[Vwdiesel] Brushes 101 . part 1---( the DIY way --el'cheapo )
h_hagar at prcn.org
Sat Mar 6 17:38:37 EST 2004
By some great luck a big corporation asked me if
I would like a course on carbon brushes.-----YES YES YES sir please.
So away I went , National Carbon ran the course. I was delighted.
Before I go in to the scientific details And YES I do mean SCIENTIFIC.
let me tell you where to get FREE brushes.Big corporations have special crews
with buckets of brushes hit the motors during shutdowns.They can not afford
to leave a brush of borderline service in . These are 24-7 operations and downtime
cost money. So buckets of perfectly good brushes go in the dumpster.
I raided such a dumpster , and if I live forever (as promised) I will never run
out of brushes.
Why ????? is a square block of carbon called a "BRUSH" ? will get to that later.
but hows about a "PIGTAIL" ? go ask a farmer.
With a handful of old brushes in hand what to do ? do like Val Christian suggested
a few threads ago. Since I do it a lot I have a kit handy for doing brushes.
A small hacksaw a handful of short length's of square keystock.
Lay brush between two pieces of keystock and drag a flat bastard across.
And bingo a new brush for your blower motor .
Select the closest grade you can find --- by feel and by rubbing on piece of paper.
Brushes come in a number of grades and composition. Starter (High amp) alternator (low amp) etc.
High amps are usually high copper content. Low amps are high on graphite.
Even silver graphite is available. ( I am a silver freak ).
Selecting a pigtail is more of a problem. How are pigtails connected to brushes ?
The most important to us is by "Amalgam" yes copper amalgam. So if your sisters
boyfriend is a dentist use silver amalgam.
Some brushes use big rivets --- if you can get them for free take them , as stock carbon
they are fine. When you do bosch VW starters do not cut pigtail at plate ,cut at brush
then you can use a stake- on connector to splice pig to new brush.
I am doing one right now brushes are marked E 41. Silver soldering is my normal
way of connecting pigtails.But in a pinch stake-on works fine.
Until next time remember this is a DYI emergency fix ---- I advice you to use
genuine replacement if at all possible.
A good source of free high copper brush stock ? Cranes use a lot on trolley wires.
Great for starters. BIG truck starters old brushes. it is all around us ---- all you got
to do is look and ask.
So what got me started ? --stealership pricing. In 1972 I ordered brushes
for a Deco Remy alternator from Auto Marine Electric and knowing that brushes
for a motorola of equal power was 4.95 complete with holder. I ordered two.
One day some time later they phoned me -- your brushes are in.
When I got there the counter man said you better sit down --- 45.85 each.
So I payed for one and told them to stuff the other.
PS: Medium garnet paper works good on brushes. Is this overkill for a Rabbit ? yes
but I wrote it for a reason. Vacuum cleaners ,hand drills. skill saws gensets ok
you got it. Brushes are used all over the place.
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