Thanks, will look for something appropriate
-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of jimlux
Sent: December 4, 2020 2:35 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Variac problem.
On 12/4/20 10:37 AM, Forrest Mohrman wrote:
> Shaun....have had the same problem with 4 different units. The brushes
> corrode into place and allow arcing to the windings and the burn a turn.
> You have to gently tap back and forth to get it loose......take you
> time......it will come free.
>
> When you are loose take the sides and lightly sand the corrosion off so
> the brush so it slides freely in the slot. Might have to sand the slot
> also. A nail file comes in handy. No oil! Can use graphite powder for
> lube.
>
> Bud
>
>
I'm not sure I'd use graphite powder (a conductor) as lube on a variac.
I'd go for some sort of contact cleaner/lube as used for things like
rotary switches.
But checking the Superior Electric or other variac maker website might
be useful.
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