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

[David Love]

Since the rib formation is based on a circle it doesn't much matter how you
cut it.  I have altered the rib tapering before to move the center of the
full height of the rib more under the bridge in the upper end where the
bridge moves toward the belly rail.  But I've also done it without doing
that and I don't really notice any difference.  

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES at aol.com
Sent: Sunday, February 07, 2010 7:51 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Hammer strike line. Was-----Yamaha Hammer
Suggestion

 

 

 

In a message dated 2/7/2010 9:42:00 P.M. Central Standard Time,
davidlovepianos at comcast.net writes:

In my experience the crown is not necessarily shifted forward since the rib
is formed in a uniform radius.  There is certainly more control of the
stiffness in the killer octave of an RC&S board since it is determined by
the rib design and not by the unpredictability of compression crowning.  

That I know, but would have expected that there might be some rib radius
shift as part of the design. 

 

Thanks,

 

P

 

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES at aol.com
Sent: Sunday, February 07, 2010 7:21 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Hammer strike line. Was-----Yamaha Hammer
Suggestion

 

David:

 

In your experience, is the crown set further forward in the killer octave in
RC&S boards? Is there a greater stiffness that comes with that construction
in the killer octave? Random questions...

 

P

 

In a message dated 2/7/2010 9:18:48 P.M. Central Standard Time,
davidlovepianos at comcast.net writes:

I agree it seems about the soundboard but what specifically about the change
in design accounts for that difference.  The answer is not jumping out at
me.

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 6:16 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Hammer strike line. Was-----Yamaha Hammer
Suggestion

David Love wrote:
> 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?  

It's about the soundboard, I'd say.
Ron N

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