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Published byIra Mitchell Bell Modified over 9 years ago
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Hardwood (Deciduous) - Reproduce by encased nuts and seeds Softwood (Coniferous) - First trees - Reproduce by seed on their cone Misleading?
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South, central and north region s in US
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Pith- Center of tree Annual rings- Rings around pitch - Earlywood (Spring)/Latewood (Summer) Bark- Outside layer of tree - Cambium- Where growth takes place - Two parts Phloem (bark cells)/Xylem increase tree circumference that creates sapwood (Light part of inner tree) Heartwood- Dark part of inner tree that stores minerals (Like human spine) Medullary rays- Carry water and nutrients across the tree Soil, minerals and temp impact growth
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Select cutting Clear cutting Seed cutting
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Cut by foresters and loggers Limbs removed Put on travel truck Shorted by species and best looking (Veneer) Taken to saw mill 1. Trees debarked 2. Metal detector?????? 3. Squared up by band saw or circular saw (cant/slab wood) 4. Sawed into boards called plainsawn or cut the log into 4 quarters and then get boards from there called quatersawn lumber 5. Edges trimmed off to produce uniform board 6. Go to grader 7. Go to dry- Air or Kiln dry to make roughlumber (only three sides cut) 6-8% moisture content
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Happen in growth of tree or during drying process Knots-Portion of branch that was part of tree, can be loose or tight Blue stain- Discoloration caused by mold or fungus, left in high humidity Pitch pocket- Opening of wood that contains resin (solid or liquid) Bark pocket- Bark material that was enclosed as the tree grew
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During milling and drying Warp- Deviation from true surface 1. Bow - Curve along the face of the board 2. Crook- Curve along the edge of the board 3. Cup- Curve across the width of the board 4. Twist- Looks like a spiral 5. Kink- Deviation along the board caused by a knot
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Ordered by its normal size but its actual size is different Sold by piece EAMPLE: 1x8x10 is really ¾ x 7 ¼ x 10 Come in lengths from 8 foot up and in two foot increments Anything bigger than 16 foot may need to special order
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Sold by board foot (Unit of volume measuring 12 inches wide, 12 inches long and 1 inch thick) Width and lengths are not standardizedm because the producer wants the best yield Indicated thickness by quarter of an inch Example: 4/4 is an inch thick You could buy a 8/4 thick piecex5 inchx7 feet long
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Volume of on board is 144 cubic inches Volume=Width x Length x Thickness EXAMPLE: you buy one board that is 4/4 thick, 8 inch wide and 11 feet long. Also buy one that is 8/4 thick, 5 inch wide and 7 feet long. How board foot is he buying? 1. 1 x 8 x 132=1056 cubic inch 2. 1056/144= 7.33 board feet 3. 2 x 5 84=840 cubic feet 4. 840/144=5.83 board feet 5. 7.33+5.83=13.16 board feet
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Appearance of board Determined by species of tree, conditions it grew in, way the wood was cut How strong the wood is Effects stability of material, gluing properties and finishing End Grain- Grain on edge of board Edge Grain- Grain on face of board - Radial Grain- cut along radius running from center of tree outward (quarter sawing produces this because grain is straight) - Tangential Grain- Few years growth
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