[modeleng] Re: unknown thread
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 12:27:23 +0100
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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