<HTML><FONT FACE=arial,helvetica><FONT SIZE=2 FAMILY="SANSSERIF" FACE=
="Arial" LANG="0">In a message dated 5/23/2003 7:25:04 AM Eastern Daylig=
ht Time, davner@kaosol.net writes:<BR>
<BR>
<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"></FONT><FONT COLOR="#000000"=
style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SERIF" FACE="Times=
New Roman" LANG="0">We’re not “determining proper balance=
rail height”, we’re first, bedding the keyframe – a=
nd, yes, in some pianos the glide studs barely touch, but the point is to el=
iminate any knocking of the balance rail against the keybed when you tap on =
it. If the rail “floats” at all, then the keys don=
t have a solid fulcrum. </FONT><FONT COLOR="#000000" style=
="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" =
LANG="0"><BR>
<BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2=
FAMILY="SERIF" FACE="Times New Roman" LANG="0">Depending on flatness =
of keybed, accuracy of keyframe joinery, stiffness of the slats that connect=
the three keyframe rails, and any distortion the tightening of the stack do=
wn onto the keyframe causes, the balance rail will sit at different heights =
above the keybed in different pianos. </FONT><FONT COLOR="#000000" style=
="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" =
LANG="0"><BR>
<BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2=
FAMILY="SERIF" FACE="Times New Roman" LANG="0"> Second, we’re=
setting an optimum key height, then leveling keys and setting key dip. =
; This is done with punchings and assumes the balance rail is already bedded=
. I know you know this, but....</FONT><FONT COLOR="#000000" style=
="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" =
LANG="0"><BR>
<BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SI=
ZE=2 FAMILY="SERIF" FACE="Times New Roman" LANG="0"> At the Li=
ttle Red Schoolhouse (Yamaha’s technician seminar in California), La=
Roy Edwards likened the keyframe to a bridge: with the keys (the load)=
out but the stack screwed on, the front rail and back rail are bedded first=
(the two abutments at either end of the bridge), then the balance rail stud=
s are turned down to just contact the keybed (strip of newspaper pulle=
d between stud and keybed has just a slight drag), then the keys are put bac=
k in. There’s no spec. for “height of balance rail=
, just for key height, which is determined more by the keyslip and the=
fallboard.</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #fffff=
f" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
<BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SI=
ZE=2 FAMILY="SERIF" FACE="Times New Roman" LANG="0"> &nbs=
p; The height of the balance rail =
is determined by bedding the keyframe and it ends up where it ends up. </FON=
T><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMI=
LY="SANSSERIF" FACE="Arial" LANG="0"><BR>
<BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SI=
ZE=2 FAMILY="SERIF" FACE="Times New Roman" LANG="0"> &nbs=
p; --David=
Nereson, RPT </FONT><FONT =
COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SAN=
SSERIF" FACE="Arial" LANG="0"><BR>
<BR>
</BLOCKQUOTE><BR>
<BR>
As I understand it, LaRoy's reasoning for bedding the frame without the keys=
is that when there is no load (key weight) on the balance rail it will find=
it's own "proper height" and then serve as an ideal and solid "foundation" =
for key height/level.<BR>
<BR>
will</FONT></HTML>