[Hallicrafters] Brass Cleaning Question-Tarn-X

[Ed]

Rich, I just went to the Tarn-X web site and the company says not to use it 
on brass.
----- Original Message ----- 
From: "Rich Oliver" <Rich.Oliver at lowell.edu>
To: <Hallicrafters at mailman.qth.net>
Cc: <Rich.Oliver at lowell.edu>
Sent: Wednesday, December 28, 2005 9:22 AM
Subject: Re: [Hallicrafters] Brass Cleaning Question


> Ed,
>
> I would suggest you start with a good ultrasonic cleaning.  That is often 
> sufficient.
>
> If we are talking about machine bolts rather than screws you can 
> accomplish a lot by "chasing" the threads.  Run the bolt into a die of the 
> same size and pitch.  Actually do that twice; run it all the way in from 
> the "start from this side" side, then reverse it and run the screw in from 
> the back side to get the threads closer to the head.  Be sure to clean the 
> crud out of the die when done.  Before chasing threads I like to soak the 
> bolt in WD-40, then another blast of WD-40 cleans the die quickly.
>
> If more attention is needed consider a quick dunk in Tarn-X.  That stuff 
> strips the surface layers pretty rapidly to reveal fresh metal.  It is 
> important to rinse the Tarn-X off quickly once fresh metal appears to stop 
> the stripping, particularly if the piece is only plated.  Most likely a 
> screw will be solid, though, so you should be OK.
>
> Tarn-X sounds pretty nasty and it is; but consider that Brasso and similar 
> products do the same thing by mechanical abrasion.  For a piece with deep 
> crevices like a screw you have to work at it to get the deep crevices 
> clean and that will abrade the high points in the process.
>
> Ed wrote:
>> I have discovered some screws that I think are brass. They are covered in 
>> an oxidation that looks just like sulfur. I am used to brass just getting 
>> darker with age. What is the best/least destructive way to clean Brass?
>> 73, Ed
>>
>>
>
>
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