mechanical drawing. why do we draw? to communicate!!!
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MECHANICAL DRAWINGMECHANICAL DRAWING
Why do we draw?Why do we draw?
To communicate!!!To communicate!!!
Why does it matter?Why does it matter?What’s the use of a great What’s the use of a great idea if you cant convey it to idea if you cant convey it to any one else.any one else.
No one is an expert at No one is an expert at everything, so we must everything, so we must collaborate to reach a collaborate to reach a common goal.common goal.
Communication with Communication with DrawingDrawing
(things to consider)(things to consider)Subject – what you are trying to
convey (Process, structure, function,
material, etc….)
Audience – who you are communicating with
(designer, client, manager, public, other engineers)
Types of Mechanical Types of Mechanical DrawingDrawingDrawing types we will explore
today◦Sketches◦Isometric Drawings◦Orthographic Projections
When is a sketch useful?When is a sketch useful?
Think about◦What (subject)◦Who (audience)
SketchinSketchingg
– – look and feellook and feel
SketchiSketchingng
– – to show to show processprocess
SketchinSketchingg
– – to explore formto explore form
When is a technical drawing When is a technical drawing useful?useful?
Think about◦What (subject)◦Who (audience)
Technical Drawing - Technical Drawing - IsometricIsometric
Technical Drawing – Technical Drawing – Orthographic Orthographic
Technical Drawing – Technical Drawing – Assembly sectionAssembly section
Technical Drawing – More Technical Drawing – More SectionsSections
Isometric DrawingIsometric Drawing
Isometric DrawingIsometric Drawing
Isometric DrawingIsometric Drawingfront corner is
centered and vertical
bottom edges slant up at a 30 degree angle from horizontal
(You should be viewing 3 of the 6 faces of a cube)
30° 30°
ISOMETRIC DRAWINGISOMETRIC DRAWINGheight (“vertical”) lines are
always drawn vertically in at their true (or scaled) length
width and depth (“horizontal”) lines are drawn 30 degrees from the horizontal at their true (or scaled) length
all lines parallel to the height, width or depth are at their true (or scaled) length
lines not parallel to these axes are not drawn at their true length
height
width depth
Isometric Drawing - Isometric Drawing - DimensionsDimensions
Isometric Drawing - Isometric Drawing - DimensionsDimensions
Identify line to dimension
Isometric Drawing - Isometric Drawing - DimensionsDimensions
Draw extension lines
Isometric Drawing - Isometric Drawing - DimensionsDimensions
Draw dimension lines
Isometric Drawing - Isometric Drawing - DimensionsDimensions
draw as many dimensions as you would need to make the part (no more no less)
did anyone have an object did anyone have an object that couldn’t be fully that couldn’t be fully expressed with a single expressed with a single isometric drawing?isometric drawing?
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
Isometric Drawing
Orthographic Projection
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC PROJECTIONORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC DRAWING – ORTHOGRAPHIC DRAWING – PLANNING PLANNING
what is the minimum number of views required to capture every object feature? often the answer is three, but it could be less or more!
what is the best way to lay out these drawings ◦ best use of paper, should drawings be scaled up or
down?we will be dimensioning drawings, so
leave enough space around each view to add dimensions
think about the order of inking to avoid smudging
ORTHOGRAPHIC DRAWING – ORTHOGRAPHIC DRAWING – LINEWEIGHTS AND STYLESLINEWEIGHTS AND STYLES thick continuous line – used for
visible edges and outlines
thin continuous line – hatching, short center lines, dimensions or projection lines
thin dash-dot line – center lines, to identify the center of a circle or a line of symmetry
thin dashed line – used for important hidden detail, such a hole in a solid or a wall thickness
How do I bring this to the How do I bring this to the classroom??????classroom??????Use sketching for general design,
planning and idea sharing◦Look and feel◦Form ◦process
Use technical drawing for final details such as assembly or part drawings for fabrication◦Isometric◦Orthographic◦Assembly
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