Under lever gram resistance

[David Love]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment
Actually, I'm talking about a new Renner underlever system.  The gram
levels start out around 25 grams at note 1 and graduate downward.  I
take these measurements with a gram gauge with the back action on the
bench so that I can adjust the spring tension.  The question remains, at
what point in the travel is the best place to take the reading.
Ideally, I want only enough tension to get decent shut off but not so
much that there is a noticeable difference between playing the piano
with the damper pedal engaged versus not engaged.  I don't like to
notice that I am lifting the damper with my finger too much.  The next
question is what is the minimum resistance that will still produce
decent shut off. I suppose it depends on the size of the piano and the
string mass, so for arguments sake let's say your normal 6 foot
Steinway.  
 
David Love
davidlovepianos@comcast.net 
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Joe Garrett
Sent: Thursday, March 24, 2005 8:56 PM
To: pianotech
Subject: Under lever gram resistance
 
 
When setting the gram resistance of on underlevers, what is the best
point at which to take the measurement.  The higher you lift the lever,
of course, the greater the resistance, so where in the travel should the
reading be taken?
 
David,
 If you are trying to "gauge" the underlever when it is in the
piano.....NOT! Gram resistance should be taken on the flange, as with
the underlever out of the piano!
The listed, (Steinway), resistances are: Lever Flange: 3-6, (I prefer
3-5); Top Flange: 1-3
These numbers are from the OLDE Steinway Service Manual, so they pertain
to older Steinways. If the flanges you are checking are Teflon or
Graphite impregnated, then all bets are off.<G>
Best Regards
Joe Garrett, R.P.T.
Captain, Tool Police
Squares R I

---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/a9/3c/f7/41/attachment.htm

---------------------- multipart/alternative attachment--