Advanced Sketch Tools

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Mirror Entities

• Need to have an axis to mirror about

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Need to determine axis of symmetry

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Copy

• Need to pick a ‘start point’ on the selected entities

• The ‘start point’ is the reference point for those entities

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Rotate

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Scale

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Move

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Linear Pattern

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Circular Pattern

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Defining New Sketch PlaneInsert >> Reference Geometry >> Plane• Need up to 3 references for the

plane

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Info for a plane• 1 Point• 1 Line

• 3 Points

• 1 Line• 1 Edge(in the same plane)

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Info for a planeParallel Plane:• Choose 1 reference face• Choose 1 offset point/vertexPlane at an Angle:• 1 reference face – choose ‘at angle’• 1 axis or rotation

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Info for a planeOffset Distance:• 1 Plane – Choose ‘offset distance’ Perpendicular to:• 1 sketch entity• 1 point

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Info for a planeTangent To:• 1 non-planar face• 1 point on the edge of that face

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PROJECTION THEORY

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Understanding Projections

Projection:–A “VIEW” of an object

–Intended to be shown on a PLANE

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Multi-View Projection

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Visualization

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Edges and Vertices

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Edge View of a Surface

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True-Size View of Surface

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Foreshortened View of Surface

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Normal Surfaces

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Inclined Surfaces

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Oblique Surfaces

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Edges (1)

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Edges (2)

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Edges (3)

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VIEWS of OBJECTS

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Principal Dimensions

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Revolving an Object

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Revolving an Object

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The Six Standard Views

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The Six Standard Views

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Necessary Views

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Two Necessary Views

Two Necessary Views

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One Necessary View

One Necessary View

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Orthographic Projection(3rd Angle

Projection)

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Projection of an Object

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Projection Method

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Top View

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Right-Side View

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The Glass Box

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The Glass Box

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Unfolding the Box

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Unfolding the Box (2)

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Unfolding the Box (3)

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Meaning of Lines

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Folding Lines

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Transferring Depth Dimensions

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Projecting a Third View (1)

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Projecting a Third View (2)

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Projecting a Third View (3)

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Projecting a Third View (4)

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Projecting a Third View (5)

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Alignment of Views

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Alternative Positions of Views

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Parallel Edges

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Angles

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Similar Shapes of Surfaces

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Interpreting Views• One method of interpreting sketches

is to reverse the mental process used in projecting them

• Each view provides certain definite information about the shape of the object and all are necessary to visualize it completely

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First- and Third-Angle Projection

• There are two main systems used for projecting and unfolding the views:– Third-angle projection which is used in

the United States, Canada and some other countries

– First-angle projection which is primarily used in Europe and Asia

• You should understand both methods

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First-angle Projection

Model Items

Smart Dim

Example 1

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Example 2

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Example 2

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Example 3

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Example 3

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Example 4

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Example 5

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Example 5

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Example 5

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