tapping strings

[David Skolnik]

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Richard B -

Yes, that's what I wanted to know.  You apparently do not use gauges, 
whether bubble or rocker or other. A little clarification would be helpful, 
as follows:

At 07:04 PM 04/07/2002 +0200, you wrote:
>Hi David
>
>I kind of hedge myself with downbearing measurements. I do two things. First
>I measure the height of the bridge in various spots both before and after
>tension is let down.

How do you measure bridge height? When you say "before and after tension is 
let down", do you mean on a particular note?

>Secondly I take string deflection measurements with
>tension off the panel.

Does 'panel' mean soundboard?

>The way I do the second is perhaps what you are asking for.
>I run a taught cloth string from the tuning pin under the front termination
>and across the bridge and position the back height such that it just touches
>the bridge but is not deflected by it. Then I measure the distance to the
>string rest. Then I bring the string just down to where it touches the back
>edge of the bridge and measure again the distance to the string rest. Both
>measurements are taken on the normal (90 degrees) from the string rest. This
>gives enough to calculate  both the front bearing angle and rear angle.

I don't understand this last statement.  Also, it's not clear to me if you 
are describing measuring  the bearing of a strung piano, or one which you 
are, or have destrung.  I was particularly curious about how you went about 
measuring the downbearing of a functional, or, using Ron N's parameters, a 
non-functional piano.

Hope you're not getting board with this.

David Skolnik


>Is this what you were asking about then ?
>
>David Skolnik wrote:
>
> > Richard B -
> > Thanks for your thorough response, a few points of which I would like to
> > pursue, but I'll probably break it up into individual posts, as I'm
> > supposed to be taking my daughter to an ice skating lesson right now.
> >
> > At 01:42 PM 04/07/2002 +0200, you RicB, wrote:
> >
> > >Measuring down bearing ?? Hmm.... I suppose
> > >much like I do otherwise.
> >
> > Clearly, I'm asking for a reason, but I wonder if you would indulge me a
> > little further and explain your method.
> >
> > David S
>
>
>
>
>--
>Richard Brekne
>RPT, N.P.T.F.
>Bergen, Norway
>mailto:rbrekne@broadpark.no
>http://home.broadpark.no/~rbrekne/ricmain.html

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