1. Choose 2 machines that you used in the fabrication of your desk tidy. With these machines in mind, outline WPH&S considerations that must be adhered to when using these machines. Include photographs of your chosen machines (On Guard may be an excellent resource for this question).

Disk and Belt Sander Machine:

 
. All hair and clothes must be tied back and tucked in to unsure nothing gets caught.
. Safety goggles and aprons must be worn at all times so nothing can get into the eyes and to keep your uniform clean.
. Make sure the area is clear and that no one else is inside the yellow lines to prevent injuries.
. Make sure nothing is loose on the machine and once finished the machine is properly turned off.


Band Saw:

. Safety goggles and apron are worn at all times.
. Only one person is to use the band saw at a time.
. Make sure before using that the blade is in properly and nothing is loose or broken.
. make sure before the machine is switched on that the area is clear and there is not loose pieces of plastic that could flick up and cause injury.


 2.    The material you are using for your desk tidy is called Polymethylmethacrylate (ACRYLIC). It has specific properties and uses.  Choose 2 other common polymers and in table form give their industrial name, common name, properties and uses.

Name	Common Name	Properties	Uses
Polyethylene Terephthalate	PET	Hard, stiff, strong,	In soft drink bottles and other blow-moulded containers.  Also food and non-food containers.
Polyvinyl Chloride	PVC	Hard, solid and ridged	Flooring, Siding and pipes

3.    Extrusion, injection moulding, compression moulding, vacuum forming and laminating are examples of common manufacturing processes used with polymers (Plastics). Choose one process and with the use of diagrams and bullet points outline the process.

Process of Injection Moulding:

 

·        Clamping - The moving fixed platens holds the mould tool together under pressure.

·        Injection - Plastic materials in form of granules are melted until it is soft enough to be injected into the mould.  

·        The melted plastic is then injected into the mould and the shape is exactly copied.

·        Dwelling - After the molten plastic has been injected into the mould pressure is applied to make sure all the cavities are completely filled and there are no gabs or missing spaces.

·        Cooling - The plastic is then allowed to solidify in the mould.

·        Opening - The moving platen moves away from the fixed platen which separates the mould tool.

·        Ejection – a plate, rods or air blast then aids ejection of the complete plastic moulding from the injection mould tool.

·        The mould is cleaned and completed and sent to the factories.