[TMC] [Boatanchors] a stuck Jennings Vacuum Variable.

[jmfranke]

I know it sounds silly, but is the thread left or right handed.

John WA4WDL

--------------------------------------------------
From: "Mark Foltarz" <Foltarz at rocketmail.com>
Sent: Thursday, January 05, 2012 1:36 PM
To: <jfor at quikus.com>
Cc: <boatanchors at mailman.qth.net>; <amradio at mailman.qth.net>; 
<tmc at mailman.qth.net>
Subject: Re: [Boatanchors] a stuck Jennings Vacuum Variable.

> John,
>
> It is my belief that the shaft merely "pushes and pulls" the bellows in 
> and out.
> And yes, good idea on the patent diagram.
>
> It looks like the Machlett vacuum variables are very similar in design.
> And from what I can see, it seems that the brass collar is hanging up on 
> something.
> If I gently apply a twisting force to the brass collar I can see the 
> bellows move slightly.
> It is like it "wants" to move. Just something holding it back
>
>
> Mark
>
>
>
>>________________________________
>> From: Mark Foltarz <Foltarz at rocketmail.com>
>>To: "jfor at quikus.com" <jfor at quikus.com>
>>Cc: "amradio at mailman.qth.net" <amradio at mailman.qth.net>; 
>>"boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>; 
>>"tmc at mailman.qth.net" <tmc at mailman.qth.net>
>>Sent: Thursday, January 5, 2012 1:20 PM
>>Subject: Re: [Boatanchors] a stuck Jennings Vacuum Variable.
>>
>>
>>John,
>>
>>
>> I'm thinking this cap must have been really driven in
>>The collar for the shaft is off the cap.
>>The shaft threads in and out but the bellows are stationary in the "driven 
>>in all the way" position.
>>
>>
>>de KA4JVY
>>
>>
>>Mark
>>
>>
>>
>>>________________________________
>>> From: J. Forster <jfor at quikus.com>
>>>To: Mark Foltarz <Foltarz at rocketmail.com>
>>>Cc: "amradio at mailman.qth.net" <amradio at mailman.qth.net>; 
>>>"boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>; 
>>>"tmc at mailman.qth.net" <tmc at mailman.qth.net>
>>>Sent: Thursday, January 5, 2012 12:51 PM
>>>Subject: Re: [Boatanchors] a stuck Jennings Vacuum Variable.
>>>
>>>I don't but perhaps some light penetrating oil into the thread mechanism?
>>>Was it screwed into the stop hard?
>>>
>>>-John
>>>
>>>============
>>>
>>>> Group,
>>>>
>>>> Has anyone ever run across a vacuum variable that is stuck with the
>>>> bellows fully expanded ?
>>>> I have one where the bellows are stuck open.
>>>> No electrical short.
>>>> It is a Jennings UCF 500 series glass vacuum variable.
>>>> Hoping someone has has experience with this problem.
>>>>
>>>>
>>>>
>>>> tnx
>>>>
>>>> de KA4JVY
>>>>
>>>> Mark
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>>>
>>>
>>>
>>>
>>>
>>
>>
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