[sdiy] goop on pots

[Tim Johnson]

I recently got my hands on an old H.P 651A audio oscillator and the vernier 
control was "glued".
The simple fix was to remove the knob and carefully heat the shaft (no 
jokes) with a lighter or small torch and apply any good solvent or WD30 and 
work the shaft out (don't even think about it.)
Then I reapplied some new silicone damping oil and it was good as new.
Although pots may be a bigger challenge they should be able to be removed 
and dismantled.
Also be carefull not to overheat them if the wiper is nylon or plastic.

Now go... work your... shaft or something.

Jim

>From: Colin Hinz <asfi at eol.ca>
>To: Synth-Diy <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] goop on pots
>Date: Thu, 14 Oct 2004 02:02:17 -0400 (Eastern Daylight Time)
>
>On Wed, 13 Oct 2004, Roy J. Tellason wrote:
>
> > I'm sure that some of you guys must have run into the problems with the
> > "lubricant" that Tapco used on their pot shafts,  where the stuff tends 
>to
> > stiffen up over time,  and has in at least some instances that I know of
> > locked a control up solid.  I've even seen some cases where they shaft
> > snapped before the junk would let go.
> >
> > Anyhow,  I'm looking for tips on this stuff,  any solvent that'll deal 
>with
> > it,  and any technique that'll help me get it out of there without 
>getting it
> > into the resistance element itself...
>
>I'd love to know about this too. Fortunately, I haven't had a problem with
>siezed lubricant in pots, but I've got a growing collection of useless
>dehumidifier motors. At $40 a motor I hate replacing them, but it's a
>whole lot better than buying new applicances. But anyways.....
>
>- Colin Hinz
>   Toronto, Canada
>
>

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