[pianotech] Inverted soundboard

[Ryan Sowers]

Maybe another case of an enthusiastic technician making sure all those
strings are seated on the hitch pins??

On Mon, Dec 6, 2010 at 9:47 PM, Delwin D Fandrich <del at fandrichpiano.com>wrote:

> Personally I’d be a little curious about just how all that reverse crown
> got in there. If the factory boys set the strings anywhere remotely close to
> the right place on those vertical hitches there shouldn’t have been enough
> string bearing to force the board that far back. Flat, maybe, but not all
> the way back so the ribs are resting on the backposts. Makes me wonder just
> how there ended up being enough force against the bridges to cause this to
> happen in—what?—just 20 years.
>
>
>
> The fairly substantial ribs in these things should have been crowned to
> something like a 72’ foot radius—don’t ask—and I don’t care how wet or dry
> the piano might have gotten in those 20 years I don’t see how climate alone
> could have created all this damage. If the piano was in a very humid climate
> the soundboard should have done what soundboards do; developed a bunch of
> compression ridges and crushed. If it got all dry the panel should have just
> split wide open. Seems to me that to force that kind of inversion into the
> system there would have to have been a whole lot of excessive string bearing
> pressing against the bridges. Where did it come from? And is it still there?
>
>
>
> ddf
>
>
>
> Delwin D Fandrich
>
> Piano Design & Fabrication
>
> 620 South Tower Avenue
>
> Centralia, Washington 98531 USA
>
> del at fandrichpiano.com
>
> ddfandrich at gmail.com
> Phone  360.736.7563
>
>
>
> *From:* pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] *On
> Behalf Of *Dale Erwin
> *Sent:* Monday, December 06, 2010 8:53 PM
> *To:* pianotech at ptg.org
> *Subject:* Re: [pianotech] Inverted soundboard
>
>
>
> Bummer Don
>   As a last resort.  See if you can create a space between the post and the
> soundboard so there is no impingement.  Who knows it may sound quite good.
> Perhaps you are unaware that some makers Have & are producing reverse crown
> boards and they sound quite good.  At this point you and the client have
> nothing to loose.
>   Good Luck
>
>
>
>
>
> *Dale S. Erwin
> **www.Erwinspiano.com
> Custom restoration
> Ronsen Piano hammers
> Join the Weickert felt Revolution
> 209-577-8397
> 209-985-0990**
>
> *
>
>
>
>
>
> -----Original Message-----
> From: Don Hubbs <donhubbs at mwt.net>
> To: pianotech at ptg.org
> Sent: Mon, Dec 6, 2010 7:02 pm
> Subject: [pianotech] Inverted soundboard
>
> I have a 1990 Baldwin 6000 (52” upright) with an inverted soundboard. The
> piano was evidently in a very damp environment at one time, since there were
> several loose glue joints, including the bass bridge to apron and some
> plywood delaminating in the bottom board . The inversion is severe enough
> that the ribs near the center of the board are pushing against a back post.
> The tone is even but weak. Is there any way to flip the soundboard back to
> its original position without destroying it? Can I just remove some wood
> from the back post to give the rib clearance and expect that to enlarge the
> tone? Bearing can be adjusted because of the Accu-hitch pins. Thanks for any
> suggestions or prior experiences.
>
>
>
> Don Hubbs
>



-- 
Ryan Sowers, RPT
Puget Sound Chapter
Olympia, WA
www.pianova.net
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