processes finishes t3

• How do you mark out paper/board?

  Pencil, pen, ruler, geometry equipment(compass, set-square,protractor)
• How do mark out textiles?

  Fabric marker, tracing paper, templates, pins
• What are the finishes you could have?

  Paints, varnishes, sealants, preservatives, anodising, electro plating, powder coating, oil coating, galvanisation, cathodic protection
• What are the types of finishing processes?

  Laminating, varnishing, hot foil blocking and embossing
• What is a varnish?


  Used to seal the surface of timber as they absorb deeply into the grain and create a hard wearing, aesthetically pleasing finish
• What is a sealant?


  Provide tough and durable surface finishes on mainly wood, non toxic and allow them to be weather proof
• What is anodising?


  The electrolysis of a metal in an acidic solution. Creating a surface finish on the metal which it transfers the anode onto the surface
• What is electro plating?


  Effective technique used to create protection and add aesthetic
• What is powder coating?


  Charged powder particles and free ions and discharged by a high voltage gun, its quick effective and vivid, doesn't need a solvent
• What is cathodic protection?


  Corrosion control to protect metals, such as pipelines and tanks, by turning metallic metal into a cathode
• What is galvanising?


  Galvanising can be used to protect iron or steel objects. The object is coated in a layer of zinc, the zinc stops water and oxygen reaching the initial metal and stops corrosion.
• What is oil coating?


  Oil coating is used to protect the surface of metals and stop them corroding by applying oil and oil and water don't mix
• What is laminating?


  Layers of material added together. To protect the surface eg Tetrapak
• What is hot foil blocking?


  Used to add coloured and metallic surface detailing to both paper and card
• What is embossing?


  A method of giving paper and card three-dimensional areas by creating a risen area using heat and pressure and a mold
• What is an odd leg calliper?


  Used to mark out parrellel lines from one datum to another, look like portractor just bent and without a part to hold a pencil
• What is a try square?


  Try square are vital to achieve accurate measurements from a specific datum point fixed at a 90 degrees, can be adjusted
• What is a vernier scale?


  Highly precise measuring instrument used for measuring micrometers, look like a spanner with a ruler
• What is a densitometer?


  A densitometer is used to test the materials density by a beam of light that measures its resistance when reflected back records the absorption and calculates relative density
• What is a jig?


  Jigs guide the tools working on a component and make sure it is positioned in the same place.provides accuracy and repeatability
• What is a fixture?


  Used to hold and support a specific peice of work in place ensures repeatability and interchangeability (end off desks)
• What is a go/no go gauge?


  Check single measurement for tolerance range with pass or fail reading
• What are the 4 types of "joining" used?


  Adhesive, mechanical, heat, joining
• What does absorbent mean?


  Means the material is porous such as timber
• Is metal absorbent?


  No as it's not porous it requires contact or other specialist adhesives.
• What is an adhesive?


  a substance capable of holding materials together in a functional manner( like a glue)
• How can plastics be joined with adhesive?


  Chemical bonding
• What are the 3 types of adhesive used mainly for plastic?

  Acrylic solvent cement, tensol, cyanocrylite
• What is adhesive solvent cement?


  Works by softening both surfaces and chemically bonding them together
• What is tensol?


  Adhesive applied to both surfaces and then the materials is clamped for atleast 24 hours to form a strong joint
• What is cyancrylite?


  Known as superglue can be used to join MULTIPILE types of materials forms a quick and strong join
• What are the two types of mechanical joints?


  Semi permanent and permanent
• What are the semi permanent methods of mechanical joinings?


  Nails, screws, nuts and bolts, staple, seam joint
• What is the permanent methods of mechanical joining?

  Riveting
• What is riveting?


  A joining process involving a short metal pin or bolt for holding together two plates of metal; its headless end being beaten out or pressed down when in place by a gun or hot metal riveting or resistance spot riveting( electrodes force from top and bottom to create permanent joint) it's complex and skilled work but efficient
• What are the two types of welding?

  MIG as TIG
• What is MIG welding?


  Metal inert gas (MIG) welding is a welding process in which an electric arc forms between a consumable wire electrode and the workpiece metal(s), which heats the workpiece metal(s), causing them to melt and join. 3000-20000 degrees
• What is TIG welding?


  TIG (tungsten inert gas) welding is a process used to weld metals such as stainless steel as well as non-ferrous metals such as aluminium and copper or magnesium alloys. Up to 20000 degrees
• What are the methods of heat joining?


  Soldering, brazing, welding
• What is solder?


  low heat method (300 degrees) used for joining a range of metals used in jewellery and electronic boards