[HBR] Eddystone Three Section Variable Capacitor Question

[Whitebear1122]

After carefully remeasuring two or three times, the diameter is 0.137" or 0.138".   There is maybe 1 turn's worth of shank, plus I counted 16 turns.  If I add the shank as a turn that's 17 turns over 0.475" which comes out to 35 turns/inch which doesn't quite jive.  The 4-40 is 0.137"-0.138" diameter so that works.  The 6-40's 40 turns/inch doesn't quite work out but the Whitworth's 1/8" (0.125") seems a bit small.  Sorry for the confusion.  

It looks like my application would need two 1" screws and 6 nuts to get the capacitor stood off the chassis and snugged down tightly, and allow bit of alignment.

73, Scott WA9WFA

On Mar 14, 2014, at 7:03 PM, Walt Hutchens <waltah at earthlink.net> wrote:

> Whitebear1122 said:
> 
>> I was thinking it was metric but I hadn't considered something odd
>> like 4-32 or 6-40.  After measuring up a broken piece of mounting
>> hardware I measured about 11 turns in it's 0.29" length so that
>> comes out to be 37T/inch which must be 40T/inch, and a diameter like a #6 =  6-40.
> 
> 1/8"-40 is a Whitworth size.  If you have a broken piece of it you
> should be able to confirm or deny that by measuring the diameter --
> the nominal diameter would be 1/8".
> 
> Walt Hutchens
> KJ4KV
> 
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