All Junior Cert Material Technology Wood posts
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    Woodwork Short Notes Savvyisgreat

    DEFORESTATION:

    -> EFFECTS:

    1. avatar image

      Savvyisgreat

      DEFORESTATION:

      -> EFFECTS:

      Reduces oxygen in the atmosphere,

      Increases the likelihood of flooding in deforested areas

      Increases global warming

      Increases soil erosion in deforested areas.

      -> SOLUTIONS:

      Use native woods over tropical woods

      Use woods from suitable forests (FSC labelled)

      Use manufactured boards over tropical woods

      Use veneered manufactured boards

      Plant trees within local communities

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      Savvyisgreat

      ADHESIVES - TYPES AND QUALITIES OF ADHESIVES

      -> POLYVINYL ACETATE (PVA GLUE):

      Water soluble

      Ready to use

      Sets in 4 - 12 hours

      -> SCOTCH GLUE

      Water soluble

      Used in veneering or furniture restoration

      Not very strong

      -> CAESIN GLUE

      Strong

      Easy to mix

      Used in woodwork projects, toys or models

      -> EPOXY RESIN

      Expensive

      Quick setting and strong

      Bonds metals, glass, wood, etc.

      -> SUPER GLUE

      Expensive with small packaging

      Sets in seconds

      Used in small bonding jobs

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      Savvyisgreat

      CARVING

      METHODS OF CARVING: Chip carving, Relief Carving, and Carving in the round (3D carving)

      HOW TO TRANSFER A DESIGN ONTO WOOD USING CARBON PAPER:

      1. Collect the wood, the design, carbon paper, sellotape and a pencil.

      2. Sellotape the carbon paper onto the wood.

      3. Sellotape the design over the carbon paper.

      4. Trace over the design with a pencil.

      5. Make sure all lines have been traced before fully removing the carbon paper and the design.

      6. The design should be present.

      HOW TO CARVE IN THE ROUND - MARKING OUT AND CARVING.

      -> MARKING OUT

      1. Draw the elevation(s) and plan(s) of the design onto paper.

      2. Transfer the images onto the wood using carbon paper.

      -> CARVING

      1. Cut the rough shape of the design using a coping saw or band saw.

      2. Using gouges and shaping tools develop the overall final shape of the piece.

      3. On the rough, draw and carve the finer details using chisels and other tools.

      4. Sand and finish.

      WOODS SUITABLE FOR CARVING:

      Aspen

      Basswood

      Butternut

      -> REASONS FOR CHOICE OF WOOD

      Cost, Appearance, Durability, Work ability, Finishes well, Renewable, Environmentally friendly.

    4. avatar image

      Savvyisgreat

      CONVERSION

      THROUGH AND THROUGH SAWING

      -> ADVANTAGES

      Low cost

      Little waste

      Fast method

      -> DISADVANTAGES

      Boards are likely to cup

      No particular grain pattern

      Less durable as there is a lot of sapwood present

      QUARTER SAWING / RADICAL SAWING

      -> Advantages

      Attractive grain pattern

      Boards are not likely to shrink

      Boards wear evenly (good for flooring)

      -> Disadvantages

      Expensive, High labor cost

      Lots of waste is produced

      Boards are not as wide as in plain sawing

      TANGENTIAL SAWING

      -> ADVANTAGES

      Flame like grain pattern

      Boards season quickly

      Boards can take nails without splitting because of the grain pattern

      -> DISADVANTAGES

      Boards tend to shrink and cup

      Timber is prone to warping and cupping

      Expensive as the log has to be turned 90° for each cut

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      davidbrown1210

      do you think manufactured boards will come up in question 3? what design processes do you think will come up on question 2

    6. avatar image

      Savvyisgreat

      (Its a bit late, >.> sorry lol)

      Manufactured boards didn't come up this year, but they probably will next year.

      TYPES OF MANUFACTURED BOARDS:

      Block board

      Plywood

      Oriented Strand Board (OSB)

      Chipboard

      Medium Density Fiberboard (MDF)

      Hardboard

      HOW CHIPBOARD IS MANUFACTURED:

      1. The wood is processed into particles

      2. The particles are mixed with adhesive

      3. The particles are spread out and pressed with heat presses.

      4. The wood is seasoned

      5. The boards are cuts and sanded.

      ADVANTAGES MANUFACTURED BOARDS HAVE OVER REGULAR BOARDS:

      Less likely to cup

      Higher durability

      Cheap in large quantities

      Environmentally friendly

      Can be veneered to resemble hardwoods

      WAYS MANUFACTURED BOARDS HELP THE ENVIRONMENT:

      Can be used instead of tropical woods

      Can be veneered to resemble tropical woods

      Are more durable and long lasting then solid boards.

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      Me

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