Virtual Ribs, A new crown support method

[gordon stelter]

Now THIS is a  neat idea! 
     Thump


--- Ric Brekne <ricbrek@broadpark.no> wrote:
> Hi David
> 
> Yes, the soundboard is forced up. Impair movement of
> the soundboard ? 
> Well yes... that is in a sense what supplying
> stiffness does. One can do 
> that in many ways.  Traditionally rib dimensions,
> thickness of the 
> panel, proximity to soundboard termination points...
> and other 
> mechanisms are used yes ??.
> 
> But there is no real reason why you cant supply
> crown support and 
> stiffness in other fashions. What I like about this
> idea is that it 
> relies on a kind of virtual beam... not really
> connected to the 
> soundboard physically.  Similiar to Dels idea with
> valve springs in 
> concept, yet no physical contact between panel and
> the support system 
> for the springs. Combined with ribbing either any
> kind of soundboard 
> assembly you can get all kinds of auxiliary support.
>  In the case of an 
> old flat panel, you can restore significantly a
> condition of crown which 
> very closely compares to the origional I would
> think.  It certainly made 
> a big difference in the sound on this beater.  The
> workable range seems 
> to be between 2 and 5 mm seperation.  That ends up
> being quite a range 
> of adjustment in terms of pounds of pressure. What a
> SB designer can do 
> with the idea .... who knows ?
> 
> I put two of these on a scale the other day... on
> mounted on the scale, 
> the other forced against it by hand.. I could get
> fairly easily 60 
> pounds of pressure before my hand was not stable
> enough to hinder 
> sideslip.  Magnets have to be alligned pretty
> carefully when used like 
> this.
> 
> Cheers
> RicB
> 
> Hi Ric,
> 
> As I understand it...magnets opposing each other are
> aligned, one set in the bridge and one set along the
> beams 
> under the bridge.   The soundboard is forced up?  
> Is is possible this would impair movement of the
> soundboard?  
> Are you drilling a hole in the bridge and inserting
> one of the magnets there?   Interesting experiment
> ...
> 
> David Ilvedson
> 
> 
> 
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