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Technological Design Sketching
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Why Draw ? Universal Language or the Language of Industry
“A Picture is worth 1000 words”
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Line Types Construction Object Hidden used to build the drawings
very light solid line ________ Object used to show the object thicker, darker solid line _______ Hidden used to show hidden features of an object thin dark dashed line _ _ _ _ _ _ _ _
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Center lines A center line represents an axis of symmetry ___ _ ___
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Sketching Created freehand Must be done neat and clear
use proper perspective Must be done quickly and efficiently
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“it is directly proportional to the actual object”
Drawings & Scale Draw an object to scale….. “it is directly proportional to the actual object” Scale: 1 : 1 Is proportional to 1 Unit of Actual Object 1 Unit on Paper
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DRAWING IS 10 TIMES SMALLER THAN THE OBJECT
Reduced Scale Scale: 1 : 10 Is proportional to 10 Unit of Actual Object 1 Unit on Paper DRAWING IS 10 TIMES SMALLER THAN THE OBJECT
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DRAWING IS 10 TIMES LARGER THAN THE OBJECT
Enlarged Scale Scale: 10 : 1 Is proportional to 1 Unit of Actual Object 10 Unit on Paper DRAWING IS 10 TIMES LARGER THAN THE OBJECT
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Hand drawing – Sketching to scale
Plan your use of space Choose the appropriate scale Use the grid on the paper to draw to scale Label the drawing clearly using good hand lettering skills
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Sketching to scale–Basic steps
Build a frame
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Sketching to scale–Basic steps
Block in overall sizes for each detail
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Sketching to scale–Basic steps
Add the details
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Sketching to scale–Basic steps
Darken the lines
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Spacing the Views Draw the views so that they are balanced on the drawing paper Avoid crowding or excessive space
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6-4 Hidden Surfaces and Edges
Drawing hidden lines
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Technique Circles 1 2 3 4 5 6
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