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TRANSCRIPT
Communicating Ideas
Graphically
• Sketching
– Characteristics
• Quick
• No tools required
• Graphic (visual)
Communicating Ideas
Graphically
• Methods for sketching lines
– Mark endpoints
– Sketch short, light lines (keep eye on
endpoint, not pencil point)
– Darken line in one continuous movement
(keep eye on pencil point)
Orthographic Projection Notes
• Engineers use sketching to
communicate ideas with detail
• Drawings are used to produce models
and prototypes
Communicating Ideas
Graphically
• Orthographic Projection
– Also called - Multi-view sketching
– Each side of the object is projected on a
flat plane
Communicating Ideas
Graphically
Multi-view Drawing • Always in this format: Draw this
• All details should be shown in these three views
• Height, width, and depth should be consistent in all views
Front View
Top View
Right Side View
Multi-view Drawing Alphabet of Lines
• Construction Line – Thin & faint; used to start
drawing (box-in lines)
• Object Line – Darker & thicker; show outlines of
features
• Hidden Feature Line – Short & evenly spaced
dashes; makes hidden features visible on
drawing
• Centerline – Alternating long and short dashes;
shows the center of holes
• Extension Line – Thin; shows size of object and
parts
Multi-view Drawing
Steps
• Block in the front, top, and right side views – Use faint construction lines
– Allow room in between each view for dimensioning
– Use extension lines to keep Depth, Width, and Height consistent
• Add detail and draw features – Use faint construction lines
– Use extension lines to maintain position of features
• Finish Drawing – Strengthen object lines
– Erase construction lines
30°
• Quick way to share an idea
• Isometric paper has a grid of vertical lines and lines
that are 30° to the horizontal
• Shows object with one view that shows as much
detail as possible
Isometric Sketching Notes
Isometric Sketching Steps
• Draw front edge of the box
• Draw bottom edges of the box
– These are the 3 isometric axes
• Add dimensions to the axes
• Draw the other two vertical edges of the box
• Draw the top edges
• Add details
• Remove unnecessary construction lines
Use Construction Lines
7 squares
10 squares
6 squares
Isometric Sketching Steps
• Draw front edge of the block
• Draw bottom edges of the box
– These are the 3 isometric axes
• Add dimensions to the axes
• Draw the other two vertical edges of the box
• Draw the top edges
• Add details
• Remove unnecessary construction lines
DONE