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Thread size of Sturmey-Archer oil lubricator/nipple
I read elsewhere that this was 10-24, but it's much bigger than that;
measuring the major diameter of the lubricator thread gives almost 1/4", and the pitch *seems* to be slightly finer than 1mm, so probably 26 TPI. Can anyone confirm the thread is the most likely candidate for an early 20th century British component, i.e. BSC 1/4", before I go looking for a suitable tap? I'm putting one in the shell of a hub which currently uses grease lubrication. Thanks. |
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#2
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Thread size of Sturmey-Archer oil lubricator/nipple
On Aug 13, 3:46*pm, Zog The Undeniable wrote:
I read elsewhere that this was 10-24, but it's much bigger than that; measuring the major diameter of the lubricator thread gives almost 1/4", and the pitch *seems* to be slightly finer than 1mm, so probably 26 TPI. Can anyone confirm the thread is the most likely candidate for an early 20th century British component, i.e. BSC 1/4", before I go looking for a suitable tap? *I'm putting one in the shell of a hub which currently uses grease lubrication. Thanks. I'm sorry I can't remember, but I am pretty sure it's not metric or English. They used something called Whitworth, or was it Whitworth? We called it Sturmey Archer threading. I don't think you'll find a suitable tap! Tom |
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Thread size of Sturmey-Archer oil lubricator/nipple
Tom Reingold wrote:
I'm sorry I can't remember, but I am pretty sure it's not metric or English. They used something called Whitworth, or was it Whitworth? We called it Sturmey Archer threading. I don't think you'll find a suitable tap! 1/4" Whitworth (or BSW) is still very common, because 99.999% of all cameras have it on their baseplate - it's the standard tripod thread. I've just tried the oil nipple in the bottom of a camera, and it doesn't go in fully - the pitch is different, although it does seem to be a 1/4" thread. 1/4" Whitworth is a rather coarse 20 TPI and this nipple looks more like 26 TPI. M6 (very slightly smaller diameter, 25.4 TPI because it's 1mm pitch) might be close enough for a *plastic* oil nipple; I'm trying the metal version at the moment since that's what I have around, but these don't actually have a properly oil-tight cap so are better for bling than for a bike that goes in the back of the car. I could always just use a shortened screw, but it's not very authentic-looking, and fiddly to open. |
#4
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Thread size of Sturmey-Archer oil lubricator/nipple
On Wed, 13 Aug 2008 20:46:51 +0100, Zog The Undeniable
wrote: I read elsewhere that this was 10-24, but it's much bigger than that; measuring the major diameter of the lubricator thread gives almost 1/4", and the pitch *seems* to be slightly finer than 1mm, so probably 26 TPI. Can anyone confirm the thread is the most likely candidate for an early 20th century British component, i.e. BSC 1/4", before I go looking for a suitable tap? I'm putting one in the shell of a hub which currently uses grease lubrication. Thanks. Dear Zog, Probably 2/7th inch with 33 & 1/3rd tpi. :-) A similar cry for mercy-- Er, a similar cry for help produced this suggestion to consult a Sturmey-Archer oracle via emai: "Try dropping an email to Sturmey Archer Hub Specialist Peter Read. He will probably sell you original S-A nuts in the size you are looking for." Email: --from http://oldroads.com/d_eng_ra.asp?OQI...93&RID=1949 1 Cheers, Carl Fogel |
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Thread size of Sturmey-Archer oil lubricator/nipple
Zog The Undeniable wrote in news:g7vdma$136b$1
@energise.enta.net: I read elsewhere that this was 10-24, but it's much bigger than that; measuring the major diameter of the lubricator thread gives almost 1/4", and the pitch *seems* to be slightly finer than 1mm, so probably 26 TPI. Can anyone confirm the thread is the most likely candidate for an early 20th century British component, i.e. BSC 1/4", before I go looking for a suitable tap? I'm putting one in the shell of a hub which currently uses grease lubrication. Thanks. Here's a detailed reference on British fasteners. http://www.enginehistory.org/BSFaste...eference_3.pdf or the main entry http://www.enginehistory.org/british_fasteners.htm You'll note that the English and Metric standards name by the size of the wrench that fits the nut while the Whitworth standard names by the nominal diameter of the bolt. I.e., a 1/4 Whit is a bolt that's 1/4 in diameter and 0.445 across the flats. Jsut to confuse things, there is a standard called British Standard Cycle, which was used on mototcycles. I don't know if it was used on bikes. Barry Harmon |
#6
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Thread size of Sturmey-Archer oil lubricator/nipple
Barry Harmon wrote:
Jsut to confuse things, there is a standard called British Standard Cycle, which was used on mototcycles. I don't know if it was used on bikes. It was and is. Most of the weird ISO threads are based on it. |
#7
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Thread size of Sturmey-Archer oil lubricator/nipple
On Aug 13, 6:18*pm, Barry Harmon wrote:
Zog The Undeniable wrote in news:g7vdma$136b$1 @energise.enta.net: I read elsewhere that this was 10-24, but it's much bigger than that; measuring the major diameter of the lubricator thread gives almost 1/4", and the pitch *seems* to be slightly finer than 1mm, so probably 26 TPI.. Can anyone confirm the thread is the most likely candidate for an early 20th century British component, i.e. BSC 1/4", before I go looking for a suitable tap? *I'm putting one in the shell of a hub which currently uses grease lubrication. Thanks. Here's a detailed reference on British fasteners. http://www.enginehistory.org/BSFaste...erence_3.pdfor the main entry http://www.enginehistory.org/british_fasteners.htm You'll note that the English and Metric standards name by the size of the wrench that fits the nut while the Whitworth standard names by the nominal diameter of the bolt. *I.e., a 1/4 Whit is a bolt that's 1/4 in diameter and 0.445 across the flats. Jsut to confuse things, there is a standard called British Standard Cycle, which was used on mototcycles. *I don't know if it was used on bikes. Barry Harmon Wow, I always wondered why a 1/4 inch wrench fit a nut that was almost 1/2 inch in size. I thought they were using a different inch, though I couldn't find reference to that inch. Thank you for offering that explanation! Tom |
#8
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Thread size of Sturmey-Archer oil lubricator/nipple
On Wed, 13 Aug 2008 21:57:42 +0100, Zog The Undeniable
wrote: Tom Reingold wrote: I'm sorry I can't remember, but I am pretty sure it's not metric or English. They used something called Whitworth, or was it Whitworth? We called it Sturmey Archer threading. I don't think you'll find a suitable tap! 1/4" Whitworth (or BSW) is still very common, because 99.999% of all cameras have it on their baseplate - it's the standard tripod thread. I've just tried the oil nipple in the bottom of a camera, and it doesn't go in fully - the pitch is different, although it does seem to be a 1/4" thread. 1/4" Whitworth is a rather coarse 20 TPI and this nipple looks more like 26 TPI. M6 (very slightly smaller diameter, 25.4 TPI because it's 1mm pitch) might be close enough for a *plastic* oil nipple; I'm trying the metal version at the moment since that's what I have around, but these don't actually have a properly oil-tight cap so are better for bling than for a bike that goes in the back of the car. I could always just use a shortened screw, but it's not very authentic-looking, and fiddly to open. Dear Zog, It may not suit your needs, but here's a plastic Sturmey-Archer oil nipple from Harris Cyclery; http://harriscyclery.net/itemdetails.cfm?id=816 Cheers, Carl Fogel |
#9
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Thread size of Sturmey-Archer oil lubricator/nipple
Wow, I always wondered why a 1/4 inch wrench fit a nut that was almost 1/2 inch in size. I thought they were using a different inch, though I couldn't find reference to that inch. Thank you for offering that explanation! Tom If you're interested in this sort of thing, get "Machinery's Handbook" out of your local library and skim the section on threadforms, etc. It's really fascinating reading (Really!) that shows the various methods people have used to specify nuts and bolts. You can skim the section in about 5 or 10 minutes. The standardized thread may be the most important unsung invention/development of the Industrial Revolution, one of the two or three things that made it possible. Barry Harmon |
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