[Phono-L] Repairing a fiber gear

[Bob]

Hi Rich,
     The governor felt is pretty much as you described.  I will change that 
first.  If it's that easy I owe this list a Big Thank you.
Bob
----- Original Message ----- 
From: "Rich" <rich-mail at octoxol.com>
To: "Antique Phonograph List" <phono-l at oldcrank.org>
Sent: Sunday, June 21, 2009 12:32 PM
Subject: Re: [Phono-L] Repairing a fiber gear


> Most of the older fiber gears are destroyed by petroleum.  Clean it off
> and look at it real hard.  Sanding is not going to fix it.  look at the
> felt pad that the governor runs against if its oil soaked and mushed out
> the governor will flutter.  Replace the felt.  Use real felt and not
> cheap polyester.  F-1 or F-2 grade felt works.  The felt is easy, the
> gear not so.
>
> Bob wrote:
>> I'm restoring a Thorens Excelda.  I've got it running pretty well but am 
>> having a severe problem with wow and flutter.  It's so bad that it makes 
>> listening almost impossible.  The records appear to be traveling at a 
>> consistent speed but there must be minute hesitations that are impossible 
>> to see but they surely affect the sound quality.  The mainspring is 
>> plenty strong so that's not the problem and the reproducer sounds 
>> fantastic on other machines.  The problem appears to be caused by 
>> excessive wear on the fiber gear that mates with the worm gear in the 
>> governor.  A friend suggested I clean it and try to build up the bad 
>> areas with JB Weld.  I'm afraid to do this because I think it will be 
>> very difficult to control and be irreversible if I do it wrong.  I've 
>> been thinking about cleaning all the grease off of it and checking over 
>> for defects with a magnifier.  If I can see areas in the gear thread that 
>> are raised I will smooth them out with sand paper.  To try to build up an
> y areas that look low I will paint on some lacquer or urethane varnish. 
> As I mentioned earlier, the turntable appears to be rotating at a 
> consistent speed so It shouldn't take much to true up the teeth enough to 
> work properly.  I'm looking for second opinions on this technique or any 
> other technique that you think will solve the problem.  Thanks
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>>
>>
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