[Amps] Proof of idiocy

[Gary Smith]

Fwiw, its not  whitworth thread either. If my aged memory is correct all 
whitworth was 18 tpi regardless of the diameter of the bolt or cap screw in 
question.
This is a new one on me too.
73,
Gary...wa6fgi


----- Original Message ----- 
From: "Will Matney" <craxd1 at verizon.net>
To: <amps at contesting.com>
Sent: Monday, March 13, 2006 9:35 AM
Subject: Re: [Amps] Proof of idiocy


> I've never seen nor heard of a 1/4-23 thread. The standards are 1/4-20 NC, 
> and 1/4-28 NF. I don't know of a lathe that would turn that either without 
> a special gear being made for the feed, if that's even possible over the 
> ratios. If it was odd-ball size, the thread dial might not be usable to 
> know when to throw in the half-nut lever. Most lathes are set up to turn 
> either standard inch or metric threads. I would think that the shaft of 
> those caps would be turned in a lathe or a screw machine. I did a google 
> search for 1/4-23 and came up with nothing.
>
> Best,
>
> Will
>
> *********** REPLY SEPARATOR  ***********
>
> On 3/13/06 at 8:50 AM R; Measures wrote:
>
>>On Mar 13, 2006, at 4:43 AM, HAROLD B MANDEL wrote:
>>
>>> It is possible that the threads are bunged on the
>>> leadscrew or the collar, but good  luck locating
>>> a tap or die!
>>>
>>> These threads are Jennings proprietary pitch
>>> and once fouled there is no way to chase them
>>> or to re-cut.
>>
>>The threads are 1/4 - 23 -- for which taps and dies are available.
>>>
>>> The alternative is to substitute pieces from
>>> another vacuum variable and hope for the
>>> best.
>>>
>>> If the junction that pulls the bellows on the
>>> room-pressure side is gone and the threads are
>>> still good then the piece can be used for the collars
>>> and lead screw threading.
>>>
>>> Allen Bond and Economy sell very decent vacuum
>>> variables to the amateur. I have bought several
>>> ceramic and glass types from each. The most important
>>> feature is that both of these businesses HiPot each
>>> item before it ships and will not send a DOA or
>>> leaky variable.
>>>
>>> Buyer Beware: Things seeming to be too good to be
>>> true often are.
>>>
>>> Hal
>>> W4HBM
>>>
>>>
>>>
>>>
>>> On Sun, 12 Mar 2006 19:35:08 -0500 "Will Matney" <craxd1 at verizon.net>
>>> writes:
>>>> $148 and gowing on! The only usable piece looks to me like would be
>>>> the flange on the rear. The high bidder now looks to be an
>>>> engineering firm......
>>>>
>>>> http://cgi.ebay.com/Jennings-Vacuum-Variable-Capacitor-5-kV-9-500-
>>>> pF_W0Q
>>> QitemZ7597842893
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>
>>
>>
>>Rich Measures, 805.386.3734, AG6K, www.somis.org
>
>
>
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