[CAUT] Adusting SP / lighter touchweight

[Richard Brekne]

Just a quick note on this.  A great way of finding just how much to move 
things forward and back regardless what you are moving is to mark the 
existing position of the front of the key frame, ascertain optimal SP by 
moving the frame appropriately, and measuring the difference between 
your original mark and your new position. You have then exactly how much 
you need to move stack or hammers or whatever your choice is.

Course in  Jons example below the dags are in the way, but more often 
then not this works just dandy.

Cheers
RicB


    How about this one:
    Lots of room between front of keys and keyslip. New hammers on new
    shanks
    (17 mm knuckle radius), standard shank length, top treble tone dead.
    Keyframe
    backed into dags, can't slide back to ascertain Strike Point.  Lift
    treble frame
    registering pin with screw driver to tilt the hammer back: improves
    tone.

    Ok, the Strike Point (SP) is too far forwards.

    Can't slide the frame back unless I remove material from the back
    edge of the frame
    but the sharps are already precariously close to the fall board.
    Hmmmm...
    lots of room at the fro=nt of the keys...

    So, pull the hammers and set further out on the shanks? Install new
    h/s/f ?

    Look at the stack.  The capstans are center in the treble and muchly
    rear
    of center of the cushions in the bass.  What's that doing for the ratio?

    Solution, move the stack back such that the capstan is situated at
    the same position
    on the cushion bass -to-treble, move keyframe forwards a sufficient
    amount to tweak
    treble SP. The stack moves back a little in the treble and a lot in
    the bass.
    Hammers are no longer raked over missing the centers of the ends of
    the wippens.
    Jacks are not buried into the rep stop felts. (also had shim the
    whole stack towards the bass the thickness of veneer).

    BTW, this is a Hamburg B.

    Assume nothing.  I don't care how many RPT's it previously went through.
    -- 

    Regards,

    Jon Page