UNIT 3 TECHNICAL MATERIALS WOODS CLASSIFICATION WOODS MANMADE

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UNIT 3 TECHNICAL MATERIALS WOODS

UNIT 3 TECHNICAL MATERIALS WOODS

CLASSIFICATION WOODS MANMADE NATURAL BOARDS SOFTWOODS HARDWOODS They come from coniferous trees. They are

CLASSIFICATION WOODS MANMADE NATURAL BOARDS SOFTWOODS HARDWOODS They come from coniferous trees. They are ever green, and have got NEEDLE shaped leaves They come from decicious trees (they lost their FLAT leaves in autumm)

SOFTWOODS - PROPERTIES n n n CONIFEROUS ARE FAST GROWING (2030 years to mature)

SOFTWOODS - PROPERTIES n n n CONIFEROUS ARE FAST GROWING (2030 years to mature) TIMBER THAT COMES FROM CONIFEROUS TREES IS OPEN GRAINED IT SPLITS EASILY IT IS WEAK IT IS CHEAP

HARDWOODS - PROPERTIES n n n DECICIOUS TREES ARE LOW GROWING (100 years to

HARDWOODS - PROPERTIES n n n DECICIOUS TREES ARE LOW GROWING (100 years to mature) TIMBER THAT COMES FROM DECIDIOUS TREES IS CLOSE GRAINED IT DOES NOT SPLIT EASILY IT IS STRONG IT IS EXPENSIVE

SOFTWOODS EXAMPLES

SOFTWOODS EXAMPLES

HARDWOODS EXAMPLES

HARDWOODS EXAMPLES

HARDWOODS EXAMPLES

HARDWOODS EXAMPLES

HARDWOODS EXAMPLES

HARDWOODS EXAMPLES

BLOCKBOARD n n IT IS MADE FROM SOFTWOOD STRIPS BONDED WITH AN ADHESIVE. IT

BLOCKBOARD n n IT IS MADE FROM SOFTWOOD STRIPS BONDED WITH AN ADHESIVE. IT IS USED FOR FURNITURE MANUFACTURING (internal parts)

CHIPBOARD n n n IT IS MADE FROM SMALL CHIPS OF WOOD BONDED WITH

CHIPBOARD n n n IT IS MADE FROM SMALL CHIPS OF WOOD BONDED WITH A RESINE IT IS USED IN FURNITURE MANUFACTURING. IT IS CHEAP

MEDIUM DENSITY FIBRE BOARD MDF = DM n n n IT IS MADE FROM

MEDIUM DENSITY FIBRE BOARD MDF = DM n n n IT IS MADE FROM WOOD DUST AND RESIN, AND THEN PRESSURED INTO A BOARD. IT IS EASY TO WORK (machine, cut, paint. . . ) IT IS USED IN CHEAP FURNITURE (internal parts)

PLYWOOD n n IT IS MADE FROM VENEERS OF TIMBER BONDED BY A RESIN.

PLYWOOD n n IT IS MADE FROM VENEERS OF TIMBER BONDED BY A RESIN. THE GRAINS OF THE VENEERS ARE PERPENDICULAR EACH OTHER.

WORKING WITH WOODS n TO MEASURE & DRAW, WE USE. . .

WORKING WITH WOODS n TO MEASURE & DRAW, WE USE. . .

TO CUT, WE USE. . .

TO CUT, WE USE. . .

TO HOLD, WE USE. . .

TO HOLD, WE USE. . .

TO HOLE, WE USE. . .

TO HOLE, WE USE. . .

TO SAND & RASP, WE USE. . .

TO SAND & RASP, WE USE. . .

TO JOIN, WE USE. . .

TO JOIN, WE USE. . .

PHSICAL PROPERTIES The relationship between MASS and VOLUME DENSITY The ABILITY of being sratched

PHSICAL PROPERTIES The relationship between MASS and VOLUME DENSITY The ABILITY of being sratched by other material HARDNESS

The property of resisting PULLING forces TENSILE STRESS PULL The property of resisting PUSHING

The property of resisting PULLING forces TENSILE STRESS PULL The property of resisting PUSHING forces COMPRESSION STRESS PUSH

The property of being BENT. . . The ability of resisting the action of

The property of being BENT. . . The ability of resisting the action of living organisms, moisture. . . FLEXIBILITY DURABILITY

The ability to TRANSFER HEAT The ability to allow the FLOW OF ELECTRONS THERMAL

The ability to TRANSFER HEAT The ability to allow the FLOW OF ELECTRONS THERMAL CONDUCTIVITY ELECTRIC CONDUCTIVITY WOODS ARE GOOD THERMAL & ELECTRICITY INSULATORS

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