[pianotech] regulating backchecks?

[David Love]

I should add that all this also assumes that the back check angle is
properly set.  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Love
Sent: Wednesday, July 29, 2009 8:16 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] regulating backchecks?

 

If the bedded versus not bedded regulation yields uneven results then set
some samples (end of each section) with the action bedded and then set the
rest to those on the bench or your lap or however you choose.  Check again
and make adjustments.  Also remember that speed of rebound effects the
checking distance so allowing them to lazily fall back to the check on the
bench will produce a different result than a hammer rebounding off the
string.  Use your fingers gently covering the flange side of the shank when
testing out of the piano use light pressure to get the hammers to reset at a
reasonable descending speed (hard to describe exactly).  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of jim ialeggio
Sent: Wednesday, July 29, 2009 6:57 AM
To: pianotech at ptg.org
Subject: [pianotech] regulating backchecks?

 

My Dear Action Nerds,

As I work to refine my grand regulation skills and procedures, I've run into
a catch 22 regarding grand backcheck regulation which has me scratching my
head.

Here's the problem:

In order to accurately regulate the backcheck, you need to be able produce
the full dip that will occur when the action is bedded in the action cavity.


However, in order to actually adjust the backcheck, especially if the
adjustment is an angle adjustment  the action needs to be pulled from its
bedded condition so yo can get at the backchecks to do the adjustment. Now,
as the action is no longer bedded, you have  thus lost ability to reproduce
the bedded dip and full excusion of the key/backcheck, and you no longer
know what adjustment you need to make.

Similarly, I can regulate a very nice consistent backcheck line on the
bench, with bedding approximately reproduced, but not quite...then the
action goes into the piano and bingo I wasted my time.

What am I missing here?

Jim I 



-- 
grandpianosolutions.com (under construction)
Shirley, MA  (978) 425-9026

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