Setting downbearing

[Erwinspiano@aol.com]

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In a message dated 12/20/2002 8:05:48 AM Pacific Standard Time, 
davidlovepianos@earthlink.net writes:

> Subj: Setting downbearing 
>  Date: 12/20/2002 8:05:48 AM 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 
> 
> 
> 
> I've been reviewing some articles on setting downbearing and there seem to 
> be a few different schools of thought.  It seems (and reasonably so) that 
> choices about the amount of bearing will depend on the board and the amount 
> of crown.  But what are the general guidelines as to how much, under what 
> circumstances might you vary that amount, and in which direction, and what 
> are people's general procedures including prestressing vs not prestressing 
> the board?
>   
> Thanks in advance.
>   
> David
> 

                 Hi David I
        I'm to weary to address this completely but yes the net bearing 
should be set according to crown and even if the board is flat but yet 
miraculously sounds legitimate at least some mild amount is needed IMO. I.E. 
on a S7S compression crowned board I doubt for example that there crown 
either by accident or design exceded a 70 or 80 ft radius in the largest part 
of there bellys yet we do find generous amounts of bearing in many of these 
pianos that have aged well. Also Even if the crown spec they were aiming for 
was a 60ft crown realize that on ribs shorter than 24 inches that less than 
2.5 mm of crown woul be measurable on any given day prior to string that is. 
In fact the top two treble ribs would show virtually no measurable crown at a 
60 ft. radius.
  All this to say there is no clear cut answer but I'll bet some opinions 
could be had.
    More later----Regards Dale
           Regards

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