On 23 Jun 2003 00:23:02 -0700, Chalo wrote:
> skuke <
[email protected]> wrote:
>
>> On Sat, 21 Jun 2003 08:09:40 -0500, A Muzi wrote:
>>
>>> Nipples are headed from brass , milled for the wrench flats*, threaded with our industry's odd
>>> 2x56tpi**
>>
>> 2-56 taps are not odd, unusual, rare or otherwise different. I've been cutting (or forming) that
>> thread for 20 years. It may be strange in the bike industry only because most things are metric
>> threaded.
>
> Well if you had been a cycle-centric machinist during your tenure, you might have noticed that
> spokes are not threaded #2-56, but rather 2mm-56tpi, which *is* a strange ******* thread; Mr. Muzi
> is right about that. #2-56 thread is close, in that a #2-56 nut will spin on to a 14ga spoke
> thread, but the fit is too loose and a nipple would be prone to thread failure if it were tapped
> with that thread.
>
> True to form, 15ga spokes are threaded 1.8mm-56tpi.
>
> It's analogous to some of the threads of the Italian standard which mix a metric diameter with an
> inch pitch, e.g. 10mm-26tpi axles in Campy hubs. Italian BBs are what, 36mm-24tpi? It defies
> understanding unless you assume that Italian industry were getting their thread cutting equipment
> from Old Blighty.
>
> Chalo Colina
Thanks! I learned something new today.
Yes, I misread/understood Mr. Muzi's statement to be #2-56tpi and not 2mm-56tpi.
How on Earth did the bike industry wind up with that bastardization of a thread "standard"??
BTW, I do consider myself to be a cycling-centric machinist. I've made many custom component for
myself and others. I have not had the need (obviously) to thread either nipples or spokes. I try not
to make things that are easily (and more cheaply) purchased at the LBS.
--
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