[pianotech] WNG Backchecks

[Will Truitt]

Hi Gene:

 

To avoid the kind of issues that you are having, it has been my practice to
measure the string height and hammer center pin height and calculate the
boring distance.  I also record the hammer tail lengths at the ends of each
section (they will vary in length in some pianos).  Most of the time I will
use the lengths that came with the original hammers.  Then I order  a set of
hammers where the overall hammer length is at least several mm greater than
anything I would likely need.  After I have bored the set, if the tail
lengths vary, I mark the tail length from the center of the bore at the ends
of each section, and then strike a line across the massed hammers.  I have a
little jig I use on my bandsaw to then cut the tails to length. 

 

Having custom bored the hammers to the piano and established the preferred
tail length, I hang the hammers.  I regulate the let off for sample hammers
at each section end.  At let off, I measure the distance from the bottom of
the tail to the top of the key to establish what the back  check height
needs to be.  I will then press the new back checks into the hole to the
desired height.  

 

If I am not mistaken, I believe the WNG back checks come in two wire
lengths.  If you order hammers that are long enough, you should not have the
issues you encountered here.

 

Will Truitt

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Gene Nelson
Sent: Saturday, February 14, 2009 4:35 PM
To: pianotech at ptg.org
Subject: [pianotech] WNG Backchecks

 

Hello list,

While trying to get ready for installation of my first WNG Backcheck set I
discover that my hammer set (purchased uncut, unbored & uncoved) is not long
enough (especially in the upper bass)  to get the 25.4mm beyond bore
distance. 

Anyone else get a chance to work with these yet? Have similar issues?

Gene

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