NY Steinway Ribs and MC

[Richard Brekne]

Hi Stéphane

Are you sure about your panel moisture figure ?  8 % MC is very very 
high... especially for Europe. Perhaps this was a typo ?

Cheers
RicB



    Hi Ric and all.

    I take the opportunity of this thread to do the comparison with the
    default
    protocol at Ciresa in Italy.
    They insist that they can do anything on customer's specifications,
    but this
    is what they do when the customer doesn't give any.

    The ribs are flat to begin with.
    The surface of the press on which the soundboard is put for ribs
    gluing and
    crowning can be bended in variable modes, according to the soundboard
    dimensions and the desired target crowning.
    Panel moisture at gluing time is 8%
    Ribs moisture at gluing time 8 - 10 %
    Temperature of the hot box is 42° C  and relative humidity of the
    air inside
    30 %

    Crowning data for a board 150 cm x 220 cm large :

    Rib 1 (treble side) 232 mm long, 1,5 mm between middle of the flat
    rib and
    the curved board.
    Rib 5 : 396 mm long, 3,5 mm ...
    Rib 8 : 798 mm long, 10 mm ...
    Rib 11 (maximum) : 1235 mm long, 18 mm ...
    Rib 14 (last one) : 813 mm long, 9 mm ...

    Remaining crown measured one week later in a 22,5 ° C  45% relative
    humidity
    environment :

    Rib 1 : 0,9 mm
    Rib 5 : 1,9 mm
    Rib 8 : 3,9 mm
    Rib 11 : 8,8 mm
    Rib 14 : 4,5 mm

    I'm just discovering this part of the picture, but I'm sure these
    data will
    mean more for all you who daily have your hands on it.
    As always, your comments enlight my darkness.
    Seems to me that in this process, the board is dried much less than
    in your
    protocols.  Would this mean that these data are intended for a quite
    humid
    climate ?
    Also strikes me the small difference between board and ribs moisture
    content.

    Best regards.

    Stéphane Collin.