[GreenKeys] Weird hardware size -- getting OT

[John, W9DDD]

  Ah yes, the numbered sizes 0 through 12 (I think that's the biggest)  
Perhaps related to wire and sheet metal gauges?  And the thickness isn't 
independent of the metal involved either.  Maybe we're stuck with it 
because after you go to all the trouble to memorize it all you're 
reluctant to give it up.

Started a new job in 1972 and one of the first training sessions for new 
hires was about our transition to the metric system.  I left there 10 
year later and there hadn't been a lot of metrification going on for the 
average employee.  I only heard about new product parts designs being in 
metric.

---
----
You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD

On 11/25/2022 3:03 PM, sean wrote:
> Forgive my ignorance,  but say 4-40, the 40TPI I get, but 4 what 
> exactly? Not inches, or thousandth.....
>
> M3, M4, M5, yup, makes sense, okay two or three thread pitches might 
> be confusing....
>
> But the instrument screw system as used with American equipment 
> is.plain confusing,  even for a Brit that is used to BA, Imperial, and 
> even Whitworth.....
>
> Cheers
> Sean
> M1ECY
>
>
>
> Sent from my Galaxy
>
>
> -------- Original message --------
> From: "John, W9DDD" <w9ddd at tapr.org>
> Date: 25/11/2022 20:51 (GMT+00:00)
> To: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] Weird hardware size
>
> How do you think us yanks feel about the weird metric thread 
> nomenclature?  Diameter and threads per inch seems simple enough to me.
>
> ---
> ----
> You said "tomorrow" yesterday.
>
> The above comments or recommendations are SWAG. Use at your own risk.
> John, W9DDD
> On 11/25/2022 2:45 PM, Tomas Larsson wrote:
>>
>> For me, and us on the other side of the Atlantic, imperial sizes is a 
>> great mysterium, and we do not understand it at all.
>>
>> With best regards
>>
>> Tomas Larsson
>>
>> Borås
>>
>> Sweden
>>
>> *Från:* greenkeys-bounces at mailman.qth.net 
>> <greenkeys-bounces at mailman.qth.net> *För *til128 at juno.com
>> *Skickat:* den 25 november 2022 20:36
>> *Till:* navy.radio at gmail.com
>> *Kopia:* greenkeys at mailman.qth.net
>> *Ämne:* Re: [GreenKeys] Weird hardware size
>>
>> I believe you will find your answer here:
>>
>> https://grandbrass.zendesk.com/hc/en-us/articles/201711490-What-is-IPS-and-Why-Do-We-Use-These-Size-Threads-for-Lighting-Parts-
>>
>> Tom Tillson
>>
>> ---------- Original Message ----------
>> From: Nick England <navy.radio at gmail.com <mailto:navy.radio at gmail.com>>
>> To: Greenkeys <greenkeys at mailman.qth.net 
>> <mailto:greenkeys at mailman.qth.net>>
>> Subject: [GreenKeys] Weird hardware size
>> Date: Fri, 25 Nov 2022 14:21:27 -0500
>>
>> Well, Teletype is kind of weird in using 5-40 and 6-40 where most 
>> folks would use 6-32.
>>
>> And using 1/4-32 instead of 1/4-28.
>>
>> But who in the world decided on 1/4-27 for lampshade finials? Where 
>> did *that* come from?
>>
>> --
>>
>> Nick England K4NYW
>> www.navy-radio.com <http://www.navy-radio.com>
>>
>>
>>
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