| Wood
joints are designed to overcome the problems
associated with gluing to end grain. The main
problem is that end grain is very porous and
glue is drawn into end grain to the point where
there is very little strength in the glued
joint. Wood joints are designed so that the
wooden pieces being joined are glued on the
sides as well as on the end. Wood joints that
form a mechanical joint and increase the gluing
area make very strong permanent methods of
fixing.
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| Pine
armchair |
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| Chair
depth = 400 |
Front
legs = 600 x 50 x 50 |
| Chair
width = 500 |
Back
legs = 850 x 50 x 50 |
| Seat
height = 460 |
Chair
rails (1) = 300 x 80 x 50 |
| Arm
rest height = 600 |
Chair
rails (2) = 400 x 80 x 50 |
| Chair
height = 850 |
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Draw
the chair and use notes and sketches to
illustrate:
- suitable
joints between the rails and legs;
- how a
suitable seat could be fitted;
- how a
suitable back could be fitted;
- how the arm
rests could be improved so that they would
be more comfortable to use.
Add dimensions to
your drawings.
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| Living
room sideboard
The drawing
shows a design for a living room sideboard made
of mahogany faced chipboard. Use notes and
sketches to illustrate:
- how parts of
the structure could be fixed together so
that fixings do not show;
- why the back
of the sideboard is an important part of the
structure;
- the type of
screws and fixings that are available for
fixing manufactured boards together
- how iron-on
edging could be used to finish exposed
chipboard edges;
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- how solid
mahogany can be used to cover exposed
chipboard edges on mahogany faced chipboard;
- why the base
of the sideboard may be stepped back;
- the problem
with using this type of design on an uneven
floor;
- how the
problem of an uneven floor may be resolved
in this design of living room sideboard;
- how
solid mahogany can be used to give
attractively shaped edges on a mahogany
faced chipboard top.
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Designing Toys
This
section of the Design and Resistant Materials
Technology package contains design
exercises that include:
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A
Rocking Motorbike
Look at the photograph of the wooden
motorbike.
All parts of the
motorbike are made of pine.
The parts are
glued and screwed together.
All the screw heads are set in
counterbores and the holes are plugged
with wooden plugs.
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Exercises
- Describe how
the motorbike wheels could be made.
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- Describe how
the motorbike forks could be made.
- Describe how
the main body of the motorbike could
be made.
- Describe how
the components could be given a
smooth finish.
- Name a suitable
adhesive for permanently fixing the
parts together.
- Name a suitable
“finish” for the motorbike.
- Describe risks
that children may face by using the
motorbike and how these risks could
be minimised.
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Designs
That Use Wheels
This
section of the Design and Resistant Materials
Technology package contains design
exercises that include:
|
A
ship’s wheel (steel)
A modern yacht steering
wheel is usually large and made of
stainless steel.
One of the reasons why a yacht’s
steering wheel is large is so that the
helms person (the driver) can easily
reach the wheel from a standing position
and from both sides of the cockpit.
Draw a modern ship’s wheel and use
notes and sketches to illustrate: |
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- the way
that a stainless steel tube could be bent
into a perfect circle;
- the way that
thinner stainless steel tube spokes could be
fitted to a central wheel hub and to the
wheel;
- a jig that
would enable all the components to be held
in their correct relative positions during
assembly and fixing;
- the way that
all the stainless steel components could be
permanently fixed together;
- details of the
wheel hub, showing the way that the wheel
could be located and secured onto a morse
tapered and keyed steering shaft.
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Design
Analysis Exercises: Lamps
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| This
section of the Design and Resistant Materials
Technology package contains design
analysis exercises that include:
Desk Lamp
Draw the lamp
stand and number the individual components.
Use detailed notes and sketches to illustrate
how:
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-
each
part of the stand could be made.
-
each
part of the stand could be fixed together.
-
the
electric cable could be fed from the bulb
holder to the lamp base.
-
the
glass lamp shade could be held in place.
-
a
shiny finish could be maintained on the lamp
base.
Keeping
the top half of the lamp the same, redesign the
base and lower half of the stand so that it will
be either:
i. simpler and cheaper to make;
ii. improve the look of the lamp;
iii. improve the function of the lamp. |
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Design
Analysis Exercises: Tools
|
| This
section of the Design and Resistant Materials
Technology package contains
design analysis exercises that include: |
| Nail
Punch
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- Explain what a
nail punch is used for.
- Draw a typical
nail punch.
- Explain why
the end of a nail punch is slightly
recessed.
- Use notes and
sketches to explain two ways of producing a
recess in the end of a nail punch. (One
method would be produced when the metal is
bright red hot and the other method when the
metal is cold).
- Explain why a
nail punch has a part that is knurled.
- Describe the
process of hardening and tempering a nail
punch.
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| This
section of the D&RMT package contains design
analysis exercises that include: |
Design
Analysis Exercises: Kitchen
Ware
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|
Mortar
and pestle
A mortar and pestle is used for pulverizing
substances such as spices. The mortar and pestle
illustrated in the photograph is made of brass.
Use notes and
sketches to illustrate:
- the process of
making the mortar (the bowl) by sand
casting;
- how the inside
of the mortar could be polished to a smooth
and shiny finish;
- how the
outside could be given a decorative texture;
- how the pestle
could be made by sand casting;
- how the pestle
could be given a smooth and shiny finish;
- how the pestle
could be made by turning brass bar on a
lathe.
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