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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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Eyetalian Threads, ca. 1950
There was a thread here about a month ago about restoring an Italian
espresso machine that had metric diameter parts with 'merican thread pitches. So I was visiting my sister, and my nephew asks if I can make him a part for an accordion and hands we a little bent piece of wire that -- shoot me if I'm wrong -- is threaded with 3mm x 40TPI at the ends. Cool. I started talking about this and my sister accused me of not really belonging in the family seeing as how I'm one of those _restorer_ freaks, and not the least bit a hot rodder. So of course then I had to start talking about getting just the right alloy of 3mm brass stock, and finding a plater, and about how maybe it would be a crime to fix the damn thing AT ALL because that would mess up it's provenance. Fun fun. (the part is made, with 1/8" drill rod and 4-40 threads). -- http://www.wescottdesign.com |
#2
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Eyetalian Threads, ca. 1950
On Tue, 04 Aug 2009 23:38:38 -0500, Tim Wescott
wrote: There was a thread here about a month ago about restoring an Italian espresso machine that had metric diameter parts with 'merican thread pitches. So I was visiting my sister, and my nephew asks if I can make him a part for an accordion and hands we a little bent piece of wire that -- shoot me if I'm wrong -- is threaded with 3mm x 40TPI at the ends. Cool. I started talking about this and my sister accused me of not really belonging in the family seeing as how I'm one of those _restorer_ freaks, and not the least bit a hot rodder. So of course then I had to start talking about getting just the right alloy of 3mm brass stock, and finding a plater, and about how maybe it would be a crime to fix the damn thing AT ALL because that would mess up it's provenance. Fun fun. (the part is made, with 1/8" drill rod and 4-40 threads). are the threads 55degree angle or 60 degree angle? eighth inch whitworth is 40 tpi |
#3
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Eyetalian Threads, ca. 1950
Stealth Pilot wrote:
Fun fun. (the part is made, with 1/8" drill rod and 4-40 threads). are the threads 55degree angle or 60 degree angle? eighth inch whitworth is 40 tpi 1/8" British Standard Cycle thread is also 40 tpi, but is 60 degree rather than Whitworth's 55 deg thread form. Jordan |
#4
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Eyetalian Threads, ca. 1950
On Wed, 05 Aug 2009 06:43:29 +0000, Stealth Pilot wrote:
On Tue, 04 Aug 2009 23:38:38 -0500, Tim Wescott wrote: There was a thread here about a month ago about restoring an Italian espresso machine that had metric diameter parts with 'merican thread pitches. So I was visiting my sister, and my nephew asks if I can make him a part for an accordion and hands we a little bent piece of wire that -- shoot me if I'm wrong -- is threaded with 3mm x 40TPI at the ends. Cool. I started talking about this and my sister accused me of not really belonging in the family seeing as how I'm one of those _restorer_ freaks, and not the least bit a hot rodder. So of course then I had to start talking about getting just the right alloy of 3mm brass stock, and finding a plater, and about how maybe it would be a crime to fix the damn thing AT ALL because that would mess up it's provenance. Fun fun. (the part is made, with 1/8" drill rod and 4-40 threads). are the threads 55degree angle or 60 degree angle? eighth inch whitworth is 40 tpi They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. -- http://www.wescottdesign.com |
#5
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Eyetalian Threads, ca. 1950
On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott
wrote: They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. The limits on the major diameter of a 5-40 UNC-2A thread are ..1242/.1191 -- within .001 of 3mm. -- Ned Simmons |
#6
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Eyetalian Threads, ca. 1950
On Wed, 05 Aug 2009 22:24:52 -0400, Ned Simmons wrote:
On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott wrote: They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. The limits on the major diameter of a 5-40 UNC-2A thread are .1242/.1191 -- within .001 of 3mm. Hmm. Clearance hole for 5-40 is 1/8, this is definitely smaller than that. -- www.wescottdesign.com |
#7
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Eyetalian Threads, ca. 1950
On Thu, 06 Aug 2009 11:15:50 -0500, Tim Wescott
wrote: On Wed, 05 Aug 2009 22:24:52 -0400, Ned Simmons wrote: On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott wrote: They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. The limits on the major diameter of a 5-40 UNC-2A thread are .1242/.1191 -- within .001 of 3mm. Hmm. Clearance hole for 5-40 is 1/8, this is definitely smaller than that. dont you just hate it when you cant identify a thread. I mean it sits there bare naked before you, no pretences, and all it fits is the thread it was mated to. none of the taps and dies of supposedly the same size come within cooeee of it :-) "you know love there are just times when it makes more sense to buy a new one....." Stealth Pilot |
#8
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Eyetalian Threads, ca. 1950
On Thu, 06 Aug 2009 11:15:50 -0500, Tim Wescott
wrote: On Wed, 05 Aug 2009 22:24:52 -0400, Ned Simmons wrote: On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott wrote: They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. The limits on the major diameter of a 5-40 UNC-2A thread are .1242/.1191 -- within .001 of 3mm. Hmm. Clearance hole for 5-40 is 1/8, this is definitely smaller than that. just another thought. why not borrow the accordion and run a tap through the hole that *is* a size you can match parts for. Stealth Pilot |
#9
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Eyetalian Threads, ca. 1950
On Fri, 07 Aug 2009 00:40:27 +0000, Stealth Pilot wrote:
On Thu, 06 Aug 2009 11:15:50 -0500, Tim Wescott wrote: On Wed, 05 Aug 2009 22:24:52 -0400, Ned Simmons wrote: On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott wrote: They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. The limits on the major diameter of a 5-40 UNC-2A thread are .1242/.1191 -- within .001 of 3mm. Hmm. Clearance hole for 5-40 is 1/8, this is definitely smaller than that. just another thought. why not borrow the accordion and run a tap through the hole that *is* a size you can match parts for. Stealth Pilot That's not an issue -- the piece was broken but good; I had to make an entirely new one. The replacement uses 1/8" drill rod ('cause I had it) turned down on the ends and threaded 4-40. I just thought it was neat to find this interesting bit of historical trivia sitting in my hand, and even better to be able to use it to pull my sister's leg a bit. -- http://www.wescottdesign.com |
#10
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Eyetalian Threads, ca. 1950
On Thu, 06 Aug 2009 11:15:50 -0500, Tim Wescott wrote:
On Wed, 05 Aug 2009 22:24:52 -0400, Ned Simmons wrote: On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the shaft measured too close to 3mm to be anything else, and the OD of the threads was definitely 3mm, too. The limits on the major diameter of a 5-40 UNC-2A thread are .1242/.1191 -- within .001 of 3mm. Hmm. Clearance hole for 5-40 is 1/8, this is definitely smaller than that. There's a lot of difference between a clearance hole and a tap drill. Hope This Helps! Rich |
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