[pianotech] Hammer strike line. Was-----Yamaha Hammer Suggestion

[David Andersen]

"I don’t know the answer, but I have also wondered it if it is related  
to the vagaries of the plate casting, particulary the string height.   
The string height is not always even or  tapers evenly along its  
length within a section."

I think it has a LOT to do with string height/plate irregularities...
DA



On Feb 7, 2010, at 5:54 PM, William Truitt wrote:

> Whether or not it is a  CC board or R, C, & S or whatever, killer  
> octave or no, WHY does the strike point deviation improve the tone?
>
> I don’t know the answer, but I have also wondered it if it is  
> related to the vagaries of the plate casting, particulary the string  
> height.  The string height is not always even or  tapers evenly  
> along its length within a section.  The inconsistencies can be  
> measured, and are often visible to the naked eye.  Also, there is no  
> guarantee that the v bar consistently ends up in the same place fore  
> and aft from plate to plate after being shaped, and in relation to  
> other sections within a plate.  And the profile itself can vary  
> widely in shape.
>
> Will
>
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]  
> On Behalf Of PAULREVENKOJONES at aol.com
> Sent: Sunday, February 07, 2010 8:27 PM
> To: pianotech at ptg.org
> Subject: Re: [pianotech] Hammer strike line. Was-----Yamaha Hammer  
> Suggestion
>
> That's the interesting question. And that was my point. Thanks, David.
>
> Paul
>
> In a message dated 2/7/2010 7:18:23 P.M. Central Standard Time, davidlovepianos at comcast.net 
>  writes:
> I've found the same thing.  Strike line deviation being necessary on
> original boards but when I replace the board on the same piano with  
> a RC&S
> board the strike line seems to straighten out, or the curve becomes
> unnecessary.  What's that about?
>
> David Love
> www.davidlovepianos.com
>
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]  
> On Behalf
> Of Ron Nossaman
> Sent: Sunday, February 07, 2010 3:31 PM
> To: pianotech at ptg.org
> Subject: Re: [pianotech] Hammer strike line. Was-----Yamaha Hammer
> Suggestion
>
> William Truitt wrote:
> > I too have staggered the strike line on Steinway grands and other  
> pianos
> > to find the sweet spot and get the best tone.  So let's ask the  
> question
> > of the why of that - what is going on in the plate and string  
> interface
> > in relation to the action that requires something other than a  
> straight
> > line to achieve the best tone?
>
>
> Look at where the farthest deviation from a straight line is.
> Gee, that looks like the most universally problematic part of
> Steinway, and other largely panel supported crown, scales. How
> can there possibly be tonal problems in the killer octave?
> Must be the plate casting.
>
> As I periodically repeat, I find this phenomenon to not be
> obvious in low compression and adequately supported RC&S
> systems. I still check now and then, but find the difference,
> if I can detect any at all, to not be worth the trouble to
> deviate from the straight line on a new RC&S board. On an
> original board, it's likely obvious enough to be worth the
> trouble.
>
> I think it's primarily the soundboard.
> Ron N
>

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