Transcript CAD/CAM - Springburn Academy

Product Design
CAD/CAM
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Getting Started presentation.
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Learning objectives
Learning objectives
To understand that computers now play a major
role in developing and testing new products within
product design.
To be able to use CAD software to create 2D and
3D designs.
To recognize the advantages and disadvantages of
CAD and CAM.
To know how CNC machines are programmed and
to be familiar with a range of CNC machines
including milling machines, routers and cutters.
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Computer aided draughting
When computers were first used by product designers,
software was developed that enabled them to draw
products.
These products ranged from architectural models to car
components. The main purpose of these drawings was
for engineers and manufacturers to have the
necessary information to make the product.
Drawing packages enabled
designers to quickly convert
hand drawings of products into
an electronic format for safer
storage and easier
communication. This is called
computer aided draughting
(drawing).
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Computer aided designing
Computer aided draughting led software engineers to
create computer packages for product designers which
would enable them to create designs, rather than just
draw diagrams.
Special tools and functions were developed so that
designers could quickly create and change the features
of a design.
Various types of CAD software
emerged, enabling designers to
create and develop designs in
2D and 3D forms within an
electronic environment.
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Computer aided testing
Once product designers were able to create and develop
products in an electronic format, they realized the great
benefits this brought.
Software engineers began to further develop the product
information to give it mass and volume, enabling product
designers to imitate various materials and conditions
under which the product would function.
This led to product testing. Product designers can now
conceive, develop and test a product with a very short
lead time. We can see products actually working before
they are even made. This has reduced the cost of
developing new products.
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Conventional CAD packages
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Types of CAD
Two-dimensional (2D)
Create simple shapes in the X and Y directions.
Does not show the Z direction (depth).
Can be used for drawing, pattern draughting and for drawing
images that appear to have three dimensions but are still in
a 2D format.
3D modelling
Creates shapes in three dimensions (x, y and z).
Uses intuitive tools such as dimensioning, extruding and
rounding edges to create wireframe and solid models.
Wireframe models show the product as a coat hanger
model with no solid surfaces, so the features behind and on
the rear of the product are visible.
Solid modelling shows the product with a skin over the top
of the wireframe. Solid models are easier to visualize
because they look like the real product.
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Photo realistic rendering
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Advantages and disadvantages of CAD
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Computer aided manufacturing
Computer aided manufacturing (CAM) uses a computer to
control manufacturing machinery. When combined with CAD,
computer aided manufacturing is a very useful production
process.
CAD/CAM is the process of linking computers used to aid
design with computers used to aid manufacture.
A CAD drawing is essentially visual information. When this
information is changed into numerical data to control the
operation of a machine, it is called computer numerical
control – C.N.C.
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Computer aided manufacturing
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Advantages & disadvantages of CAM
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