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# Orthographics in AutoCAD - PowerPoint PPT Presentation

Orthographics in AutoCAD. Class 3.2: Multi-view Drawings. R eadiness A ssessment T est 3.2.1. As a team, respond to the following question. You will be given 2 minutes: Name the six principal orthographic views. Learning Objectives.

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Presentation Transcript

Class 3.2: Multi-view Drawings

• As a team, respond to the following question. You will be given 2 minutes:
• Name the six principal orthographic views.
Learning Objectives
• Name the three principle projection planes and the dimensions that each one shows
• Use AutoCAD to create orthographic views of objects
• Know the correct line weights for printing drawings from AutoCAD
Orthographic Projection
• 2 Dimensional projections on Orthogonal planes
• Show lines based on change of plane or change of material
• Use multiple linetypes
• Visible
• Hidden
• Center
Describing a “Step Wedge”
• A relatively simple object
• Pictorial view may be difficult
Glass Box Concept
• Envision the object surrounded by a glass box
• Project the views out onto the glass panes
• Each pane shows a 2D projection of the object
Projection Planes
• The three panes of glass represent the principal orthographic planes
• Horizontal
• Frontal
• Profile
• Each plane illustrates two of the principal dimensions of:

HEIGHT, WIDTH or DEPTH

• Individually respond to the following question. You will be given 1 minute:
• Name the six principal orthographic views and the dimensions each shows.
Class Exercise
• As a team you have 3 minutes to discuss the following:
• What dimensions are contained on each of the principal projection planes?
Converting to Orthographics
• By unfolding the box, you generate the FRONT, TOP, and RIGHT SIDE views
• Others (Back, Bottom, Left Side) could also be created if needed
Choice of Orthographic Views
• If the object has an obvious top, then it must be the top view
• Minimize the number of hidden lines
• Use the most descriptive view as the front view
• Conserve space by choosing the depth to be the smallest dimension
Linetypes
• Visible (0.6 mm)
• Hidden (0.3 mm)
• Center (0.3 mm)
• Construction (0)
Precedence of Lines
• When lines coincide with each other, the more important lines take precedence over the other lines. The order of precedence is:
• Visible
• Hidden
• Center
Paired Exercise
• Sketch three orthographic views of the object shown on the next slide.
• Include visible, hidden, and centerlines where appropriate.
Drawing setup

SNAP

GRID

Display control

ZOOM

PAN

Drawing

LINE

DTEXT

CIRCLE

ARC

Editing and inquiry

ERASE

DDEDIT

TRIM

FILLET

UNDO

Modify properties

Grips

General Concepts

Layers

Ortho Mode

• Log on to the network
• Double click on AutoCAD icon
• Select Use a Template
• Find drawing templateE09C.dwt
• Select OK
Status line at the bottom
• The status line at the bottom of the display tells you whether any of the modes are on or off.
• The “pressed” modes are on. (SNAP, GRID, ORTHO and MODEL in the picture below)
• These are saved with the computer, so if your drawing does not have the correct modes selected, please modify the choices as shown below.
Working with Layers
• Layers are used to control the type of line that will be drawn
• They are pre-defined on the templates used for this class
• They are accessed from a dropdown list as shown to the right
Display Control
• ZOOM -- scales the screen view to an area of the drawing surface
• “Window” will zoom down to a window
• “All” will zoom out to show the larger of the drawn entities or limits
• Realtime allows you to shrink or enlarge the display in real time.
• PAN -- moves around on the drawing surface
Drawing Objects

Line

• Drawing commands are found on the toolbar located at the left of the screen
• The four of interest today are Line, Arc, Circle, and Mtext
• These may be abbreviated from the keyboard using the first letter(s) (e.g.)
• Line - L
• Arc - A
• Circle - C
• Mtext - MT

Arc

Circle

Mtext

Completing the Title Strip
• Rather than using the MTEXT command to compete the title block, it is simpler to edit the existing text.
• The command to do this is DDEDIT, or find “Text…” under the Modify pulldown menu.
• Or you can double click on the text to be edited.
Formats of Keyboard Coordinates
• Either absolute or relative
• Absolute -- references origin of drawing (0,0)
• Relative -- references previously selected point
• Absolute is the default
• Precede relative coordinates with an @ sign
• @10,20 or @ 10<45
• Direct Distance
• Enter a distance in the direction of the cursor and return
Paired Exercise
• Start a new drawing.
• Use template E09c.dwt
• You have 15 minutes to complete as many of the drawings as possible
• Save your solutions on a floppy disk.