Klarinet Archive - Posting 000702.txt from 2000/03

From: "Doug Sears" <dsears@-----.net>
Subj: [kl] thread standards (tap for post body)
Date: Thu, 23 Mar 2000 15:31:51 -0500

I have a need (the reason why is a long story) to mount some hinge posts on a
Bundy clarinet (the older, large-bore model, Bb soprano). So I called Ferree's,
and they can order the posts from Selmer, and Ferree's even has a drill with
countersink for starting the hole the post goes into. However, they don't know
about the tap for threading that hole. It looks to me like maybe an 8-24
bottoming tap, a nonstandard thread you couldn't buy at any normal tool store.
Ferree's suggested I call Selmer, and the guy there didn't know either. He said
he'd check with their repair techs and call back, but he didn't sound very
hopeful. The Erick Brand repair manual refers only to "Post Taps (RT183) No. 8
or No. 9". I think it's weird that Selmer sells posts but provides no means for
mounting them.

I'm left with a specific question, what tap is this and where do I get it, and a
lot of more general questions. The threads on the hinge screws are 1-56, right?
(also nonstandard: NF is 1-72, NC is 1-64) Do all the U.S. makers use these same
threads, or do they vary from make to make? Do the French manufacturers use
metric threads? Is there a list somewhere of these numbers (thread sizes for
post bodies, threads on hinge rods, diameter of hinge rods, etc.).

Before somebody lectures me on how hard mounting posts is, let me say that I
know that posts are attached in the undrilled state, then drilled and faced for
the specific key, and I know what it takes to do that.

--Doug
----------------------------
Doug Sears dsears@-----.org/~dsears

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