Chapter 04 Orthographic writing

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Chapter 4 Orthographic Writing

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TOPICS Views selection Orthographic writing steps Alignment of views Tangency and intersections Basic dimensioning

View Selection:

View Selection

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VIEW SELECTION STEPS 1. Orient the object to the best position relative to a glass box. 2. Select the front view. 3. Select adjacent views.

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STEP 1 : Orient the Object The object should be placed in its natural position . NO ! The object should presents its features in actual size and shape in orthographic views. GOOD

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STEP 2 : Select a Front View The object’s longest dimension should be presented as a width . Inappropriate First choice GOOD Second choice Waste more space

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Inappropriate The adjacent views that are projected from the selected front view should appear in its natural position. STEP 2 : Select a Front View

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STEP 2 : Select a Front View Choose the view that have the fewest number of hidden lines . GOOD Inappropriate

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STEP 3 : Select an Adjacent View GOOD Inappropriate Inappropriate GOOD Choose the view that have the fewest number of hidden lines.

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Choose the minimum number of views that can represent the major features of the object. STEP 3 : Select an Adjacent View Necessary Necessary Hole’s location can be specified on the same view. Difficult to interprete. Easy to understand

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Choose the views that are suitable to a drawing space. STEP 3 : Select an Adjacent View POOR Not enough space for dimensioning.

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Choose the views that are suitable to a drawing space. STEP 3 : Select an Adjacent View GOOD

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Example : View selection Shape description Size description F.V. W D  W H  D mislead to…     F.V. & T.V. Three views F.V. & R.S.V. H

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ONE-VIEW DRAWING Flat part having a uniform thickness. Unnecessary These 2 views provide only information about the part thickness ! 1 Thick

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ONE-VIEW DRAWING Cylindrical-shaped part. Unnecessary Repeat ! Infer from CL Unnecessary

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TWO-VIEW DRAWING There exists an identical view. Repeat ! Unnecessary

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The 3 rd view has no significant contours of the object. TWO-VIEW DRAWING Unnecessary

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TWO-VIEW DRAWING Unnecessary The 3 rd view has no significant contours of the object.

Alignment of Views:

Alignment of Views

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PROJECTION SYSTEMS 1. First angle system 2. Third angle system First Quadrant Third Quadrant - European country - ISO standard - Canada, USA, Japan, Thailand

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ORTHOGRAPHIC PROJECTION 1 st angle system 3 rd angle system

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ORTHOGRAPHIC VIEWS 1 st angle system 3 rd angle system Folding line Folding line Folding line Folding line  

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ORTHOGRAPHIC VIEWS 1 st angle system 3 rd angle system Front View Front View Right Side View Right Side View Top View Top View

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First angle system Third angle system PROJECTION SYMBOLS

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PROJECTION SYMBOLS d 1.7 d 2.2 d Suggested proportion

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Orthographic Writing Steps

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WRITING STEPS 1. Select the necessary views 2. Layout the views. 3. Project the views. 4. Dimension the views.

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FRONT TOP 1. SELECT THE NECESSARY VIEWS

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45 152 152 64 2. LAYOUT THE VIEWS A4 25 Choose an appropriate scale 1:1

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PROJECT THE VIEWS

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DIMENSION THE VIEWS NOTES 1. Dimensions in millimeters. 2. …. PART NAME x x x x y y y y z

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TRANSFERING THE DEPTH DIMENSION 1. Direct measurement 0 1 2 3 27 0 1 2 3 Starting point 27

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TRANSFERING THE DEPTH DIMENSION 2. Use miter line 45  Views too close

Basic Dimensioning:

Basic Dimensioning

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1. Extension lines 2. Dimension lines 3. Leader lines 4. Dimension numbers 5. Local notes COMPONENTS 10 27 43 10 Drill, 2 Holes R16 17

Tangencies and Intersections:

Tangencies and Intersections

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No line is formed when curved surface tangent to a plane surface. No line No line TANGENT & INTERSECTION Line is formed when curved surface intersects a plane surface. tangent tangent intersect intersect

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TANGENT & INTERSECTION intersect tangent tangent tangent plane limiting element

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TANGENT & INTERSECTION intersect No line tangent tangent tangent tangent tangent No line tangent No line

QUIZ:

QUIZ

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1. Which should be the natural position of the light bulb ? (20 sec) c) b) a d) 5 10 15 20 0

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A B C D E F 2. Which are the necessary views ? (60 sec) A-C-E E-B-D E-A E-C 15 30 45 60 0

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3. Which is in correct first angle projection ? (180 sec) a) b) c) d) 45 90 135 180 0

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4. Which is in correct third angle projection ? (180 sec) a) b) c) d) 45 90 135 180 0

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5. Which is a wrong 3 rd angle orthographic views ? (180 sec) 45 90 135 180 0 a) b) c) d)

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