[pianotech] SnS rim screws

[Al Guecia/Allied PianoCraft]

I don't think I said anything about crown. Of course you could never increase crown by tightening plate bolts. But if the plate bolts are loose and the plate isn't sitting down on all the plate supports, you could conceivably increase the down bearing and get a better tone and sustain if the plate was sitting firmly on the plate supports.

Al -
High Point, NC



On Jul 3, 2011, at 11:37 AM, Delwin D Fandrich wrote:

> 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
> 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 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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