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<DIV><FONT face=Arial size=2>Dear list,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>What is CA glue?</FONT></DIV>
<DIV><FONT face=Arial size=2>Are there different qualitys or brands =
that are
better to use?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Pierre Gevaert.</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=Billbrpt@AOL.COM =
href="mailto:Billbrpt@AOL.COM">Billbrpt@AOL.COM</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, June 15, 2002 =
4:19
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Doping pins.</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT size=2>In a =
message dated
6/15/02 8:47:25 AM Central Daylight Time, <A
href="mailto:ptuner@optonline.net">ptuner@optonline.net</A> (Matt =
Wynne)
writes: <BR><BR><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px"
TYPE="CITE">> > Matt, List: <BR>> > <BR>> > I may =
have
missed a post or two on this thread, but is there an advantage =
<BR>> >
to turning a grand upside down? I've used CA glue for loose =
t-pins
from <BR>> > the topside only - and with pretty good results =
so far.
<BR>> > <BR>> > Jerry Gravina <BR><BR>Jerry: <BR><BR>I =
like to
flip grands because the CA is applied directly to the pins and
<BR>immediately surrounding area. I haven't commissioned a =
study but I
imagine <BR>that if you apply from the top, some glue gets absorbed =
by the
tuning pin <BR>bushing. If I have room, it usually takes me =
under 5
minutes to flip a <BR>grand alone</BLOCKQUOTE>.</FONT><FONT lang=0 =
face=Arial
color=#000000 size=3 FAMILY="SANSSERIF"> <BR><BR>Although I =
rarely get
involved with something like this, there is a time and place for =
everything.
There is a friend of many years who has a Lyon & Healy grand =
that
has been sitting around in unplayable condition for about 10 years. =
It
really needs rebuilding but there is no way he could afford that. =
The
soundboard and bridges are in flawless shape. <BR><BR>Upon inspection, =
the
pinblock looked good too with no visible delamination but many of the =
tuning
pins were uncontrollably loose. I decided that this was a good =
candidate
for CA glue pinblock doping. Last weekend we did the doping job =
and
today I will go finish the project. <BR><BR>I look at it from a =
theoretical
point of view: couldn't I surround more of the pin more =
effectively by
first turning the piano over and doping from the backside, then from =
the top?
Not only did this work very well but upon doping from the =
backside of
the pinblock, there was some seepage through to the edge of the =
pinblock
between the bottom two laminations. This told me that even =
though the
block was not *visibly* delaminating, it was in fact very weak, enough =
so that
the glue seeped through. <BR><BR>The whole idea of using CA glue is =
that this
substance will fuse together any structurally weak parts of the block. =
The other kinds of dope which are merely intended to swell the =
wood
cannot provide any structural strength the way CA glue does. Upon =
doing the
first rough tuning, each pin was stuck hard and took some real muscle =
to move
it. But afterwards, the feel was amazingly normal and smooth =
(not jumpy
as might be expected) with very high torque, about what you'd expect =
from a
new pinblock. <BR><BR>The hammers were worn enough to need replacing =
but the
customer not having enough to pay for that, I just decided to give =
them a good
filing. The let off was about 1/2" but after a good knuckle =
bolstering
job, it brought the let-off right up to where it should be with a few =
hammers
even blocking slightly. It lifted all the shanks off the rest =
rail too.
Today, I'll go over the regulation but I don't expect to have to do a =
lot.
I'll give it two more tuning passes (a total of 4). We had =
to
overhaul the pedal box but aside from that, just a few basics like =
this will
bring the old grand of fairly good design back to life for a few =
hundred
dollars. <BR><BR>Another younger tech who is still learning the trade =
is
participating and the customer himself did the doping. We had =
fans
blowing full force with all the windows open to evacuate the fumes =
which were
pretty intense at times. Like the recent thread on Spinet =
Grommets,
involving the customer of modest means and maybe another tech who is =
learning
the trade can be a way of lowering the costs to the customer and =
having that
person be really grateful. <BR><BR>Everyone enjoyed the session, we =
broke for
lunch and another couple of iced tea breaks which we'll do again today =
and
have a very well spent day. Tonight, undoubtedly, there will be =
music
flowing from that house all evening long. <BR><BR></FONT><FONT =
lang=0
face=Arial color=#000000 size=2 FAMILY="SANSSERIF">Bill =
Bremmer RPT
<BR>Madison, Wisconsin <BR><A =
href="http://www.billbremmer.com/">Click here:
-=w w w . b i l l b r e m m e r . c o m =-</A>
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