Flashcards in Wood 2 Deck (51)
tough fibrous cellular substance that makes up most of the stems and branches of trees beneath the bark.
softwood and hardwood
two types of wood
conifers (evergreens) which have needles instead of leaves , ex. pine
broad-leaved trees or deciduous trees.
sapwood and heartwood
structure of wood
softer,younger outer portion of a tree, usually lighter in color
older,harder central portion of a tree, darker than sapwood. Central core of the log
defects of wood
caused by the attack of fungi
cracks or lengthwise separation across the annual rings caused by irregular shrinkage during drying.
cracks between and parallel to the annual rings.
irregular growth in the body of a tree which interrupt the smooth curve of the grain.
well-defined openings between annual rings.
lack of wood on the edge or corner of a piece
caused by unequal shrinkage of the board.
types of warping
distortion of the board. Long edge is convex or concave
face is convex or concave longitudinal
convex or concave across the board
one corner is raised
methods of sawing wood
lumber cut tangent to the annual rings. rings at an angle 0 to 45 degrees
wood cut radially to the annual rings or growth parallel to te rays. angle 45 degrees to 90 degrees.
30 to 60 degrees angle to the center of the timber.
woods suitable for use as a building material
timber product manufactured by sawing, etc.
lumber that is surfaced with planing machine to attain a smooth surface and uniform size. s2s,s4s
saw,edged and trimmed but not surfaced
lumber seasoned in a kiln