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Lec 1- introduction.pptx
- 1. Descriptive Geometry Dr. Tareq Al- hababi Sana’a University Faculty of Engineering Lecture 1 Introduction and Projection of Points
- 2. Referen ce: M. B. Shah, B. C. Rana, 2009 Engineering Drawing, 2nd Edition, India, Dorling Kindersley
- 3. Course Policies: The students should have more than 75 % of attendance. The students should attend the lectures within 1 minute from starting of the lecture. The student should attend the exams on time. Assignments & Projects should be submitted on time. Schedule of Assessment Tasks for Students During the Semester: Assessment Type of Assessment Tasks Proportion of Final Assessment 1 Written assignment 10 2 Quizzes. 10 3 Mid-term exam. 20 4 Final-exam. 60 Sum 100%
- 4. Introduction: Basics Chapter 5 : Projections of Points and Lines Chapter 6 : Projections on Auxiliary Reference Planes Chapter 7 : Projections of Planes Chapter 8 : Projections of Solids Chapter 9 : Sections of Solids Contents
- 8. Standard sizes of drawing paper A7 A7 A6 A4 A3 A2 A1 A0 841 mm 1189 mm A5
- 9. Note: The table data and the followed margin measurements will be introduced by the teaching assistants in the section time. Preparing the sheet Title block should contain: name, title, date, scale, drawing number and etc. Top margin Bottom margin Right margin Left margin
- 10. Symbolic lines • Note: The lines of one drawing must be of equal thickness. Lines of symmetry Visible edges Visible outlines Centre lines Hidden outlines Hidden edges FIGURE 2.1 A stainless steel glass drawn using symbolic lines (a)- (ii) (g)- (i) (a)- (i) (f)- (i) (f)- (ii) (g)- (ii)
- 11. FIGURE 1.3 A compass Drawing tools • Drawing papers • Pencils • Erasers 45o 60o 30o 45o
- 12. Chapter 5 Projections of Points and Lines
- 13. Elements of descriptive geometry Point Plane Line B m = AB A point line
- 14. Orthographic projection VP P’ P Projector An observer at infinity in front of a plane FIGURE 5.1 A plane of projection
- 15. X Y Names and definitions FIGURE 5.2’ The vertical and horizontal planes of projection Vertical Plane (VP) = Y axis Front view (FV) = Front elevation = elevation = 𝑝′ Horizontal Plane (HP) = X axis Top view (TV) = Top plane = simply plane = 𝑝 The line of intersection of the HP and the VP is known as hinge line or ground line or reference line or (XY line).
- 16. X Y 1 2 3 4 1 2 3 4 FIGURE 5.2 The vertical and horizontal planes of projection The dihedral angles or quadrant numbers Location Dihedral Angle or Quadrant Number In front of the VP, above the HP First Behind the VP, above the HP Second Behind the VP, below the HP Third In front of the VP, below the HP Fourth TABLE 5.1 The dihedral angles or quadrant numbers #
- 17. The End of Lecture 1
Editor's Notes
- الأحجام القياسية لورق الرسم
- تحضير الورقة يجب أن تحتوي كتلة العنوان على: اسم عنوان تاريخ مِقياس رسم رقم الرسم و الخ. ملاحظة: سيتم تقديم بيانات الجدول وقياسات الهامش المتبعة من قبل مساعدي التدريس في وقت التمارين.
- خطوط رمزية: الخطوط الرمزية هي أنواع محددة من الخطوط المستخدمة في الرسومات الهندسية لتمثيل ميزات معينة أو نقل معلومات معينة و تستخدم للإشارة إلى شروط أو متطلبات محددة. فيما يلي بعض الأنواع الشائعة من الخطوط الرمزية المستخدمة في الرسومات الهندسية. يجب أن تكون خطوط الرسم الواحد متساوية السماكة.