[TowerTalk] RE: Lubircation of Roller Inductors]

[Joe Giacobello <k2xx@swva.net>]

Doc, FYI.  I've attached messages from previous questions on this subject.

73, Joe

-------- Original Message --------
Subject: 	Re: [Amps] RE: Lubircation of Roller Inductors
Date: 	Sun, 12 Oct 2003 23:06:35 -0500
From: 	zilassoc <zilassoc@sbcglobal.net>
To: 	Paul Marbourg <zborg@comcast.net>, Amp Mailing List 
<amps@contesting.com>
References: 	<001501c37695$4c312640$0300a8c0@attbi.com>



Properly lubicating the big hard-to-turn roller inductor in my 4K-Ultra
ampifier is very appealing to me.   So, I went to the referenced web site
below, but I was confused by all the various carriers, grades and particle
percentages of molybdenum disulfide options available.  Can someone please
spoon feed me and give me a part number for a small tube of the proper
grease/lub to use on the RF Roller Inductor.  Thank You.  de K5PZ  Pete in
Dallas

----- Original Message ----- 
From: "Paul Marbourg" <zborg@comcast.net>
To: "Amp Mailing List" <amps@contesting.com>
Sent: Tuesday, September 09, 2003 12:43 AM
Subject: [Amps] RE: Lubircation of Roller Inductors


I would like to thank all the kind people who responded to my question
regarding the best lubricant for sliding contacts in an old EF Johnson
edge-wound roller inductor.  Molybdenum disulfide is the obvious winner
here.  Applied as a slurry solution in a very light film application seems
to be the best choice.  Avoiding mineral or silicone oil carriers allows for
a dry-lubricating molecular film which does not attract dust.  Unlike
graphite, which tends to be displaced by mechanical shear forces, molybdenum
disulfide bonds to the metal substrate and has innate metal-like
conductivity.  I found the web site
http://metalshopper.websitecandy.com/category.asp?category=19 Rose Mill
Company and their line of Bemol Lubricants.  They can provide bulk/small
quantities of Molybdenum Disulfide in various grades and particle sizes.

Using a metal-bearing grease type lubricant does not seem like a good choice
here.  Aside from potential hydrocarbon or silicone oil contamination of
dielectric surfaces (aka: vacuum variable insulators), the metal in the
lubricant substrate is not as efficient in conducting RF as an innately
conducting substance like molybdenum disulfide.

Now if I could just make my amp do something truly useful like mow my
lawn...................................

Thanks again for the help.
73, Paul WN7T
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