[modeleng] Re: unknown thread
- From: "Len Smith" <parnobal2@xxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 13:18:54 +0100
This 36 tpi thread, and the 208, can be cut directly (obviously with the right
tool form) on a South Bend gearbox lathe. My single tumbler box ranges from 4
to 224, and the twin tumbler box is even more versatile.
Len Smith
----- Original Message -----
From: Tim Rickard
To: modeleng@xxxxxxxxxxxxx
Sent: Friday, October 15, 2004 1:03 PM
Subject: [modeleng] Re: unknown thread
I should get out more.
It is the Royal Microscopal Society thread devised in 1866 36 threads per
inch of the 55° Whitworth form. The male thread has an outer diameter of
0.7965 inch (between 0.7952 inch and 0.7982 inch). The female thread, in the
nosepiece, has a top-of-thread diameter between 0.8030 inch and 0.8000 inch.
>From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
>Reply-To: modeleng@xxxxxxxxxxxxx
>
>Whilst talking about unusual threads, there was a Whitworth for microscope
>and telescope eyepieces, and similar optical equipment. It was probably
>also
>used on anything where a very fine thread on a large diameter tube was
>required.
>In that respect it is different from the Whitworth Instrument thread which
>is of small diameter.
>
>Has any one any details of this large Whitworth thread?
>alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>www.alanstepney.info
>Model Engineering, Steam Engine, and Railway technical pages.
>
>
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