[modeleng] Re: Unknown thread
- From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 15 Oct 2004 08:42:14 +0000
Alan
I'm not sure if they are 60 deg threads.
My recollection was that in accordance with our Imperialist traditions we
stole the Thury thread off the French Swiss because they obviously couldn't
be trusted with it with them being foreign chappies and rebranded it as the
BA thread.
Certainly there are a lot of very close similiarites between the Thury and
BA dimensions but I'm not certain without some delving which I'll try and do
what the angle was. I tather think it may be the same as BA
Good luck to our correspondent in trying to cut one of these threads
whatever the angle.
>From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
>Thury threads were a Swiss thread mainly used by clock and watch makers,
>and
>by extension, by instrument makers.
>Some other countries also adopted them.
>20 Thury is 0.0189" diameter, (0.479mm), and 208.2 tpi.
>core diameter is 0.0134", and thread depth is 0.030".
>Sorry, but you will have to convert them to metric if that is what you
>need.
>
>Although the chart I have doesnt say so, I am fairly sure that they were 60
>degree angle,
>
>alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
>www.alanstepney.info
>Model Engineering, Steam Engine, and Railway technical pages.
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