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 (OnGuard may be an excellent resource for this question).
BAND
SAW
Considerations
that should be taken place:
·
Only
one person using the machine at one time
·
Any
hair should be tied back or in a hair cap
·
All
items of clothing are tied back
·
Safety
glasses must be worn
·
Make
sure blade is in properly
DISC
AND BELT SANDER
Considerations
that should be taken place:
·
Safety
glasses must be worn
·
Make
sure sanding disc and belt is in good condition
·
Make
sure you know what direction the belt and disc in going
·
Keep
any cords, objects and tools away from sander
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
|
|
Poly vinyl chloride
|
PVC
|
strong
rigid solid
|
pipes,
siding, flooring
|
|
Polystyrene
|
Polystyrene
|
Can be transparent, white or any colours. Very light, hard and brittle
|
A
large portion of polystyrene goes into packaging. The thin, rigid,
transparent containers in which fresh foods, such as salads, are packaged are
made from polystyrene. Polystyrene is readily foamed or formed into beads.
These foams and beads are excellent thermal insulators and are used to
produce home insulation and containers for hot foods. Styrofoam is a trade
name for foamed polystyrene. When rubber is dissolved in styrene before it is
polymerized, the polystyrene produced is much more impact resistant. This
type of polystyrene is used extensively in home appliances, such as the
interior of refrigerators and air conditioner housing.
|
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.
·
In compression molding the lower part of a two-part mold is filled
with plastic granules (a).
· The top part is lowered to
apply heat and pressure (b).
·
The
molded piece is then removed (c).
