Advanced Cmds Two - Engineering Design Graphics - Lecture Slides, Slides of Computer-Aided Design for Engineers

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AutoCAD

Advanced Cmds-

Learning Goals

• Use the ACAD “Osap” tools to facilitate point

selection

• Use ACAD “Grips” to facilitate entity

modification

• Create and Use ACAD “Blocks”
• Create & Modify ACAD “Layers”
• Use Geometric Construction to Bisect a Line or

an Angle

Layers Concept

• Basically, layers are the computer equivalent

of TRACING OVERLAYS on a drawing board

• A Drawing can Have MANY Layers
  • Could be up to one for EACH Part
• You can control the Visibility , Color and

Linetype of layers independently

• These Three Properties form a ShortHand for line meaning

Layer Utility

• Layers are effectively a way of ordering a

CAD drawing

• e.g.; You could create a layer called "Construction" and use this for your construction lines. When the drawing is complete, you could simply TURN OFF this layer off so that it can't be seen
• Good & Consistent use of layers is the

MOST Important aspect of good CAD

drawing practice

Standard Lines

• Line Patterns Communicate What The Line Represents In The Drawing
• Line Patterns Tell You Information Such As Whether The Line Is Hidden, Visible, Or A Centerline
• Line Precedence:
  • Visible → Hidden → Center

Visible line Hidden line Hatching Centerline Dimension Extension Leader Cutting Plane Viewing Plane

Short break Long break Phantom Stitch Chain

Layers By Line-Type

One FUNCTIONAL Layer

Layers by Part or Component

Make A Layer

• Let’s Make a New Layer for HIDDEN LINES
• Color → Red
• LineType → Hidden (Evenly Spaced Dashes)
• LineWidth → ACAD default

1. Start at new acad.dwt Drawing 2. Activate Format Layer Dialog Box

Make A Layer cont

7. Select Linetype (^) 8. Don’t See the “Hidden” type so click Load → DB

• Activates the Loaded Linetypes Dialog Box (DB)
• Find HIDDEN; click OK

Make A Layer cont

9. With Hidden Loaded, Pick it from Select Linetype DB 10. Rt-Click on Status Column and Select Current

• Click OK

Draw with Hidden Layer

Draw on Different Layer

• Start with “OBJ” layer
  • Draw a Nice Circle
• Activate Layer PullDown on the Layers ToolBar

 Click on the “DIM” Layer to make it the “ Current ” Layer

Entities on Different Layers

Move Entity to Different Layer

• Lets Move the Circle to the “PHANTOM” Layer
• Click to Circle to activate the Grips

 With the Handles Active PullDown the Layer-Status Menu  Click on “PHANTOM”