Aftertouch evaluation

[Mike Spalding]

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Bob,=20

Here's a variation on the "adding punchings" method that is fast and =
effective:  Make a go-nogo gage from a strip of card stock 6" long by =
3/4" wide, with paper punchings laminated to each end to a thickness of =
"target let-off plus .005" at one end, "target let-off minus .005" at =
the other.  Cut a slot in to the punching hole in each end.  Now you can =
slip the gage in under any key, and test for let-off.  If the note lets =
off with the thin end, and does not let off with the thick end, move on. =
 Two people rarely get the same result with the same gage due to =
differences in how much pressure they apply to the key.  I first started =
using this method with gages at .050 and .060,  but now I use .030 and =
.040 (with a lighter touch).  You could argue that .010 is too wide a =
tolerance range for let-off, but you'll find that with practice you can =
"feel" finer differences with the gages set this far apart.

hope this helps

Mike Spalding RPT=20

  ----- Original Message -----=20
  From: Bob Hull=20
  To: pianotech@ptg.org=20
  Sent: Saturday, March 15, 2003 12:49 AM
  Subject: Aftertouch evaluation


  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;=20

  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?

  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?

  Bob





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