laconi a écrit :alors comment connais ton le grade precis des bois utilisé pour chaque modele?
et au moins savoir si ils sont differents d'un modele à l'autre.

une petite indication tirée de l'UMGF, grâce aux infos de Linda Wallen-Davis (acheteuse de bois chez Martin)
Generally applied wood grades
Sitka Spruce and Red Spruce tops have 8 grades based on tightness of grain, straightness, color, degree of quartersawing, silking, internal defects (such as sap pockets, occlusions, etc.) and overall cosmetic appearance:
No grade given – 16’s and below
Grade 1 / 2 – 18’s and 21’s
Grade 3 / 4 – 28’s and 35’s
Grade 5 / 6 – Herringbone, Vintage, and 40’s
Grade 7 – 41's and 42’s
Grade 8 – 45’s
Higher grades can be used on lower models on a discretionary basis depending upon availability.
East Indian Rosewood has 4 grades, based on factors such as grain tightness & straightness, color and cosmetics:
Grade 1 - 16's and 15's
Grade 2 - 20 and 30 series instruments
Grade 3 - Herringbone and Vintage 20 and 30 series instruments
Grade 4 - 40 series instruments
Madagascar Rosewood has two grades:
Grade 2 - is "28-style" grade
Grade 4 - is "45-style" grade
Non-figured Mahogany has 4 grades based on straightness of grain and other cosmetics:
Grade 1 - 15's
Grade 2 - 16's
Grade 3 - Standard 18's
Grade 4 - 18V's, GE's, and A's
Figured Mahogany has 2 grades based on amount of figure:
Grade 2 - lesser figure
Grade 4 - highly figured
Koa has 2 grades based on the amount of figure:
Grade 2 - 16's and 28's
Grade 4 - 40's style instruments
Note: Martin does not "tap-test" its wood or otherwise grade according to tone. The above grades reflect cosmetic characteristics only.
Martin Laminates
Martin's Mahogany laminates are quarter sliced Bigleaf Mahogany faces (outer plies) with a rotary sliced African mahogany core, and the Rosewood laminates are quarter sliced Indian rosewood faces with a rotary sliced African Mahogany core.
Many thanks to Linda Wallen-Davis (cfmwoodbuyer) of CFM&Co. for providing this info and to BareCat for consolidating it all so that I didn't have to do the work!!