logging in or signing up Orthographic Projection waqqas Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 5924 Category: Education License: All Rights Reserved Like it (10) Dislike it (0) Added: January 30, 2010 This Presentation is Public Favorites: 8 Presentation Description No description available. Comments Posting comment... By: uffabrew (5 month(s) ago) Well done WAQQAS! Could you please send me a copy to use in the classroom? firstname.lastname@example.org Saving..... Post Reply Close Saving..... Edit Comment Close By: arun.kumbhar (16 month(s) ago) Plz send me the presentation orthographic projection. My email ID is email@example.com Saving..... Post Reply Close Saving..... Edit Comment Close By: shahrulcheon (20 month(s) ago) hi. great presentation. Could you share this ppt with me please? Please send to firstname.lastname@example.org. Thanks Saving..... Post Reply Close Saving..... Edit Comment Close By: asati_sanjay (27 month(s) ago) pl send me the ppt at email@example.com Saving..... Post Reply Close Saving..... Edit Comment Close By: dalgish (32 month(s) ago) very nice ppt, could you send me a copy on firstname.lastname@example.org please. thanks Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member 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 You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.