UNIT 2

UNIT 2

1. Raw materials

   • Are products extrated directly from nature
     • Animal origin
     • Plant origin
     • Mineral origin

2. Natural and processed materials

   • Industrial processes are applied to raw materials, to turn them into processed materials
     • Once the materials have been processed, they can be
       • artificial
       • synthetic

3. The properties of materials

   • Mechanical properties
   • Thermal prperties
   • Enviromental properties

4. Tools

   • Tools are objets designed to carry out mechanical work and tasks

5. Wood and tipes of wood

   • Wood is the fibrous material that trees are made of
     • It is made up of two main substances: cellulose and lignin
     • Types of wood
       • Non-resinous
       • Resinous

6. Forms of wood

   • Natural wood
   • Prefabricated wood

7. Properties of wood

   • Density
   • Hardness
   • Flexibility
   • Toughness
   • Thermal and electrical insulation
   • Sound conductiviti
   • Splitability
   • Hygroscopicity

8. Wood working tools

   • Cutting tools
     • Basic hand saws
       • Hand saw
       • Tenon saw
     • Hacksaws
       • Fret saw
       • Hacksaw
     • Machine tools
       • Circular saw
       • Jigsaw
   • Impact tools
     • Hammers
       • Cross-pen hammer
       • Claw hammer
     • Mallets
       • Nylon and rubber mallets
   • Assembly tools
     • Spanners
     • Screwdrivers