Download - Computer Aided Draughting
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1CAD Overview
(Computer Aided Draughting/Design)
Creation of 3D virtual models
Creation of 2D drawings
Creation of 2D drawings from 3D models
Simulation of behaviour
Simulation of real life appearance
Assist in manufacture
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2CAD Advantages
Easier creation and correction of drawings
Better visualisation of drawings
Quick and convenient design analysis
Simulation and testing of designs (stress)
Increased accuracy
Improved filing system of the drawing (Harddisk)
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3CAD Overview
3D- Wire frame
3D- Surface
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4CAD Overview
3D- Solid modelling
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5CAD Overview
3D- Solid modelling Behaviour in real life
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6 SolidWorks is design automation software.
In SolidWorks, you sketch ideas and experiment with different
designs to create 3D models.
SolidWorks is used by students, designers, engineers, and other
professionals to produce simple and complex parts, assemblies,
and drawings.
CAD SolidWorks
What is SolidWorks?
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7CAD SolidWorks
Benefits of solid modelling:
Solid modelling enjoys many benefits not offered by 2D design methods
The solid model has a volume and surfaces.
The solid model can easily be analysed for its physical properties, such as
volume, mass, surface area, cross sectional areas, location of center of mass,
moments of inertia, etc.
The 3D environment offers excellent visualisation of the design as a shaded
solid, with texture and colour, or as a wire framed representation.
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8 SolidWorks is a fully parametric CAD program.
CAD SolidWorks
Introduction:
This means that when a part is designed and modeled dimensions are
assigned which define the part. If, at a later time, these dimensions are found
to be unsuitable they can be easily changed and the modification will filter
through the system wherever the part appears.
This is particularly helpful when dealing with an assembly since, if a
modification is made to a single part, the modification is carried throughout
the assembly.
A designer can also define relationships between parts. For example, in an
engine, if the diameter of the piston is increased or decreased, the
corresponding engine block can be defined such that it is automatically
modified to match the specifications of the modified piston.
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9In engineering terms an assembly is made up of a number of parts.
Similarly, in SolidWorks speak, a part is made up of a number of
features.
A feature is a discrete element such as a hole, a chamfer, or a fillet.
Features are either Sketched (as a 2D outline which is then moved
through space to produce the desired 3D result) or Applied (directly
on to the model via a specific software function).
Sketched features tend to be major items of geometry such as holes,
bosses and cuts. Applied features are (typically) secondary items
such as chamfers and fillets.
CAD SolidWorks
Feature-based models:
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The SolidWorks Model:
The SolidWorks model is made up of:
Parts
Assemblies
Drawings
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CAD SolidWorks
Inside edge (concave fillet) adds material.
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CAD SolidWorks
Principles of Operation:
Everything starts from a 2D sketch, the initial base feature is created by
moving this sketch through space to create a 3D form. This is done in
one of four ways:
Extruding;
Revolving;
Sweeping or
Lofting.
Over the next few pages these terms are examined in greater detail.
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CAD SolidWorks
Revolve
By defining an axis of rotation within
the initial sketch the outline can be
revolved to create a feature as shown
opposite. Revolved base features are
ideal for cylindrical components that
have a specific profile.
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CAD SolidWorks
Sweep
Sweeping involves the production of two
sketches at an angle to one another. One
acts as the profile and is swept along the
other, which is defined as the path.
Sweeps are particularly good for piping
type features such as the tubular chair
frame.
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CAD SolidWorks
Lofting
Lofting involves the production of a
number of sketches on separate
planes. These sketches are then
lofted together to form a solid body.
Lofting is a powerful and potentially
complex modelling technique and
tends to be reserved for highly
sculptural forms such as in aircraft
body.
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CAD SolidWorks
Get Modelling!
Reading about software (or even listening to a lecture on its finer points!)
is definitely not the way to get to grips with it; get modelling! During the
lab sessions we will cover a number of exercises, starting with
SolidWorks own excellent built-in tutorials. If you want to become a
really good SolidWorks user, look around for an item and have a go at
modelling it. Start with something simple and build up to more complex
things. You might struggle a bit at first, but the effort is well worth it.
Go to website http://www.tech.plym.ac.uk/sme/dsgn131/
And follow the instructions for tutorial.
Happpy SolidWorking!