drawing lecture 2
DESCRIPTION
drwTRANSCRIPT
CHAPTER 1 PART 2
INTRODUCTION TO
TECHNICAL DRAWING
Technical Drawing (EMP1102)
Part 2- Introduction to Engineering Drawing.
� Sheet Formats
� Line Types
� Dimensioning Rules and Schemes
Technical Drawing I (EMP1102)
Drawing Standards –Sheet Format
Example C-Size
Revision Block
Border
Zone Identifiers
This is zone C4
Notes
Title Block
Technical Drawing I (EMP1102)
Title block – information.
Technical Drawing I (EMP1102)
Rajah memberikan spesifikasi yang lengkap berhubung dengan jenis bahan, jenis
kekemasan permukaan, rawatan haba, dimensi dan hubungan geometri – sepusat.
limit
Material spec
Surface finishing
1st Angle Projection Heat Treatment
Tolerance
Technical Drawing I (EMP1102)
Drawing layout
Technical Drawing I (EMP1102)
For complete layout please refer Giesecke, Mitchell, Spencer, Hill,
Dygdon & Novsk. 2003. Technical Drawing. 12th Edition. New
Jersey : Prentice Hall, Figure 3.43 Page 59.
Drawing Paper Boarder Line and Title
Technical Drawing I (EMP1102)
Letters and Numbers � Freehand writing and write in single stroke technique.
� Lettering should all be in capitals and underlining should be avoided.
� Size should be at least 3mm on the finished drawing/ plot.
� With the normal paper in landscape orientation and the title block on the bottom right and side, notes to be parallel with the bottom edge.
� General notes shall be normally grouped together. Notes related to specific views may be located adjacent to the view.
� Spacing between words should be not less than 0.2h and not more than 0.6h.
� The height (h) in mm of characters for various drawing sheet sizes (A3,A2,A1) should be as follows:� Titles and drawing numbers: 5mm � Subtitles, headings, views and section : 3.5mm � General notes, materials lists and dimension : 2.5mm
Technical Drawing I (EMP1102)
LETTERING
Technical Drawing I (EMP1102)
Vertical Capital letters with single stroke technique lettering.
LETTERING
Technical Drawing I (EMP1102)
Inclined letters with single stroke technique lettering.
Technical Drawing I (EMP1102)
Use 3H pencil grade to draw the guide line
Use H or F pencil grade with 0.5 size to write the lettering or numbering.
Spacing between letters & numbers is 0.2h
Template to create quick guidelines for lettering.
Technical Drawing I (EMP1102)
LETTERING
Technical Drawing I (EMP1102)
Use 3H pencil grade to draw the guide line
Use H or F pencil grade with 0.5 size to write the lettering or numbering.
Spacing between letters & numbers is 0.2h
LINES – General information
Technical Drawing I (EMP1102)
•Generally, technical drawing is the expression of bodies (or matters) by lines.
•Pieces are composed of variable geometric component. Sides and surfaces of these components are visible but some of them can not be seen because they are behind the back sides.
•To obtain full and precise info about the piece, drawing should be done by using variable lines (instead of using same lines). Moreover, these lines should be drawn at same thickness and shape by everyone. The shapes and thicknesses of lines are given in TS88.
TYPES OF LINE
Type A
Type B
Type G
Type B
Type H
Type H
Type E
Technical Drawing I (EMP1102)
TYPES OF LINE
Type C
Type D
Type G
Type G
Type H
Technical Drawing I (EMP1102)
Break Lines
Dimension
Technical Drawing I (EMP1102)
Technical Drawing I (EMP1102)
Line thicknesses for various sheet sizes
Sheet
Size
LINE TYPE AND THICKNESS (mm)
A B C D E F G H J K
AO,B1 0.7 0.35 0.35 0.35 0.35 0.5 0.35 0.35/
0.7
0.7 0.35
A1,A2,
A3,A4,
0.5 0.25 0.25 0.25 0.25 0.35 0.25 0.25/
0.5
0.5 0.25
Type A – Visible out line
Type B – dimension, projection, hatching and leader line
Type C – short break line
Type D – ruled zigzag line
Type E – hidden outline line
Type D – centre line
Type H – cutting plane of the section
Type J – surface required special treatment
Type K – when drawing a component where it is necessary to show its
relationship to an adjacent part.
Technical Drawing I (EMP1102)