[Amps] Proof of idiocy

[Will Matney]

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
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>>
>>
>
>
>
>Rich Measures, 805.386.3734, AG6K, www.somis.org