PROCEDURES
120
Building mechanisms
Mechanisms can be built in many ways, and the techniques that we
use are always evolving. However, mechanisms and their parts must
be made carefully and precisely, so that they will work properly.
In the workshop, we can make simple
mechanisms using a variety of materials,
such as wood, nails, cardboard and paper.
Apply
43.
What other materials could you use to make pulleys or gears? How would you use those materials?
MAKING PULLEYS
We can use the following materials and tools to make pulleys:
❚❚
Materials
: cardboard, corrugated paper, construction paper, plywood, chipboard,
wooden dowels
❚❚
Tools
: pencil, compass, protractor, scissors, utility knife, hacksaw
Pulley A
is made from three plywood discs and a wooden dowel. The disc in the centre
is smaller and thicker.
Pulley B
is made with a strip of corrugated cardboard in the centre. The discs on the
sides are made of construction paper.
You can also use thick chipboard or wood to make a pulley. In that case, you must cut a
groove around the outside of the disc.
Think of other ways to make pulleys and try them out.
Warning
:
try to avoid accidents. Be very careful when you work with sharp tools.
MAKING GEARS
Industrial gears are normally made of metal or plastic. In the workshop,
we can make gears from plywood or chipboard. Follow the instructions
below:
1.
Use a compass and protractor to draw a gear.
2.
Use a hacksaw to cut out the gear, following the lines.
3.
Sand the teeth. They must be smooth and even.
Pulley A
Pulley B
ADVANCE
EDITION
