Chapt1 Basic Knowledge Of Mechanical Drawing

Name of the course:
Descriptive geometry and mechanical drawing
1. Organization of the course ( 课程安排 )
2. Introduction of the course

Organization of the course
• Lectures---44

• Assignments---submitted before the exercise lesson • Assessment (full score is 100)
-Assignments (30%)—submitted in time + high quality; performance and contribution in the classroom. -Final examination (70%).

Introduction of the course
1.The Characteristic: graphical language for engineering communication 2.Tasks （ content ）
1) Understand the methods of graphical representation
( 图形表达方法，即 representing a 3D object with a 2D drawing)
2) Grasp the methods of descriptive geometric solution
( 画法几何解题方法，即 solve spatial geometric problems in 2D plane) 3) Improve the ability of ideation, visualization, writing, and reading engineering drawings.

3. Learning methods
1) Comprehend projection principles completely—the characteristic and rules of projection
2) Practices —Drawing, Reading and Thinking （ finish assignments in time)

4.The relationship between descriptive geometry and mechanical drawing
Descriptive geometry — fundamental theory of all engineering graphics Mechanical drawing —application of the theory.

5.The relationship with computer aided drawing
Descriptive geometry —how to draw
Computer aided drawing—use what to draw

Mechanical drawing
Fundamental knowledge of mechanical drawing

Fundamental knowledge of mechanical drawing
1. Geometric Construction
2. Some national Standard-related knowledge points
3. Drawing tools and their utilization

Standard drawing sheets /paper formats (GB/T 14689—
2008)

The code of format
2523

B×L
2102

e

Border
1982
1682

841
630
420
210
0

A1

A0

A43
A2

A3 3 A3 4

A4

297

420×
594

594

891 1189

A4

A3

297×420 210×29
7
10
5

25

A4 5

A3

A2

10

a

A44

A1

841×118
594× 841
9
20

c

area

1051

A0

 Standard drawing sheets with layout (GB/T 14689—2008)
Border lines

c

a

c

a

Title block

c

L

c

B

c

c

Sheet frame

L