[pianotech] WNG Backchecks

[Gene Nelson]

Thanks Will,
I am trying to make a hammer set work that I have had for several years. Did not realize they would be going onto this piano when I bought them nor did I know about WNG parts at the time.
Whenever I have ordered Isaacs in the past, they are always uncut/undrilled etc. To order them precut/predrilled etc would only shorten what I thought was his standard grand hammer set. So I am a bit suprised that I have run into this.
Feel like I asked a dumb question.
Gene
  ----- Original Message ----- 
  From: Will Truitt 
  To: pianotech at ptg.org 
  Sent: Saturday, February 14, 2009 3:38 PM
  Subject: Re: [pianotech] WNG Backchecks


  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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