[pianotech] SnS rim screws

[Delwin D Fandrich]

Then I'd sure like to see better explanations of just what mechanism might
have been at work to cause an immediate and measurable increase in
soundboard crown as a result of tightening plate screws/bolts. There is
nothing one could do to the rim-or any other part of the skeleton-of an
assembled piano that could conceivably cause a resultant increase in
soundboard crown. Tightening plate screws and/or bolts simply will not do
it-no matter how loose they might have been or how tight they have now
become.

 

ddf

 

Delwin D Fandrich

Piano Design & Fabrication

6939 Foothill Court SW, Olympia, Washington 98512 USA

Phone  360.515.0119 - Cell  360.388.6525

 <mailto:del at fandrichpiano.com> del at fandrichpiano.com -
<mailto:ddfandrich at gmail.com> ddfandrich at gmail.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Al Guecia/Allied PianoCraft
Sent: Sunday, July 03, 2011 7:27 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] SnS rim screws

 

Joe Gross wrote: 

 

Cut to the chase: We tightened the bolts  with a socket. Crown is back in
the mid section where it was flat. Sustain 8 seconds.

 

 

Del, I don't think it was relative humidity change in this case. As I read
it, it was an immediate change.

 

Al -

High Point, NC

 

 

 

On Jul 3, 2011, at 9:51 AM, Delwin D Fandrich wrote:





It's more likely the relative humidity around the piano has changed thus
changing the moisture content in the board thus changing the amount of
crown. Happens all the time when humidity levels changes.

 

ddf

 

Delwin D Fandrich

Piano Design & Fabrication

6939 Foothill Court SW, Olympia, Washington 98512 USA

Phone  360.515.0119 - Cell  360.388.6525

del at fandrichpiano.com - ddfandrich at gmail.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Al Guecia/Allied PianoCraft
Sent: Sunday, July 03, 2011 5:33 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] SnS rim screws

 

Joe, it could then be possible that the plate was up off the supports and
when you tighten the plate bolts you got the plate down onto the supports
and thus the improved tone and down bearing.

 

Al -

High Point, NC

 

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