Thank heaven for the metric system?

[enfieldspares]

Need a rear triggerguard pin (screw) for my 1927 made French Fusil Robust Model 28E as the thread at its end had stripped and the trigger guard at the rear was wobbly. Very noticeable after putting a box of Eley VIP Game through it that the more cartridges you fired the more wobbly it got! And it had been like that for the last five of the twenty years I've owned it. But, thinks I, its standard metric isn't it?

So what to do? Well other than the length of the threaded portion I found the exact same pin (screw) in terms of pitch, head diameter, slot and head depth on a scrapped forend iron from a Spanish 1970s AYA Yeoman non-ejector. So other than slowly, a couple of thread depths at a time it was merely a task of grinding the threaded portion to length and using it replace the stripped pin (screw) in the 1927 gun.

So in that respect thank heavens for the metric system as if this had been a 1927 English gun I'd likely have had to have that replacement pin bespoke made. But here? Job done!

 

[John Gryphon]

Need a rear triggerguard pin (screw) for my 1927 made French Fusil Robust Model 28E as the thread at its end had stripped and the trigger guard at the rear was wobbly. Very noticeable after putting a box of Eley VIP Game through it that the more cartridges you fired the more wobbly it got! And it had been like that for the last five of the twenty years I've owned it. But, thinks I, its standard metric isn't it?

So what to do? Well other than the length of the threaded portion I found the exact same pin (screw) in terms of pitch, head diameter, slot and head depth on a scrapped forend iron from a Spanish 1970s AYA Yeoman non-ejector. So other than slowly, a couple of thread depths at a time it was merely a task of grinding the threaded portion to length and using it replace the stripped pin (screw) in the 1927 gun.

So in that respect thank heavens for the metric system as if this had been a 1927 English gun I'd likely have had to have that replacement pin bespoke made. But here? Job done!

Metric system? Imagine the dolts of today trying to work out the old system (Imp) ha ha the dolts of yesteryear couldn't either. As an aside the old Imp system was a joke especially with pounds and guineas for example, what effn genius came up with that ffs.

 

[Smellydog]

 

[Smellydog]

Most old English or other vintage threads and screws can be matched very very close with existing options.
There are metric variations in pitch and threads per pin diameter.
British association (BA) are readily available and cross over well to some other obscure threads.
Taps can often easily convert an existing threaded hole.

 

[8x57]

As an aside the old Imp system was a joke especially with pounds and guineas for example, what effn genius came up with that ffs.

Auctioneers actually.
You're probably already aware John but for the benefit of those that aren't the extra shillings was put on the sale price as commission for the seller/auctioneer.

 

[John Gryphon]

Auctioneers actually.
You're probably already aware John but for the benefit of those that aren't the extra shillings was put on the sale price as commission for the seller/auctioneer.

Yes and now it's a proper percentage.. bastards.

 

[kenbro]

Need a rear triggerguard pin (screw) for my 1927 made French Fusil Robust Model 28E as the thread at its end had stripped and the trigger guard at the rear was wobbly. Very noticeable after putting a box of Eley VIP Game through it that the more cartridges you fired the more wobbly it got! And it had been like that for the last five of the twenty years I've owned it. But, thinks I, its standard metric isn't it?

So what to do? Well other than the length of the threaded portion I found the exact same pin (screw) in terms of pitch, head diameter, slot and head depth on a scrapped forend iron from a Spanish 1970s AYA Yeoman non-ejector. So other than slowly, a couple of thread depths at a time it was merely a task of grinding the threaded portion to length and using it replace the stripped pin (screw) in the 1927 gun.

So in that respect thank heavens for the metric system as if this had been a 1927 English gun I'd likely have had to have that replacement pin bespoke made. But here? Job done!

Can’t imagine Whitworth threads being used for ‘27 English guns, so would they have been BSF?
Kb.

 

[enfieldspares]

Can’t imagine Whitworth threads being used for ‘27 English guns, so would they have been BSF?
Kb.

Yes. That's the problem there were so many threads I'd have been lucky to find straight away in less than the minute it took a direct fit with both thread size and pitch and head the same dimensions.

 

[timbrayford]

Metric system? Imagine the dolts of today trying to work out the old system (Imp) ha ha the dolts of yesteryear couldn't either. As an aside the old Imp system was a joke especially with pounds and guineas for example, what effn genius came up with that ffs.

Thats simple, livestock was auctioned in guineas, the extra shilling was the auctioneers commission

 

[Kalahari]

Wouldn't it be lovely if auctioneers only charged 5% commission!

David.

 

[Kalahari]

Funnily enough the DIN thread used for diving gas is a British gas thread, because it seals better and I was told the barrel tenon for a Mauser '98 is a Whitworth but they might have just been conning me!

David.

 

[Smellydog]

WHITWORTH AND OTHER BRITISH THREADS | JRC Engineering, Inc.

Whitworth Thread Chart with SAE reference pdf British Thread in Detail pdf Model Engineering and British Pipe Threads Article Whitworth and...

www.jrcengineering.com

 

[8x57]

Wouldn't it be lovely if auctioneers only charged 5% commission!

David.

Yes that would be nice, now it's more like 25% with both buyers and sellers commission. Plus you have the dreaded V.A.T. to add.
You now have to think very carefully before giving the auctioneer the wink or putting you hand up in an auction.

 

[AHPP]

 

[AHPP]

I was told the barrel tenon for a Mauser '98 is a Whitworth

For an otherwise well designed thing, the threads are stupid. I think there's a buttress thread on the shroud with a metric diameter and an imperial pitch, or something similarly silly.

 

[trickie]

One of the many reasons for multiple threads and pitches on old -very old engineering, was to protect the the device from repairs by other engineers who used different threads and pitches to protect their intellectual properties.
Not that it was successful

 

[Tim.243]

Funnily enough the DIN thread used for diving gas is a British gas thread, because it seals better and I was told the barrel tenon for a Mauser '98 is a Whitworth but they might have just been conning me!

David.

I was given a large bottle of propane as the LH thread would not accept the std propane fittings so no one wanted it..!
BSB pitch but bigger od. I worked out a drawing for my friend as my old lathe has no selection change gears so Mike did the thread off the blank I gave him.
Fitted a treat just swapped out the std nut on to the bull-nose fitting.
DIN are a great mechanical fitting but day in day out coming of dive boats on jetty's to be filled then I have had them knocked and the thread will be tight so a din reg would not fit and people (guests ) would be ****ed off.

I decant my O2 into a smaller O2 bottle these days as the days using my old diving O2 set up.