Week 4_MIET2461_Orthographic Projection_Multiviews.pdf - MIET 2461 Biomedical CAD — Week 4 Orthographic projection by Dr Toh Yen Pang

Week 4_MIET2461_Orthographic Projection_Multiviews.pdf -...

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1 Week 4 by: Dr. Toh Yen Pang [email protected] 9925 6128 B251.3.22 MIET 2461 Biomedical CAD Orthographic projection
2 Objectives 3-D Viewing Techniques Explain orthographic and multiview projection Projection theory
3 1 2 3 5 6 4 7 A3 1 2 3 4 5 6 7 8 A B C D E F A B C D E F Week 5 - Exercise 3 DESIGNED BY: ... DATE: ... QUANTITY: 1 Off CHECKED BY: TPE DATE: THIRD ANGLE PROJECTION SCALE: 1:1 1/1 SHEET: DOCUMENT TITLE: GENERAL TOLERANCE ISO 2768 - mK LINEAR DIMENSIONS 0.5<t 3 0.1 3<t 6 0.1 6<t 30 0.2 30<t 120 0.3 120<t 400 0.5 ANGULAR DIMENSIONS t 10 10<t 50 ±30' 50<t 120 ±20' 120<t 400 ±10' 400<t ±5' This drawing is our property; it can't be reproduced or communicated without our written agreement. NEXT ASSY: ... DRAWING REVISION DESCRIPTION DATE APPROVAL 01 1 ITEM REF QTY DESCRIPTION MATERIAL/DRAWING NO. REMARKS/SUPPLIER/CATALOG NO. SIGNATURE: FINISH: DOCUMENT TYPE: Part Drawing 400<t 1000 0.8 1000<t 2000 1.2 DRAWING NUMBER: ... REVISION: 001 PROJECT: ... 15 12 R 55 6 R 2x 25 10 8 THRU 9 THRU 5 R 2x 70 40 20 12 2x THRU 2x R 7 36 10 Example Technical Drawing
4 Creating Three-View Drawings
5 Purpose To graphically represent a 3-D object on 2-D media (paper, screen etc.). Object (3D) placing on the paper (2D) Transparent plate is placed between object and observer’s eyes. Object’s features are transferred through projection . Inconvenient to communicate A view of an object on 2D media Convenient to communicate
6 What is (Planar) Projection? Projections is the process of reproducing a spatial object on a plane, curved surface, or line by projecting its points. A projection is a mapping of a 3D space onto a 2D subspace, i.e. a plane.
7 Elements of (Planar) Projections Every planar projection includes the following elements The 3D object to be projected .

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