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Re: [Amps] Ham sells fine grit thing to clean contacts

To: Charles H <>,
Subject: Re: [Amps] Ham sells fine grit thing to clean contacts
From: George <>
Date: Mon, 17 Aug 2015 07:33:00 -0500
List-post: <">>
Charly and the group,
Using files/sandpaper/emery cloth/etc for contact cleaning is a bad idea for reasons already cited. Alcohol with paper/business cards works for light cleaning. If more vigorous cleaning is required I would suggest getting a contact burnisher. These are available from electronic supply houses and eBay.
73, George

On 8/17/2015 12:10 AM, Charles H wrote:
it will be a few weeks until I get whatever this man sells, but it is very 
unlikely sandpaper coated with silica only.
"EmEry" Emery on paper for fine grinding is mostly aluminum oxide for whatever 
good or ill that means.
A file makes me nervous due to the temptation to push too hard.

I have used white typing paper which works on very little oxidation/corrosion 
but can be seen as a dark smear on the white paper which tells you are getting 
something off the contacts.  Fully black silver contacts usually will not come 
clean enuf with just paper.

I have not tried spray-on contact cleaners, sold by that naming, nor carbon 
tetrachloride (yes I can buy that).   I have used commercial silver polish, for 
tableware and granny's candelabra, on silver coax sockets and that works good 
on medium tarnish but needs lots of rubbing and the really black tarnish 
resists that polish about half good.

I am open to good suggestions.  Charly

Date: Sun, 16 Aug 2015 18:28:02 -0700
Subject: Re: [Amps] Ham sells fine grit thing to clean contacts

Someone told me once that strips of paper from a brown paper bag works
good for cleaning relay contacts.  73

On 8/16/2015 6:13 PM, Jim Hargrave wrote:
Sandpaper is a no no on relay contacts. It leaves minute sand
particles imbedded in the contacts, especially silver plated ones.
Use a metal contact file or good grade of extra fine Emory cloth.

73, Jim -

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