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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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A Question for our European brethren.
I do a lot of repair and custom work on electric lighting. This includes
retrofitting European lamps to American sockets and wiring. Here in the states, the threading and sizes on our lamp piping is all based on gas piping since our electric lamp industry evolved from our gas light industry. On the European lamps (mostly British and French) there is a thread I have never been able to figure out. It appears to be about 19tpi (or perhaps 1.33mm) and runs around .415 in. outside dia (or perhaps 10.5mm). It doesn't seem to match anything. I made myself a tap several years ago, but it is wearing out and I would love to find a real tap for it. Unfortunately I don't even know what size to look for. Any help would be greatly appreciated. Paul K. Dickman |
#2
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A Question for our European brethren.
From your details and the following link it might be the Holtzapfels
Threads thread (HOLTZ) listed http://www.watchman.dsl.pipex.com/thread.html . From my experience much of the UK lighting thread is BSB (British Standard Brass) but that is 26 TPI so not an option, the common new close replacement being M10 x 1. 19 TPI is used for BSP but at a slightly smaller diameter than you have listed. From a quick google not much information on the Holtzapfels Thread but its a start. IIRC some European thread are designated with a G prefix but I can't think where, normally on pipe threads though. Paul K. Dickman wrote: I do a lot of repair and custom work on electric lighting. This includes retrofitting European lamps to American sockets and wiring. Here in the states, the threading and sizes on our lamp piping is all based on gas piping since our electric lamp industry evolved from our gas light industry. On the European lamps (mostly British and French) there is a thread I have never been able to figure out. It appears to be about 19tpi (or perhaps 1.33mm) and runs around .415 in. outside dia (or perhaps 10.5mm). It doesn't seem to match anything. I made myself a tap several years ago, but it is wearing out and I would love to find a real tap for it. Unfortunately I don't even know what size to look for. Any help would be greatly appreciated. Paul K. Dickman |
#3
Posted to rec.crafts.metalworking
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A Question for our European brethren.
"David Billington" wrote in message ... From your details and the following link it might be the Holtzapfels Threads thread (HOLTZ) listed http://www.watchman.dsl.pipex.com/thread.html . From my experience much of the UK lighting thread is BSB (British Standard Brass) but that is 26 TPI so not an option, the common new close replacement being M10 x 1. 19 TPI is used for BSP but at a slightly smaller diameter than you have listed. From a quick google not much information on the Holtzapfels Thread but its a start. IIRC some European thread are designated with a G prefix but I can't think where, normally on pipe threads though. Thanks. I run into the M10x1 pretty regularly. When I do, I do a little dance of thankfulness. I have probably into BSB but it is so close to our 27TPI thread and the engagement is so short, I probably just threaded the socket on and didn't notice. The Holtzapfels thread shows as 19.9 TPI. This one falls exactly between the 18 and 20 pitch blades on my gauge, so I doubt that is it. That is a great chart though. I will try to google up something on the G prefix threads. Thanks Paul K. Dickman |
#4
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A Question for our European brethren.
Info here
http://www.webster-inst.com/techinfo...r/pipeconn.htm shows G prefix means Gas thread and is I think the same as BSP. A search for 19 TPI turned up this reference to 7/16 x 19 http://www.vintagecarparts.co.uk/en/...ipple-details/ . These guys list a 7/16 x 19 http://www.uni-thread.com/tdcycle.html . Search was 19 tpi thread, maybe that is close enough for your purpose. Paul K. Dickman wrote: "David Billington" wrote in message k... From your details and the following link it might be the Holtzapfels Threads thread (HOLTZ) listed http://www.watchman.dsl.pipex.com/thread.html . From my experience much of the UK lighting thread is BSB (British Standard Brass) but that is 26 TPI so not an option, the common new close replacement being M10 x 1. 19 TPI is used for BSP but at a slightly smaller diameter than you have listed. From a quick google not much information on the Holtzapfels Thread but its a start. IIRC some European thread are designated with a G prefix but I can't think where, normally on pipe threads though. Thanks. I run into the M10x1 pretty regularly. When I do, I do a little dance of thankfulness. I have probably into BSB but it is so close to our 27TPI thread and the engagement is so short, I probably just threaded the socket on and didn't notice. The Holtzapfels thread shows as 19.9 TPI. This one falls exactly between the 18 and 20 pitch blades on my gauge, so I doubt that is it. That is a great chart though. I will try to google up something on the G prefix threads. Thanks Paul K. Dickman |
#5
Posted to rec.crafts.metalworking
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A Question for our European brethren.
"David Billington" wrote in message ... Info here http://www.webster-inst.com/techinfo...r/pipeconn.htm shows G prefix means Gas thread and is I think the same as BSP. A search for 19 TPI turned up this reference to 7/16 x 19 http://www.vintagecarparts.co.uk/en/...ipple-details/ . These guys list a 7/16 x 19 http://www.uni-thread.com/tdcycle.html . Search was 19 tpi thread, maybe that is close enough for your purpose. That 7/16-19 will probably work. Still wish I knew what it's origins were. Paul K. Dickman |
#6
Posted to rec.crafts.metalworking
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A Question for our European brethren.
Paul K. Dickman wrote:
On the European lamps (mostly British and French) there is a thread I have never been able to figure out. Are you asking for the light bulb's thread? Or where "on the lamp" is the thread you mean? Nick -- Motor Modelle // Engine Models http://www.motor-manufaktur.de DIY-DRO - YADRO - Eigenbau-Digitalanzeige |
#7
Posted to rec.crafts.metalworking
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A Question for our European brethren.
No, it is the piping thread. The socket gets screwed onto it.
Paul K. Dickman ""Nick Müller"" wrote in message ... Paul K. Dickman wrote: On the European lamps (mostly British and French) there is a thread I have never been able to figure out. Are you asking for the light bulb's thread? Or where "on the lamp" is the thread you mean? Nick -- Motor Modelle // Engine Models http://www.motor-manufaktur.de DIY-DRO - YADRO - Eigenbau-Digitalanzeige |
#8
Posted to rec.crafts.metalworking
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A Question for our European brethren.
Paul K. Dickman wrote:
No, it is the piping thread. The socket gets screwed onto it. Nothing metric. Nick -- Motor Modelle // Engine Models http://www.motor-manufaktur.de DIY-DRO - YADRO - Eigenbau-Digitalanzeige |
#9
Posted to rec.crafts.metalworking
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A Question for our European brethren.
Paul K. Dickman wrote: I do a lot of repair and custom work on electric lighting. This includes retrofitting European lamps to American sockets and wiring. Here in the states, the threading and sizes on our lamp piping is all based on gas piping since our electric lamp industry evolved from our gas light industry. On the European lamps (mostly British and French) there is a thread I have never been able to figure out. It appears to be about 19tpi (or perhaps 1.33mm) and runs around .415 in. outside dia (or perhaps 10.5mm). It doesn't seem to match anything. I made myself a tap several years ago, but it is wearing out and I would love to find a real tap for it. Unfortunately I don't even know what size to look for. Any help would be greatly appreciated. Paul K. Dickman go here http://www.redapt.co.uk/index.htm they have pdf's for download etc and products that may save you a lot of work |
#10
Posted to rec.crafts.metalworking
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A Question for our European brethren.
Thanks to all who responded.
After seeing Dave Billington searching on "19 TPI" I did the same and found a reference to it as an obsolete thread called "Copper pipe thread". Thanks again Paul K. Dickman See below; 1.. Thread "Pas des becs" by Robert GIRARD ) Posted: Nov. 11, 2002 @ 14:22. Hello I repair lamps in Provence, Luberon, France !!!! Could someone help me to find the origin of threadings used in lamps, called in France "pas français" : "Pas des Becs", or "Pas des becs de cuivre" = 10,85 mm diameter and 1,33mm thread (19 thread/inch) ??? - and the others : "Pas de Paris" (16,85mm diam.) and "Pas de Rouen" (!!!???!!!) ????? and the threads (may be Withworth ? Empire ? or other ?) used to screwed ancient statuettes on their marble base Thanks Best rgds RG 1.. On Nov. 11, 2002 @ 17:47, Alex Marrack ) wrote: Thread names are often confusing, the first one you mention is the one often used on French Gas burners and earlier French electric lamps. It is a whitworth form thread, and is a 'non standard' size of English Pipe thread, now standardised as British Standard Pipe thread, but dating back to about 1820 and maybe before. The 19 TPI persists and is still used for 1/4" and 3/8" pies now (these threads are bigger than the name implies and the 1/4 inch size pipe has an OD of nearly half an inch (Dont ask!) The odd size thread was used over here (UK) and called Copper pipe thread, not widely used for over 100 year. |
#11
Posted to rec.crafts.metalworking
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A Question for our European brethren.
Good work, you must have sifted through quite a lot. I always get a lot
of references to threads in computer programs clouding the search when on the thread subject. Thats not to bad for me as I program for a living but it doesn't help when looking for screw threads. Many of the modern metric pipe threads are BSP in metric dimensions so the reference 1 may very well be an obsolete english thread as mentioned in 2. Searching for "copper pipe thread" turns up an awful lot to sift through. What the next move?. If its that old and obsolete then you may not have much luck finding info on the web. Whatever you find you may have to resort to making another yourself unless the 7/16 x 19 is close enough. I am not quite sure where I would start to look for a thread that old and i'm in the UK, possibly send someone an email at the science museum in London http://www.sciencemuseum.org.uk/ . I'll mention it to a friend who has a thing about thread systems and see where he would start. Paul K. Dickman wrote: Thanks to all who responded. After seeing Dave Billington searching on "19 TPI" I did the same and found a reference to it as an obsolete thread called "Copper pipe thread". Thanks again Paul K. Dickman See below; 1.. Thread "Pas des becs" by Robert GIRARD ) Posted: Nov. 11, 2002 @ 14:22. Hello I repair lamps in Provence, Luberon, France !!!! Could someone help me to find the origin of threadings used in lamps, called in France "pas français" : "Pas des Becs", or "Pas des becs de cuivre" = 10,85 mm diameter and 1,33mm thread (19 thread/inch) ??? - and the others : "Pas de Paris" (16,85mm diam.) and "Pas de Rouen" (!!!???!!!) ????? and the threads (may be Withworth ? Empire ? or other ?) used to screwed ancient statuettes on their marble base Thanks Best rgds RG 1.. On Nov. 11, 2002 @ 17:47, Alex Marrack ) wrote: Thread names are often confusing, the first one you mention is the one often used on French Gas burners and earlier French electric lamps. It is a whitworth form thread, and is a 'non standard' size of English Pipe thread, now standardised as British Standard Pipe thread, but dating back to about 1820 and maybe before. The 19 TPI persists and is still used for 1/4" and 3/8" pies now (these threads are bigger than the name implies and the 1/4 inch size pipe has an OD of nearly half an inch (Dont ask!) The odd size thread was used over here (UK) and called Copper pipe thread, not widely used for over 100 year. |
#12
Posted to rec.crafts.metalworking
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A Question for our European brethren.
"David Billington" wrote in message ... Good work, you must have sifted through quite a lot. I always get a lot of references to threads in computer programs clouding the search when on the thread subject. Thats not to bad for me as I program for a living but it doesn't help when looking for screw threads. Many of the modern metric pipe threads are BSP in metric dimensions so the reference 1 may very well be an obsolete english thread as mentioned in 2. Searching for "copper pipe thread" turns up an awful lot to sift through. What the next move?. If its that old and obsolete then you may not have much luck finding info on the web. Whatever you find you may have to resort to making another yourself unless the 7/16 x 19 is close enough. I am not quite sure where I would start to look for a thread that old and i'm in the UK, possibly send someone an email at the science museum in London http://www.sciencemuseum.org.uk/ . I'll mention it to a friend who has a thing about thread systems and see where he would start. That 7/16-19 tap will probably work fine. These threads just hold stuff together. They don't need to seal anything. Still, I would love to find the right thread in a spiral point machine tap. Then I could just set up my tapping head and blast out all the sockets I will ever need in a couple of hours. Paul K. Dickman |
#13
Posted to rec.crafts.metalworking
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A Question for our European brethren.
I do a number of modifications to lamps for a friend here in the UK and
have not run across this thread, but saying that one will probably turn up next week. Are these items which have been in the US for many years or have they recently been imported. Do you have any idea of the vintage. I presume a tap is required as you are modifying a ready made part which would be a pain to set-up for thread cutting. Paul K. Dickman wrote: "David Billington" wrote in message k... Good work, you must have sifted through quite a lot. I always get a lot of references to threads in computer programs clouding the search when on the thread subject. Thats not to bad for me as I program for a living but it doesn't help when looking for screw threads. Many of the modern metric pipe threads are BSP in metric dimensions so the reference 1 may very well be an obsolete english thread as mentioned in 2. Searching for "copper pipe thread" turns up an awful lot to sift through. What the next move?. If its that old and obsolete then you may not have much luck finding info on the web. Whatever you find you may have to resort to making another yourself unless the 7/16 x 19 is close enough. I am not quite sure where I would start to look for a thread that old and i'm in the UK, possibly send someone an email at the science museum in London http://www.sciencemuseum.org.uk/ . I'll mention it to a friend who has a thing about thread systems and see where he would start. That 7/16-19 tap will probably work fine. These threads just hold stuff together. They don't need to seal anything. Still, I would love to find the right thread in a spiral point machine tap. Then I could just set up my tapping head and blast out all the sockets I will ever need in a couple of hours. Paul K. Dickman |
#14
Posted to rec.crafts.metalworking
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A Question for our European brethren.
"David Billington" wrote in message ... I do a number of modifications to lamps for a friend here in the UK and have not run across this thread, but saying that one will probably turn up next week. Are these items which have been in the US for many years or have they recently been imported. Do you have any idea of the vintage. I presume a tap is required as you are modifying a ready made part which would be a pain to set-up for thread cutting. These are recently imported, but of antique or certainly vintage manufacture. In retrospect, they may mostly have been French lamps, but almost all the sockets of British manufacture. They make an adapter for the bi-pin base bulbs to our American style screw shell bulbs, but through bad design, it is conceivable that the customer could reverse the adapter or change the plug and end up with the entire metal exterior of the fixture attached to the hot side of the wiring. Even in proper assembly it leaves the body attached to the neutral lead. Needless to say, I refuse to use them. The pipe is slightly larger in diameter than our standard 1/8"- 27 pipe. The simplest and cleanest fix is to ream out one of our socket bases and re-thread it to match. Because of clearance and mounting issues, it is usually extremely difficult to re-thread the piping. Paul K. Dickman |
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