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<font size=3>Hi David,<br>
My brass cauls are .002" over size for balance rails, and .005"
for front rails.<br>
Ends up right on the money.<br>
regards Roger<br><br>
<br>
At 06:25 PM 9/5/02 -0700, you wrote:<br><br>
<blockquote type=cite class=cite cite><blockquote type=cite class=cite cite>When
you leave the caul in for that long do you find you need a tighter fit,
i.e thicker bushing cloth or you end up with too much play?
<br><br>
David I.<br><br>
<br><br>
<br><br>
<br><br>
----- Original message ----------------------------------------><br>
From: Baldwin Yamaha Piano Centre
<<a href="mailto:baldwin@mta-01.sk.sympatico.ca">baldwin@mta-01.sk.sympatico.ca</a>><br>
To:
<<a href="mailto:pianotech@ptg.org">pianotech@ptg.org</a>><br>
Received: Thu, 05 Sep 2002 18:06:25 -0600<br>
Subject: RE: key bushings<br><br>
<br>
Hi Isaac, <br>
</font><font face="arial" size=2 color="#0000FF">I usually leave the
cauls a few hours, but noticed that the sizing is not as stable as I like
sometime.</font></blockquote><font size=3><br>
I have also noticed the same thing on field repairs using PVCE glue, some
times get a recall for a sluggish key.<br><br>
<blockquote type=cite class=cite cite> <br>
</font><font face="arial" size=2 color="#0000FF">But as I use most often
heated brass cauls, I guess the drying is faster (in surface
anyway)</font></blockquote><font size=3><br>
Bin thar done dat. Still do it if I'm in a hurry. Usually on
a rebuild, we do every thing that is needed to the keybed, then the
action analysis, to determine what parts to order.<br><br>
<br>
I think the big area of movement, is the reaction of the water in the
glue, on the key button. Leaving them a couple of days, we have found no
sizing is needed on the bushings, only sizing the balance rail
hole. This we size with a polished balance rail pin, chucked in a
battery operated drill, one quick pull of the trigger, and the hole is
sized to perfection. We size from the top down. No guess work
as to where the friction is coming from.<br><br>
Key bed fitting, friction control, and key fitting, is perhaps one of the
most neglected jobs in our craft.<br>
Regards Roger<br><br>
</font></blockquote><br>
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