chisels over to bridge height

[RicB]

Hi Gene

Yes, if you want to be able to locate the right height of the bridge 
surface at the notch when thats done this way, then your cut for the 
middle string has to pretty much represent where the notch edge ends 
up.  No doubt being a mm off or so will not make much difference to the 
end height except perhaps way up in the treble.  Avoiding any cut that 
would go to far in (and deep) towards the center of the bridge goes 
without saying.

I'm new at this, so if you are going to get experienced advice then some 
of the seasoned rebuilders will have to jump in for you.

Cheers
RicB


    I am curious if part of the indexing could include locating the
    speaking
    length for the sample notes? Otherwise how would one know where the
    notch
    will be - or maybe just close enough is ok? I would think that notching
    about 1mm or so from where the bridge pins will be drilled may be
    advantageous for later finish notching and will not matter that much
    to the
    bearing?
    Thanks for any thoughts.
    Gene Nelson


         > Hi Terry
         >
         > Thanks for the answer on this.  I got another answer just
        today from a
         > friend in Danmark who says Bosendorfers do their bridges this
        way.  The
         > bridge is fixed on the panel, soundboard temporarily screwed
        down and its
         > placement indexed, and then one runs a thin string... fishing
        line..
         > whatever... from the middle string hole in the agraffe to the
        middle hitch
         > pin, usually for each A on the long bridge... or something
        like that.
         > Then a chisel is use to make a cut like a notch edge back to
        where the
         > notch will be.  The wire (fishing line) is then run through 
        to gauge the
         > bridge height and one planes down to the desired height and
        angle.  The
         > string in this scheme should leave the back of the bridge and
        make no
         > angle downwards to the hitch pin so you dont need to worry
        about doing the
         > same thing on the back side of the bridge.  Seems easy and
        sensible
         > enough.
         > So.... problem solved.  I'm just waiting for the final scale
        figures from
         > a designer over here before proceeding.  The trick with the
        rib notches
         > and epoxy putty works great... btw.  Poifict fit as it twere.
         >
         > Cheers
         > RicB