[modeleng] Re: unknown thread
- From: "Terry Lane" <tel@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 21:32:44 +1000
Ol' Whitworth didn't do a bad job, except for 3/16W which (in my 'umble
opinion) has too small a core diameter
----- Original Message -----
From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, October 15, 2004 9:27 PM
Subject: [modeleng] Re: unknown thread
> Whitorth worked out his standard, based upon lots of samples of existing
> threads, plus some calculations (guesses) of the ideal thread.
>
> Sellers did the same in the USA. (A few years later, it must be said.)
>
> Meanwhile, on that bit of land off the coast of England, they worked out
> their own threads.
> At one time, the Germans, French and Swiss all had their own standards,
but
> these gradually came down to a few, then eventually to one, Metric. They
> then foisted it on the rest of humanity.
> alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> www.alanstepney.info
> Model Engineering, Steam Engine, and Railway technical pages.
>
>
>
> ----- Original Message -----
> From: <peter.chadwick@xxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Friday, October 15, 2004 12:03 PM
> Subject: [modeleng] Re: unknown thread
>
>
> Can anyone explain how/why the different thread angles appeared? I thought
> it was accepted that the first 'standardised' thread was BSW, which is a
> 55 degree thread, and this was followed by BSF, also a 55 degree. When and
> why did the 60 degree of US standard and metric appear? For that matter,
> why 47.5 degrees for BA/Thrury ?
> Peter Chadwick
>
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