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<DIV><FONT face=Arial size=2>I agree with Richard in that it is a =
matter of
feel. The jack must travel enough to escape the knuckle and have a feel =
of
completeness to the stroke with no excess motion. </FONT></DIV>
<DIV><FONT face=Arial size=2>0.50 to 0.60 from the point of letoff =
is about
right. Set a sample note and check to see that the jack is ending up =
where it is
supposed to. The problem is to make all the notes the same. Blow =
distance
changes aftertouch so make sure the blow distance is set on every =
string. Then I
take a piece of hard plastic, 0.50 thick, the size of a keytop =
head, with a
slot the width of a key pin notched in one end and slide that under =
the
felt punching. What ever you use, a penny maybe, it has to be thin =
enough to
have let off occur, then from your sample note, determine how far past =
let off
the key is now traveling and adjust the key dip to match the sample. A =
piano
with 0.60 aftertouch, the hammer will drop and rise ever so slightly as =
the
punchings firm up. No rise, remove some punchings, etc. </FONT></DIV>
<DIV><FONT face=Arial size=2>The same plastic, in the shape of a =
keytop tail,
slides in-between the white key pins to do the sharps in the same =
manner. This
is a method that produces a very even aftertouch, sharps =
included.</FONT></DIV>
<DIV><FONT face=Arial size=2>Note to Bob Davis. Thanks for this =
method. It was a
piece to the jigsaw puzzle that sat there for awhile before it fit into =
the
picture. Knowing that you consider some of the methods you have =
developed to be
proprietary, I apologize if I crossed that boundary, but hey, these guys =
need
all the help they can get. <GRIN> I gave enough hints, they might =
be able
to figure out what keytop material is already .050. As you so =
eloquently
posted, sharing information and techniques improves the overall quality =
of piano
work around the world and comes back to us in form of respect for our =
profession
and earning power. I must compliment you on your class at the CA =
convention,
well put together and "the most applause at the end of the class"
award.</FONT></DIV>
<DIV><FONT face=Arial size=2>Keith Roberts</FONT></DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=hullfam5@yahoo.com href="mailto:hullfam5@yahoo.com">Bob =
Hull</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> Friday, March 14, 2003 =
10:49
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Aftertouch =
evaluation</DIV>
<DIV><BR></DIV>
<P>I am wondering about the value of different methods of evaluating
aftertouch on a grand. I know one method is to add punchings on top of =
those
on the front rail pin until let-off can't take place; </P>
<P>Another method I've heard of and used is to look at the final =
position of
the jack in relationship to the knuckle and jack cushion after drop - =
but this
can't be done with the action in the piano; The next method =
(which I
don't think I've read about anywhere) is my question to the =
list: Can
you accurately evaluate aftertouch by traveling the key/hammer =
through
drop and then moving the jack tender downward to see how far the jack =
travels
before being stopped by the jack cushion?</P>
<P>Also, if you are using the addition of punchings on the front rail =
pin
until let-off fails, what are some good parameters to stay within for =
"good"
aftertouch, i.e. .050 - .060 ? I know the Steinway manual says =
that a
good amount is about the thickness of a new penny. How far can =
we stray
from that measurement and still be alright?</P>
<P>Bob</P>
<P><BR>
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