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<DIV><FONT face=Arial size=2>Hello all. This is an attempt to get =
some input
from those who (that means all of you I guess) frequently regulate grand =
actions. From the start we have a few hurdles to get over and of these =
the
principal one is that of terminology. In regulation you get a) the parts =
which
are being regulated and b) the name given to that part of the regulation =
process. Are we at one with the name "striking distance"? which should =
be about
1 7/8" Then we have "Set-off" In this part we adjust the "Set-off =
Button" until
it touches the toe of the "Jack" and causes the hammer to stop rising =
and go
into the "escapement" mode.This Set-off happens about 1/16" below the
string. Next we have the "Let-off" (I think that's sometime called =
"Drop")
when the hammer after hitting the string is allowed to subside another =
1/16".
Not to be confused with "Check" when the hammer after hitting the string =
more
forcibly rebounds into the loving grasp of its check-block. If then, =
whilst the
hammer is captivated in check you gradually release the key the hammer =
should
float upwards - not too fast. This we call "Hammer rise".. =
OK?</FONT></DIV>
<DIV><FONT face=Arial size=2>The point of all this is I went to tune =
a new
Petrof grand the other day and was amazed by how much this =
Czechoslovakian
manufacturer had deviated from what I considered the "norm". The results =
were as
follows:</FONT></DIV>
<DIV><FONT face=Arial size=2>Striking height 1 7/8" =
(OK)</FONT></DIV>
<DIV><FONT face=Arial size=2>Check 13/16" ?</FONT></DIV>
<DIV><FONT face=Arial size=2>Set-off 1/8"!!!</FONT></DIV>
<DIV><FONT face=Arial size=2>Let-off 3/8"!!!!</FONT></DIV>
<DIV><FONT face=Arial size=2>And the hammer-rise test showed that =
all the
hammers came up faster than you can say knife!</FONT></DIV>
<DIV><FONT face=Arial size=2>Here's the question therefore =
-</FONT></DIV>
<DIV><FONT face=Arial size=2>What are the correct =
settings?</FONT></DIV>
<DIV><FONT face=Arial size=2>My Steinway service manual adheres =
pretty
firmly to my first list of requirements except that the "Let-off" is =
considered
with relationship to the diameter of the string affected.</FONT></DIV>
<DIV><FONT face=Arial size=2>Oh yes - there's another aspect of =
regulation. It's
vital that the "Key depth" be correct. Steinway recommend 9.75 on models =
S - B
and 9.75mm on C & D</FONT></DIV>
<DIV><FONT face=Arial size=2>Reblitz, on the other hand, is a bit =
more "global"
in his approach giving more latitude. </FONT></DIV>
<DIV><FONT face=Arial size=2>At the end of the day does the piano =
react as a
concert pianist would expect?</FONT></DIV>
<DIV><FONT face=Arial size=2>Over to you.</FONT></DIV>
<DIV><FONT face=Arial size=2>Michael G =
(UK)</FONT></DIV></BODY></HTML>