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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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Mystery Thread
I have a thread here I can't find a standard size for, it is off of my
bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken |
#2
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Ken Vale wrote: I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken hmmmm.... M10 X 1.25 pep boys should have these for about .99 or so. sjm1 |
#3
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Ken Vale wrote:
I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken And no it doesn't seem to be metric either (9.78mm) Ken |
#4
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Ken Vale wrote:
Ken Vale wrote: I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken And no it doesn't seem to be metric either (9.78mm) Ken Never mind I was looking on the wrong page of the Machinery's Handbook. Ken |
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On Tue, 07 Jun 2005 19:36:28 -0400, Ken Vale wrote:
I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken Might get a better thread measurement by measuring the distance of 10 threads and dividing by ten for metric thread pitch. ....much easier than measuring two adjacent threads. -- Skuke Reverse the domain name to send email |
#7
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Tim Wescott wrote:
That sounds right. Bicycles have been all-metric for _years_. But 10*1,25 is not as common as 10*1 (haven't checked my bike). Better recheck! Nick -- Motormodelle / Engine Models http://www.motor-manufaktur.de |
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"Tim Wescott" wrote in message ... That sounds right. Bicycles have been all-metric for _years_. Not yet they aren't. Bicycles are a fine example of "standards, it's a good thing there are so many of them". Campagnolo axles - 10mm x 26 tpi. |
#9
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skuke wrote:
On Tue, 07 Jun 2005 19:36:28 -0400, Ken Vale wrote: I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken Might get a better thread measurement by measuring the distance of 10 threads and dividing by ten for metric thread pitch. ....much easier than measuring two adjacent threads. Maybe but there is not enough length for me to measure 10 threads, I did however measure a 1/4 inch and count the threads (just over 5). Ken |
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On Tue, 07 Jun 2005 20:52:09 -0400, Ken Vale
wrote: skuke wrote: On Tue, 07 Jun 2005 19:36:28 -0400, Ken Vale wrote: I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken Might get a better thread measurement by measuring the distance of 10 threads and dividing by ten for metric thread pitch. ....much easier than measuring two adjacent threads. Maybe but there is not enough length for me to measure 10 threads, I did however measure a 1/4 inch and count the threads (just over 5). Ken Bicycles are about as non-standard a product as you could immagine - with bolts sized metric, with threads per inch spec - and half mm sizing - like 9.5mmX26 axles etc. The crank nut is not a standard nut either - either a serrated flanged nut or a "race nut" 0 with a captive free-rotating washer are common. Just get a replacement nut - they are cheap(relatively) and readily available from your local bike shop - who WILL know which one fits a Norco. |
#11
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"Ken Vale" wrote in message ... I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken 10mm-1 is fairly common with bicycle parts. N333(TOOL CALL N334G0G17G40G80G90M5M9 N335T5M6((TAP 10MM -1 N336X0Y0E1S900M3 N337Z3.D5H5M8 N338(TAPPING N339G0G80Z1. N340G84R+0.25Z-0.67F35.46S900 N341G80R+0.25 Verify the pitch yourself, Im too lazy..thinking it was appx .0394in/turn. -- SVL |
#12
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PrecisionMachinisT wrote in message ... "Ken Vale" wrote in message ... I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken I'd ask the question on rec.bicycles.tech(or something like that), they're a pretty savvy group that will probably take you in the right direction. Pat |
#13
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"patrick mitchel" wrote in message ... PrecisionMachinisT wrote in message ... "Ken Vale" wrote in message ... I have a thread here I can't find a standard size for, it is off of my bicycle (an older non-high performance Norco mountain bike, it was made in Taiwan). The nut holding the crankshaft on is stripped, the threaded rod is 0.385 inches (measured with a digital caliper) and looks to be about 20 TPI (sorry don't have a thread gauge at home). A 3/8 fine nut will not fit on (which is what my boss thought it would be looking at the stripped nut, though the stripped nut did fit on a 3/8 fine bolt). Anyone have an idea on the thread size I need so I can buy or make a new nut? Ken I'd ask the question on rec.bicycles.tech(or something like that), they're a pretty savvy group that will probably take you in the right direction. Pat I agree. Still, it wasn't me that was asking the question--so I suggest maybe you should work on it a bit--a direct reply to any of my posts is usually like a big red flag for me.... Cheers, -- SVL |
#14
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jtaylor wrote: "Tim Wescott" wrote in message ... That sounds right. Bicycles have been all-metric for _years_. Not yet they aren't. Bicycles are a fine example of "standards, it's a good thing there are so many of them". Campagnolo axles - 10mm x 26 tpi. Hey another Campy fan! Bravo! ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#15
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