[modeleng] Re: Unknown Thread
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 15:12:50 +0100
George, Don't know about "learning", right now you are teaching.
Thank you for the info on Thury threads. Now I have all the data on them I
will add it to my website in case it is of use to someone else in the
future.
The list is set not to accept attachments, and I don't think a scan would go
through either.
The only answer is to send individual emails direct to another member,
although if there is ever anything that several people request, I am always
happy to host it on my website so people can then download it.
alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
www.alanstepney.info
Model Engineering, Steam Engine, and Railway technical pages.
----- Original Message -----
From: "georgecoles" <georgecoles@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, October 15, 2004 2:54 PM
Subject: [modeleng] Re: Unknown Thread
My wife has just plonked "Machinery's Screw Thread Book" (11th Edition,
published 1941) on my lap. It was published by The Machinery Publishing Co.
Ltd. of Euston Rd NW1 (War address: 17 Marine Parade, Brighton 1. 'Frying
pans and Fires ?)
On the first page of the section on 'British association Thread' after some
preamble, and a defining drawing, the following appears:
Designation:- B.A. : sometimes the Swiss or Thury thread on which the
B.A. system is based. In the Swiss prototype the thread was rounded off at
the top and bottom of the triangle by a radius equal to 1/6 p at the top and
1/5 p at the bottom, whereas in the B.A. thread the top and bottom of the
threads are both rounded to the same radius, viz. 2/11 p.
I don't even remember having this book, which has a myriad of screw threads
systems defined therein, including 'The Progress System' for watch screws,
which originated in Switzerland, is based upon the Thury thread, but has a
thread angle of 50 degrees.
I don't know if a scan, inserted rather than attached, would work on this
list, but I'll try if anyone wants the BA or any other thread diagram.
George Coles
Lurking and learning.
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