The Beauty of the Open-Faced Pinblock

[Delwin D Fandrich]

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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of
Farrell
Sent: June 10, 2007 2:23 AM
To: Pianotech List
Subject: Re: The Beauty of the Open-Faced Pinblock


What are "flared out" keys?
 
Terry Farrell 

 
In most grand pianos the centerline of the keys are perpendicular to the front
of the keybed. Then, just behind the headscale, they angle off -- flare -- to
one side or the other so they end up in line with the various capstans. Just
before the capstan line the angle back again so that the key c/l is once more
perpendicular to the front of the keyframe. 
 
In some pianos the action components (hammershanks, wippens, etc.) are not
perpendicular to their respective action rails. (Certain Chickerings come to
mind.) In these cases the keys generally do not have that second angle. 
 
In this case the owner wanted to fit a convention action design using Renner
wippens and hammershanks. For these to be mounted in the conventional manner --
i.e., with their c/l's perpendicular to the action rails -- new keys were
required. 
 
You start from the hammer strikeline and work down. The hammer strike centers
are transferred to the new action rails. Action brackets are located and fitted.
Action parts are mounted and aligned to the strings. The hammer strike centers
also become the capstan centers once an appropriate action ratio has been
developed. From here a keyset and appropriate keyframe is drawn out using the
original headscale spacing and the new capstan line and a new set of keys and
keyframe are made. In this case the drawing went to Rick Wheeler (Roseland
Piano) who made the keyset and keyframe. 
 
Del
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