Bridgetop Extravaganza Revisited

[Erwinspiano@aol.com]

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In a message dated 12/18/2002 6:11:40 PM Pacific Standard Time, 
davidlovepianos@earthlink.net writes:

> Subj: Re: Bridgetop Extravaganza Revisited 
>  Date: 12/18/2002 6:11:40 PM Pacific Standard Time
>  From: <A HREF="mailto:davidlovepianos@earthlink.net">davidlovepianos@earthlink.net</A>
>  Reply-to: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>  To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>  Sent from the Internet 
> 
> 
> 
> Get two blocks of wood measuring exactly 7" high.  Place them on the 
> soundboard at opposite edges of whatever part of the piano you want to 
> measure.  Put a straight edge across the top of the two blocks and at a 
> point midway between the blocks, measure the distance from the bottom of 
> the straightedge to the soundboard.  Subtract that number from 7" and the 
> amount left over is the amount of crown.
>   
> David Love
>               Hi Dave
>            Not so.  In Steinway and other pianos the net result of the 
diaphramizing (panel thinning) can leave the board thickness at the edges 
where the blocks are placed at .250 thick and the middle of the board can be 
as much or more than 100. thicker. Even with a flat board this method of 
measuring crown would give a false reading as the middle of the board will 
always be thicker (higher) than the edges. If you use this method you've got 
to factor this in.
       Dale Erwin


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