Topic: Does anyone know the spoke thread diameter and pitch? (CB750)

[754]

anybody got a BA thread pitch gauge ?  they're spendy on ebay

You dont need a BA guage to determine pitch, any pitch guage will work, it wil just show air if thread form is wrong.. BA is likely 55 degree angle, I will check.

[steve swan]

754, thanks for your comments.  i believe you're correct on the 55' angle for BA

[754]

Its 47.5 degrees on the cutting tool, but rounded roots and crests..not sure that is good for rolling..
 You would see the rounded root under magnification.

[kmb69]

Subscribed.

Sure interested in what you guys find out.

[steve swan]

just so i am clear.  is it reasonable to say finding taps and dies for these rolled threads will be difficult, if nonexistant....? 

assuming the threads are British, perhaps http://www.tracytools.com/ will be a source.  Tracey carries obsolete and bastard size taps and dies typically found on 1900 to 1930 era motorcycles. 

i know gun makers also contend with bastard size thread tooling.

i realize in the area of spokes, we are not talking about bastard sizes, but probably industry standard spoke specs.

[steve swan]

Thanks for your post steve swan.I like that new Hozan Ebay sold spoke threading tool;sure would be nice if it could be fitted w/ larger 'rolling/cutting' heads to work for motorcycle spokes if any of us were to find blank spokes 8 gauge or so.
I imagine the Hozan Co. in Japan might make a larger machine.

didn't look closely, but didn't find motorcycle anything under Hozan, but did find this lnk 

http://www.akibo.co.jp/export/product/bicycleparts/hozan.html

[754]

You can get taps for almost anything, plus, if you are just cleaning the threads, you can make a tap out of semihard material, it would still work.
 What I forgot to mention before rolling. And formng taps are chipless, they dont cut..they work by displacing the metal..  Way better and faster in a high production situation...

[754]

The Hozan I have is the C700, you just change the rolling head for different sizes/ diameters of spoke. I would be trying to make my own if I could find a source for blank spokes.