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

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.