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BDA 20502

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Chapter 1

Intro - 3D TermsCoordinate System

Started with 3DUCS

Orthographic view

Intro - 3D Terms

Wireframe Model:

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Intro - 3D Terms

Surface Model:

Intro - 3D Terms

Solid Model:

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AutoCAD 2009

RIBBON

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Coordinate System and Snaps ApplicationAbsolute coordinatesRelative coordinatesDirect distance entry

Objects snap

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Coordinate Systems

AutoCAD uses the following coordinate systems to locate a point in an XY plane.

1. Absolute coordinates2. Relative coordinates

- Relative rectangular coordinates- Relative polar coordinates

3. Direct distance entry

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Coordinate Systems

• Absolute coordinates- points are located with respect to the origin (0,0)

Command: Line

(10,10) (50,10)

(10,50) (50,50)

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Coordinate Systems

• Relative rectangular coordinates- the displacements along X,Y axes are measured with reference to the previous point rather than to the origin (0,0)

Command: Line (@0,50)(@-50,0)

(@0,-50)(@50,0)

(10,10)

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Coordinate Systems

• Relative polar coordinates- defining both the distance of the point from current point and the angle

Command: Line

(@50<30)

(10,10)

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Coordinate Systems

• Direct distance entry- the direction is determined by the position of the cursor

Command: Line

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Snap Application• Object snaps (OSNAP) - to improve

performance/accuracy and make drafting simpler• Keyboard Shortcut ON/OFF: F3 • Command: OSNAP

Snap Application

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• OSNAP Overrides- Use SHIFT + Right-click and select the object snap from the shortcut menu

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Started with 3D

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Started with 3D

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UCS

World Coordinate System (WCS)• Fixed origin (0,0,0) located at the lower left corner by

default and cannot be removed.• WCS is generally used in 2D drawings, wireframe

models and surface models.

Why UCS?make easier in create a feature.UCS allows to relocate and reorient the origin depends to user, mostly used in 3D.

UCSConventions in AutoCAD- ‘Right-hand rule’ – identify the X,Y,Z axes direction.

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‘Right-hand thumb rule’- Identify the direction of rotation in 3D space.

UCS

1. Toolbar

2. Command : UCS

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UCSUCSICON (2 methods)1. Menu : View > Display > UCS Icon2. Command : UCSICON

Select “properties”

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Orthographic View

• Understandings X, Y and Z axes

• XY, YZ, XZ Plane

x

Z

Y

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Activities• Construct 3D Wireframe Model

Guide:• Use line Command• Ortho ON • Work on XY plane