Grand touch

[David Love]

Does everyone complain?  If you were to present me with the data below
without the comment about feeling heavy I would think this looks pretty
good.  If the balance weight is actually 38 grams throughout, as suggested
by your average, then you can start looking for other problems.  What I
would do is weigh off the action complete (upweight and downweight on each
note) and see if some sections of the piano are perhaps heavier than others.
It takes about an hour.  Put the data on a spread sheet and calculate the
balance weight ((UW+DW)/2).  If it's heavier in a critical section of the
piano that might account for your reports.   Post the data or send it to me
privately.  

 

David Love
davidlovepianos at comcast.net
www.davidlovepianos.com 

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Byeway222 at aol.com
Sent: Thursday, July 13, 2006 8:15 AM
To: pianotech at ptg.org
Subject: Grand touch

 

Hello List,

It has been fascinating reading the posts on inertia, initially sparked off
by my original posting on the Petrof action I am dealing with.
Unfortunately I still don't have any further clarification as to whether
inertia is the problem.  I have been back to the piano and checked certain
areas which I had not previously been able to do.  If I could reiterate, the
situation is:-

 

A Renner action in a 12 year old Petrof concert grand which feels heavy and
tiring to pianists.

The D/W  average is 48g and U/W average 28g. Action ratio around 5.5

The regulation is not perfect but is good.

The damper pick up point is right.

The keys are not binding at the balance point or at the capstan.

The key weighting goes from 3 half inch weights in the bass through a
(curious) tenor octave of 4, then to 2 and 1.  Obviously, the positioning of
weights is crucial but without photos I can only describe the positioning as
not looking unusual in any way.

I noticed that the whippens are the Renner design to take a helper spring.
I don't see evidence though, that a set of springs or looped flanges has
been removed. They are usually just unhooked if a technician decides against
them.

 

So, given that friction does not appear to be a problem in the general feel
of the action, what would be your next steps in solving the problem.

 

ric

 

 

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