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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100207/ebe82b5c/attachment.htm>
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