Klarinet Archive - Posting 000134.txt from 2011/06

From: hns692@-----.com
Subj: Re: [kl] Keeping screws in place
Date: Wed, 15 Jun 2011 16:06:58 -0400

The tightening you describe is called "thumb tightening." It's probably
familiar to anyone who's used a micrometer.

Lee Ann

In a message dated 6/15/2011 2:52:04 P.M. Central Daylight Time,
keith.bowen@-----.com writes:

Rachel

The screws we are talking about have cap heads, which fit into the
countersunk hole on the post. You cannot keep them screwing for ever as the
cap tightens up against the bottom of the countersink. The V hole in the
rod
should therefore be reamed so that the screw is free to rotate but not
loose. If the rod is too tight, you should ream a little more out of the
rod. If it is too slack, ream a little more out of the countersink. There
are of course special tools for these, sold by Ferees and others. Your
screw
is of this type if, when you screw it into the post with no key present, it
stops at some point and will not go any further. As you say, the mechanism
is built to work around that.

Or should be. But some modern Buffet E13s, and probably other instruments -
have a different system. They have a pivot screw that is threaded all the
way along, essentially a grub screw. If you tighten it, yes it will jam.
This type does need something to lock it. I don't know what Buffet use at
the factory, but on the example I saw, there was a thin thread wrapped
around the screw thread which made it stiff to turn. Loctite (the right
sort) would be better. (I had reamed the pivot several times before I
discovered this!!). This is a cheaper construction which can work
reasonably
well but is less reliable.

You should not tighten them to the point where you cannot get them out,
just
to the point at which they cannot get out by themselves. They will only do
this if the pivot hole is not reamed deeply enough or is reamed at a skew.

A good tech will of course do all this on an overhaul. Or you can get a
pair
of reamers. It's not difficult, just needs patience.

Keith

-----Original Message-----
From: Rachel Roessel [mailto:gsurosey@-----.com]
Sent: 15 June 2011 19:33
To: The Klarinet Mailing List
Subject: Re: [kl] Keeping screws in place

Forgive me if this is a dumb question, but won't screwing the screw really
tight
restrict movement of the mechanism? Or is it built to work around that? I
make
sure my screws are snug, but I don't tighten them to the point where I
don't

think I can get them out again (at least on the pivot screws - the rods
seem
to
take care of themselves).

Rachel

________________________________
Loc-Tite and nail polish will keep the screw from backing out, but they're
still first aid and don't address the underlying problem, which is that the
screw is binding inside the moving part of the assembly - the hollow rod in
the case of your rings. You should be able to torque a screw quite hard so
it doesn't work loose.
_______________________________________________
Klarinet mailing list
Klarinet@-----.com
To do darn near anything to your subscription, go to:
http://klarinet-list.serve-music.com

_______________________________________________
Klarinet mailing list
Klarinet@-----.com
To do darn near anything to your subscription, go to:
http://klarinet-list.serve-music.com

_______________________________________________
Klarinet mailing list
Klarinet@-----.com
To do darn near anything to your subscription, go to:
http://klarinet-list.serve-music.com