I’m dubious about using conducting grease for roller inductors.
Generally, I’ve used a thin coating of dielectric silicone grease for
that kind of application. The purpose is to lubricate the roller
connection, to keep moisture out, and to inhibit oxidation. Under the
pressure of the roller against the coil, there’s a good metal-to-metal
contact. Using silver bearing grease as an interface between the
roller and the inductor surface just puts a lossy, grainy material
where it will do no good. Conducting grease is mostly useful where one
needs a good thermal bond, as on a CPU IC or heat sink surface.
This debate comes up regularly with respect to lubricating the center
pin of PL259 connectors. Although it seems counterintuitive, using a
small amount of pure silicone grease is far better than putting a
conducting lubricant on the center pin.
73,
Jim w8zr
Sent from my iPhone
> On Jan 2, 2020, at 10:11 AM, Jim Thomson <jim.thom@telus.net> wrote:
>
> Date: Sun, 29 Dec 2019 11:02:34 -0600
> From: Rob Atkinson <ranchorobbo@gmail.com>
> To: "Lou Everett, Sr." <loueverettsr@gmail.com>, "amps@contesting.com"
> <amps@contesting.com>
> Subject: Re: [Amps] Dielectric grease for roller inductors?
>
> <MG Chemicals Silver Conductive Grease. Cat. No. 8463-7g 7 grams 1/4
> <oz. http://www.mgchemicals.com Toronto Canada 1-800 201 8822
> <https://www.mgchemicals.com/products/greases-and-lubricants/conductive-greases/silver-conductive-grease-8463
>
> <Comes in a syringe dispenser. $22 on Amazon. Getting enough to smear
> <all over an inductor would cost more than the inductor.
>
> <73
>
> <Rob
> <K5UJ
>
> ## since I have to order more...cool-amp silver plating compound,
> I will also order some...conducto-lube at the same time.
> Its way cheaper vs buying the MG chemicals silver conductive
> grease. 2/4 ozs will last a long time. Indefinite shelf life.
>
> ## Conducto lube is 75% pure silver and 25% mineral oil. Its made
> for sliding contacts, and mine are all sliding.
>
> ## I will also experiment with it on some spare model 88 band
> switches I have in the shop.
>
> ## 1 oz covers 480 square inches. Comes in 1-2-4-8 oz containers.
>
> Jim VE7RF
>
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