doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Whitworth threads

Just an idea but is it possible to fill the hole with epoxy putty or the like, when cured, screw it back out and use a thread gauge on the imprint ?
I'm guessing a bit of oil or butter would stop the epoxy sticking fast and will help when it comes to winding the "blob" out.

El Garro's suggestion is not bad, but I would use cerrosafe instead.
Mike

http://britishfasteners.com/bolts.html

1.315.946.9400

7696 Route 31, Lyons NY 14489 USA

In most cases the British gun trade used three basic thread series; British Standard Whitworth [BSW], British standard fine[BSF] and British Association [BA].they tended to use off standard sizes for example BSF 9/32 or 3BA.By using off standard sizes,it was in my opinion an attempt to limit the ability of those outside the trade to repair or supply parts. This use of off-standard threads is very apparent in the thread series used on British cleaning rods and associated bore cleaning tools.
As stated by others due to thread geometry American and Unified threads will not interchange with same diameter/pitch Whitworth thread series.

When I was cutting metric threads for Italian bicycle and motorcycle pieces the microcomparator machine said that the original threads were 55deg on every part that I checked. Those were old manufactured parts. There were several metric "standards" in different countries and at some point in time the "new" international metric standards were implemented world-wide. If it's old Italian you'd best get it in a comparator.
The Whitworth (BSW) was 55deg, BSF were indeed 60deg and the BA were 47.5deg.
If you're gonna be cutting any of these you'd best get a copy of Machinery's Handbook and discover just what it is you have before you flip the switch. All of the formulas for dia/pitch/depth are in there.

JIC you don't know about this https://en.wikipedia.org/wiki/Optical_comparator

What Mr. Hebbes says about limiting availability is the essence of British industry. Especially since if it's Brit there is gonna be a LARGE replacement parts market.

have another day
Dr.WtS

I restored a MGTD including rebuilding the engine. I had a set of Whitworth sockets, so I thought I had it covered. Not so! Working on the car I would discover not only Whitworth was used but, English Standard and unexpectedly metric bolts and nuts were used. It drove me nuts. Years later I would discover that after WWII the English bought up German metric bolts and nuts cheaply and put them in their cars and machinery. I have been frightened of English mechanical things ever since. I'll get that book.