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UNIT 3 TECHNICAL MATERIALS

UNIT 3 TECHNICAL MATERIALS. WOODS. CLASSIFICATION. SOFTWOODS - PROPERTIES. CONIFEROUS ARE FAST GROWING (20-30 years to mature) TIMBER THAT COMES FROM CONIFEROUS TREES IS OPEN GRAINED IT SPLITS EASILY IT IS WEAK IT IS CHEAP. HARDWOODS - PROPERTIES.

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UNIT 3 TECHNICAL MATERIALS

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  1. UNIT 3TECHNICAL MATERIALS WOODS

  2. CLASSIFICATION

  3. SOFTWOODS - PROPERTIES • CONIFEROUS ARE FAST GROWING (20-30 years to mature) • TIMBER THAT COMES FROM CONIFEROUS TREES IS OPEN GRAINED • IT SPLITS EASILY • IT IS WEAK • IT IS CHEAP

  4. HARDWOODS - PROPERTIES • 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

  5. SOFTWOODS EXAMPLES PINES FURNITURE FLOORS

  6. HARDWOODS EXAMPLES MAHOGANY CAOBA PARTS OF BUILDINGS QUALITY FURNUTURE

  7. HARDWOODS EXAMPLES OAK ROBLE PARTS OF BUILDINGS QUALITY FURNITURE

  8. HARDWOODS EXAMPLES TEAK TECA GARDEN FURNITURE

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

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

  11. MEDIUM DENSITY FIBRE BOARD MDF = DM • 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)

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

  13. WORKING WITH WOODS • TO MEASURE & DRAW, WE USE...

  14. TO CUT, WE USE ...

  15. TO HOLD, WE USE ...

  16. TO HOLE, WE USE ...

  17. TO SAND & RASP, WE USE ... SANDING PAPER SET OF RASPS

  18. TO JOIN, WE USE... GLUE GUN & GUN ROD

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

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

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

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

  23. THE END

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