[Antennas] Glass Cleaners

Tue, 30 Apr 2002 15:07:39 -0500

I----- Original Message -----
From: "Joe Giacobello, K2XX" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Friday, April 26, 2002 7:56 AM
Subject: Re: [Antennas] Glass Cleaners

> Just out of curiosity, Rich, isn't Bon Ami too abrasive for optical glass?
>
I would have thought so, too, Joe, but I sure haven't got the experience
Rich has, I guess.  Bon Ami has finely ground feldspar in it, at least, it
did last I knew.  Back in the 50's and 60's when most Mack Truck diesels
weren't turbocharged, we called it "Overhaul In A Can". We'd occasionally
get an new truck with an engine whose rings wouldn't seat within a
reasonable "break-in" period and it would be a oil-burner.  Our
quick-and-dirty fix was to run the unit with the intake manifold off (good
old naturally aspirated diesels!) long enough to let the vacuum suck a
tablespoon of Bon Ami down each port.  We'd run it at about 1800 rpm for
about 20 minutes, change the oil, run it another 20 minutes, then change the
oil one more time and turn her loose.  The feldspar was abrasive enough to
knock the glaze off the cylinder walls and lap the rings.  Success rate was
about 100% as I recall, and it never caused us any durability problems.
Until...

Made the mistake of telling a customer about it.  He couldn't  find any Bon
Ami, so he decided to use Comet instead--then he drove the old (actuall new)
B-model Mack about 120 miles without changing the oil.  It sure stopped his
oil consumption!  I think it cost us about $1500 to pay for his overhaul!

Anyway, in my ignorance I would have sure been careful about using Bon Ami
on glass.  Maybe "Old Dutch Cleanser" ...remember "hasn't scratched yet"?

73,
Tom

----- Original Message -----
From: "Joe Giacobello, K2XX" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Friday, April 26, 2002 7:56 AM
Subject: Re: [Antennas] Glass Cleaners

> Just out of curiosity, Rich, isn't Bon Ami too abrasive for optical glass?
>
> 73, Joe
>
> [email protected] wrote:
>
> > I do know that vinegar contains some solids and acetone can leave a film
on
> > the glass.  With over 20 years knowledge of cleaning optics for thin
film
> > coating, Bon Ami with a final alcohol (the purer the better) wipe is
about as
> > good as it gets.
> >
> > Rich, KF6SZA
> >
> > In a message dated 4/25/02 3:37:52 PM Pacific Daylight Time,
> > [email protected] writes:
> >
> > <<what about using acetone or vinegar? -W2WU>>
> > - - -
> >
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>
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