found as dust
> after the brushes in the dynamotor wear down a bit.  I would expect
> that under a microscope the black dust would appear as irregular,
> hard, granules that be quite abrasive, whereas graphite as used in
> lubricants would be flat, thin, wafer-like particles that would be
> quite slippery.  Some clay is like that.
>
> Roy
>
> Roy Morgan
> k1lky at earthlink.net
> K1LKY Since 1958 - Keep 'em Glowing!
>
>
>
>