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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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help ID bicycle spoke threads?
Woops, I meant 22 or 23 threads per 10mm, sorry ..
"I've got this silly idea for a design using bicycle spokes. I can't measure this thread and I don't know metric threads very well at all. I do have a real cheapo shadowgraph style optical comparator, and was able to get what I believe is a usable picture. The scale shown is millimeters, and it appears there are either 20 or 21 threads per 10mm, don't know which to count as #1. The spoke threads mic at .078" which is real close to 2mm. Not that I have a die this size, but can anyone ID this thread and explain how to do it?" See the image: http://www.tinyisland.com/images/temp/spokeThreads.jpg Grant Erwin Kirkland, Washington |
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On Wed, 21 Sep 2005 16:05:30 -0700, Grant Erwin
wrote: Woops, I meant 22 or 23 threads per 10mm, sorry .. "I've got this silly idea for a design using bicycle spokes. I can't measure this thread and I don't know metric threads very well at all. I do have a real cheapo shadowgraph style optical comparator, and was able to get what I believe is a usable picture. The scale shown is millimeters, and it appears there are either 20 or 21 threads per 10mm, don't know which to count as #1. The spoke threads mic at .078" which is real close to 2mm. Not that I have a die this size, but can anyone ID this thread and explain how to do it?" See the image: http://www.tinyisland.com/images/temp/spokeThreads.jpg Grant Erwin Kirkland, Washington I would guess 56 tpi. Your shadowgraph picture supports that, and it is a standard spoke thread. http://www.philwood.com/Price%20List...ingMachine.pdf Note that spoke threads are rolled rather than cut; the threaded diameter is larger than the unthreaded body diameter. |
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