Orthographic Projection

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By: uffabrew (12 month(s) ago)

Well done WAQQAS! Could you please send me a copy to use in the classroom? ed.ufford@rsd.edu

By: arun.kumbhar (23 month(s) ago)

Plz send me the presentation orthographic projection. My email ID is arun.kumbhar@gmail.com

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By: asati_sanjay (35 month(s) ago)

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By: dalgish (39 month(s) ago)

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Presentation Transcript

Slide 1: 

Orthographic Projection

Slide 2: 

TOPICS

Slide 3: 

OBJECT REPRESENTATION

Slide 4: 

MULTIVIEW PROJECTION Three principle dimensions of an object … … can be presented only two in each view. Adjacent view(s) is needed tofulfill the size description.

Slide 5: 

Revolve the object with respect to observer. TO OBTAIN MULTIVIEW REPRESENTATION OF AN OBJECT The observer move around the object.

Slide 6: 

REVOLVE THE OBJECT Front view Right side view Top view

Slide 7: 

OBSERVER MOVE AROUND Front view Right side view Top view

Slide 8: 

THE GLASS BOX CONCEPT Bottom view Left side view Rear view

Slide 10: 

Orthographic Writing

Slide 11: 

TOPICS

View Selection : 

View Selection

Slide 13: 

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.

Slide 14: 

STEP 1 : Orient the Object NO ! GOOD

Slide 15: 

STEP 2 : Select a Front View Inappropriate First choice GOOD Second choice Waste more space

Slide 16: 

Inappropriate STEP 2 : Select a Front View

Slide 17: 

STEP 2 : Select a Front View GOOD Inappropriate

Slide 18: 

STEP 3 : Select an Adjacent View GOOD Inappropriate Inappropriate GOOD

Slide 19: 

STEP 3 : Select an Adjacent View Necessary Necessary Hole’s location can be specified on the same view. Difficult to interprete. Easy to understand

Slide 20: 

STEP 3 : Select an Adjacent View POOR Not enough space for dimensioning.

Slide 21: 

STEP 3 : Select an Adjacent View GOOD

Slide 22: 

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

Slide 23: 

ONE-VIEW DRAWING Unnecessary These 2 views provide only informationabout the part thickness ! 1 Thick

Slide 24: 

ONE-VIEW DRAWING Unnecessary Repeat ! Infer from CL Unnecessary

Slide 25: 

TWO-VIEW DRAWING Repeat ! Unnecessary

Slide 26: 

TWO-VIEW DRAWING Unnecessary

Slide 27: 

TWO-VIEW DRAWING Unnecessary

Alignment of Views : 

Alignment of Views

Slide 29: 

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

Slide 30: 

ORTHOGRAPHIC PROJECTION 1st angle system 3rd angle system

Slide 31: 

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

Slide 32: 

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

Slide 33: 

First angle system Third angle system PROJECTION SYMBOLS

Slide 34: 

Orthographic Writing Steps

Slide 35: 

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

Slide 36: 

1. SELECT THE NECESSARY VIEWS

Slide 37: 

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

Slide 38: 

PROJECT THE VIEWS

Slide 39: 

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

Slide 40: 

TRANSFERING THE DEPTH DIMENSION 1. Direct measurement

Slide 41: 

TRANSFERING THE DEPTH DIMENSION 2. Use miter line

Basic Dimensioning : 

Basic Dimensioning

Slide 43: 

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

Slide 45: 

TANGENT & INTERSECTION

Slide 46: 

TANGENT & INTERSECTION

Slide 47: 

TANGENT & INTERSECTION

DIFFERENCE BETWEEN FIRST AND THIRD ANGLE PROJECTIONS : 

DIFFERENCE BETWEEN FIRST AND THIRD ANGLE PROJECTIONS Object is kept in the first quadrant Object lies between observer and the plane of projection The plane of projection is assumed to be Non-transparent Front (elevation) view is drawn above the XY line Object is assumed to be kept in the third quadrant Plane of projection lies between the observer and the object. The plane of projection is assumed to be transparent Front view is drawn below the XY line.

DIFFERENCE BETWEEN FIRST AND THIRD ANGLE PROJECTIONS : 

DIFFERENCE BETWEEN FIRST AND THIRD ANGLE PROJECTIONS Top (Plan) view is drawn below the XY line Left view is projected on the right plane and vise versa Followed in India, European countries Top (plan) view is drawn above the XY line Left view is projected on the left plane itself Followed in USA

Slide 50: 

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

Slide 51: 

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

Slide 52: 

PROJECTION OF OBJECT The views are obtained by projecting all object features to the picture plane. You have to project the remaining surfaces which are invisible too !

Slide 53: 

PROJECTION OF OBJECT

Slide 54: 

PROJECTION OF OBJECT

Slide 55: 

Line Convention

Slide 56: 

LINE CONVENTION

Slide 57: 

PRECEDENCE OF LINE Visible line Order of importance Hidden line Center line

Slide 58: 

HIDDEN LINE PRACTICE Correct No ! Join Leave space

Slide 59: 

Correct No ! Leave space Leave space HIDDEN LINE PRACTICE

Slide 60: 

Correct No ! L T HIDDEN LINE PRACTICE

Slide 61: 

HIDDEN LINE PRACTICE

Slide 62: 

CENTER LINE PRACTICE

Slide 63: 

CENTER LINE PRACTICE