Klarinet Archive - Posting 000322.txt from 2010/08
From: Nitai Levi <clarnibass@-----.com> Subj: Re: [kl] Klarinet Digest, Vol 6, Issue 51 Date: Mon, 23 Aug 2010 01:06:04 -0400
To correct a few points in this post:
>> I think 100% of repair technicians check pad seating by
>> inserting a slip of cigarette paper between the pad and the rim,
>> pressing the pad down lightly and sliding the paper out.=A0 =
The method, probably yes (or at least almost everyone). But not all use rol=
ling =
(cigarette) papers. Some prefer other materials that are a bit stronger and=
more =
water-resistant, but as thin.
>> Then they move the paper about 30 degrees around the pad and =
>> repeat the test, and so on all the way around.=A0 You want to get =
>> the=A0same sliding resistance everywhere.=A0
This is basically correct but over simplified. Since the keys are hinged fr=
om =
the side and come down on the tone hole at an angle, the pressure at the fr=
ont =
and back of the pad is never exactly the same except at one point, where th=
e =
force closing the key has to be identical too. So it is rarely exactly the =
same =
at the front and back. This is part of good pad installing deals with.
>> If the pressure is uneven,=A0you hold the pad cup upside down =
>> over the flame on your alcohol lamp or Bunsen burner to =
>> melt the shellac under pad and reposition the pad.
Sometimes (and some use different tools for heating). But many times, for o=
ne of =
many possible reasons, this method will not be able to achieve good=A0seali=
ng of =
the pad. A pad can have uneven=A0pressure for a different reason completely.
>> Attaching the slip of paper to a matchstick keeps your fingers away
>> from the flame and makes it easier to hold.
The papers are generally not used while heating a=A0key over the flame. Sim=
ply =
heating the key over the flame and closing it (like when playing) almost ne=
ver =
results in a key pad that is aligned correctly and seals like it should. So=
most =
of the time you need both hands while the key is heating/hot. Checking with=
a =
feeler (paper) while the glue is soft and the pad can move is mostly useles=
s =
anyway.
=
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