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Advanced Sketch Tools. Mirror Entities. Need to have an axis to mirror about. Need to determine axis of symmetry. Copy. Need to pick a ‘start point’ on the selected entities The ‘start point’ is the reference point for those entities. Rotate. Scale. Move. Linear Pattern.

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Advanced Sketch Tools

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Advanced Sketch Tools


Mirror Entities

  • Need to have an axis to mirror about


Need to determine axis of symmetry


Copy

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

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


Rotate


Scale


Move


Linear Pattern


Circular Pattern


Defining New Sketch Plane

Insert >> Reference Geometry >> Plane

  • Need up to 3 references for the plane


Info for a plane

1 Point

1 Line

3 Points

1 Line

1 Edge

(in the same plane)


Info for a plane

Parallel Plane:

  • Choose 1 reference face

  • Choose 1 offset point/vertex

    Plane at an Angle:

  • 1 reference face – choose ‘at angle’

  • 1 axis or rotation


Info for a plane

Offset Distance:

  • 1 Plane – Choose ‘offset distance’

    Perpendicular to:

  • 1 sketch entity

  • 1 point


Info for a plane

Tangent To:

  • 1 non-planar face

  • 1 point on the edge of that face


PROJECTION THEORY


Understanding Projections

Projection:

  • A “VIEW” of an object

  • Intended to be shown on a PLANE


Multi-View Projection


Visualization

18


Edges and Vertices

19


Edge View of a Surface

20


True-Size View of Surface

21


Foreshortened View of Surface

22


Normal Surfaces

23


Inclined Surfaces

24


Oblique Surfaces

25


Edges (1)

26


Edges (2)

27


Edges (3)

28


VIEWS of OBJECTS


Principal Dimensions


Revolving an Object


Revolving an Object

32


The Six Standard Views


The Six Standard Views


Necessary Views


Two Necessary Views


Two Necessary Views


One Necessary View


One Necessary View


Orthographic Projection(3rd Angle Projection)

40


Projection of an Object

41


Projection Method

42


Top View

43


Right-Side View

44


The Glass Box

45


The Glass Box

46


Unfolding the Box

47


Unfolding the Box (2)

48


Unfolding the Box (3)

49


Meaning of Lines


Folding Lines


Transferring Depth Dimensions


Projecting a Third View (1)


Projecting a Third View (2)


Projecting a Third View (3)


Projecting a Third View (4)


Projecting a Third View (5)


Alignment of Views

58


Alternative Positions of Views


Parallel Edges


Angles


Similar Shapes of Surfaces


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


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


First-angle Projection


Model Items


Smart Dim


Example 1


Example 2


Example 2


Example 3


Example 3


Example 4


Example 5


Example 5


Example 5


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