1.
MAKING
SELECTION OF MATERIALS

2.
LEARNING OBJECTIVE
By the end of the lesson you should:
• Be able to Outline and develop a solution based on time, cost, skill
and resources.
• Be able to Infer that making needs to be planned and organized in
detail.
• Analyze how the individual tests may be useful for material selection
in the design work.

3.
Starter
• How does a manufacturer decide on a particular material for a
product?
• What factors need to be taken into consideration?

4.
The materials selection process for a
component or joint between components
involves these steps:
• Identify the design requirements.
• Identify the materials selection criteria.
• Identify candidate materials.
• Evaluate candidate materials.
• Select materials.

5.
Identify the design requirements.

6.
Let’s design a simple Quartz Watch…..

7.
Raw Materials
• Electronic watches make use of many of the most modern materials available,
including plastics and alloy metals. Cases can be made of either plastic or metal;
watches with metal cases often include a stainless steel backing. Microchips are
typically made of silicon, while LEDs are usually made of gallium arsenide,
gallium phosphide, or gallium arsenide phosphide. LCDs consist of liquid crystals
sandwiched between glass pieces. Electrical contacts between parts are usually
made of a small amount of gold (or are goldplated); gold is an almost ideal
electrical conductor and can be used successfully in very small amounts.
•

8.
Where and what kind of plastics are utilized in
watches?
• Research in your group Where and what kind of plastics and metals
are utilized in watches?

9.
Working of Quartz watch

10.
Properties of Plastic
• The flexibility, moldability, low friction, strength,
transparency, opaqueness, and colorable
attributes of these plastics are useful in so many
ways.
• With thermoplastics(polyethylene, polypropylene, polyvinyl
chloride, polystyrene, polybenzimidazole, acrylic, nylon,
and Teflon), the material can be pushed and bent without
possibly still returning to nearly their original shape, or at
bending if a little too much force is introduced.

11.
Different materials used in watchmaking
• https://inside.code41watches.com/the-different-materials-used-in-
watchmaking

12.
Ten Steps of the Product Design
Process
• 1. Brainstorming:Definition of the problem. In particular, you
must announce the problem (in this case, the need to create the
“right” product design) and select participants for both teams.
• 2. Defining the Product:After brainstorming, when all the
viable ideas for the future product are chosen, you need to
highlight a certain number of general expectations
(requirements) for its implementation.
• 3. Conducting the User Research
• Research implies several aspects: market research to define
the presence of competitors, the definition of trends, the
assessment of the product’s prospective longevity, etc.

13.
• 4. Sketching
• Any large project with a significant budget will only benefit from
the creation of sketches. Before time is invested in finding
solutions, the direction of the search must be coordinated with
the client.
• 5. Prototyping
• :“skeleton” of the future product’s look
• 6. Compiling Specifications
It allows reviewing all the requirements for the finished product
and possible solutions in maximum detail. Also, these
specifications should contain the final delimitation of
responsibilities, deadlines, and costs.

14.
Materials selection
• During the development stage the final materials are often chosen for
their properties:
• Finish(aesthetics)
• Costs
• Availability
• Availability of equipment's for the design making.
• To have the skill to manufacture the specific part.

15.
Material testing
• Designers may test materials to establish if they are fit for purpose.
There is range of scientific testing include:
• Density test
• Heat/melting point test
• Tensile test
• Izod impact test
• Conductivity/insulation test
• Hardness test.

16.
ACTIVTY 1
• Research any two testing terms and explain how these testing useful
for material selection?
• (Students will present their ideas in the class)
• Group 1 and 6-Density/Heat melting point test
• Group 2 and 5-Tensile test /Izod impact test
• Group 3 and 4-Conductivity/insulation test.

17.
Activity 2-Plenary
• Group 1 and 6-List all materials and components that make up the
Coffee table with the appropriate design using 3D Builder.
• Group 2 and 4-List all the materials and components that make up
the Shoe rack with appropriate design using 3D Builder.
• Group 3 and 4- List all the materials and components that make up
the multipurpose storage cabinet with appropriate design using 3 D
builder.