[CAUT] Down Weight Too High With New Hammers

[bdshull]

Sent from my HTC Tilt™ 2, a Windows® phone from AT&T

-----Original Message-----
From: Israel Stein <custos3 at comcast.net>
Sent: Thursday, August 26, 2010 11:59 PM
To: caut at ptg.org
Subject: [CAUT] Down Weight Too High With New Hammers


> Wed, 25 Aug 2010 13:56:40 -0400 "Paul Milesi, RPT" <paul at pmpiano.com> wrote:
>
> Thanks, Israel.  Interesting info.
>
> BTW, this piano I?m working on is D #420394 (1971).  The D you said you have
> data on (#418477) is very close in vintage, and the data therefore might
> prove interesting when compared.
>   
Well, Paul, I am afraid that the comparison isn't going to be quite that 
close. After looking at my notes more carefully, it turned out that this 
steinway D is really serial #376678 - 1962. So I don't know how it 
compares to your 1971. Also, apparently we did get funding for all new 
action parts on that piano (it being a "D") so the data is on all new 
parts - we were trying to select the best wippen/shank combination 
(using the Renner parts kit). So here is the data, for what it's worth, 
on Key # 27.

With straight heel wippen:

Knuckle             DW         UW           Friction        Approximate 
keydip
position                                                                   
at 1 7/8" strike distance

16.5 mm            51 g.       24 g.           13.5 g.         .390"
17 mm               50 g.       22 g.            14  g.          .390"
16 mm   (didn't bother - can't regulate properly - jack jams into rep 
lever before sufficient aftertouch is achieved)

With angled heel wippen:

Knuckle             DW         UW           Friction        Approximate 
keydip
position                                                                   
at 1 7/8" strike distance

16.5 mm              55 g.       31 g.           12 g.             .420"
17 mm                 50 g.       22 g.            14 g.            .420"
16 mm                 59 g.      26  g.            16.5 g.         
.420"  (jack jamming into rep lever...)

The Steinway M data isn't very useful - we were trying out various used 
wippens from donated sets, guessing at their origin...  

Israel Stein