WOOD AND TOOLS

WOOD AND TOOLS

1. Raw materials are products extracted directly from nature . They may be of plant , animal or mineral origin.

2. Natural and processed materials. Industrial processes are applied to raw materials , also known as natural resources, to turn them intoprocessed materials.

3. The properties of materials

   • Mechanical properties
     • Hardeness, mechanical resistance, toughness, brittleness, elasticity, plasticity
   • thermal properties
     • Exoansion, thermal conductivity
   • enviromental properties
     • Toxicity, recyclability, environmental hazard, biodegradability

4. Tools. There are many different kinds of tools , wich are suitable for a wide range of activities.

5. Wood. Is the fibrous material that trees are made of. It is made u of two main subtances: cellulose and lignin

   • Types of wood
     • Non-resinus
     • Resinous
   • Properties of wood
     • Hardness
     • Thermal insulation
     • Flexibility
     • Density
     • Hygroscopiciy
     • Sound conductivity
     • Splitability
     • Toughness

6. Forms of wood

   • Strips
     • Profiles
       • Planks
         • Beams
           • Panenls
             • Sheets

7. Wood working tools

   • Saws
     • Hacksaws
       • Machine tools
         • Hammers
           • Mallets
             • Spanners
               • Screwdrives

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