civil engineering drawing / auto cad ce-01 ammara mubeen
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Civil Engineering Drawing / Auto Cad CE-01 Ammara Mubeen. INTRODUCTION. INTRODUCTION. What is Engineering Drawing - PowerPoint PPT PresentationTRANSCRIPT
Civil Engineering Drawing / Auto Cad
CE-01
Ammara Mubeen
SL Topics
1. Introduction
2. Lettering, Numbering and Dimensioning
3. Conic Section
4. Orthographic Projection
5. Section Views and Auxiliary Views
6. Isometric, Pictorial and Oblique Drawing
7. Development of Surfaces
8.Auto Cad Application
Importance of Engineering Drawing as graphic communication. Link between engineering drawing and other subjects of study.
I. S.O (International standards organization) specification for preparation of drawings.
Use of drawing instruments and materials. Basic Tools- classification and brief description.
Special Tools: Mini-drafter. Drafting Machine.
Scales, Recommended, reduced and enlarged scale.
Lines, Types of lines, Selection of line thickness.
Selection of Pencils.
Drawing sheets, different sheet sizes and standard layouts.
Care and maintenance of drawing material.
INTRODUCTION
INTRODUCTIONWhat is Engineering Drawing
A fully developed language in its own right: A graphical language that Engineers understand all over the world irrespective native tongue. Communication between “DESIGNER and MANUFRACTURER”. BSI, ISO, BIS (Bureau of Indian Standards) set rules are followed.
Engineering Drawing RequirementsUnambiguous and ClearCompleteSuitable for duplicationLanguage IndependentConforms to standards
INTRODUCTIONBASIC LIST OF EQUIPMENTThe following list contains the selection of equipment
necessary for making instrument drawings.1. Case of drawing instruments2. Drawing surface (board or table)3. Drafting edge (T-square, parallel edge, drafting machine)4. Triangles (30o, 45o or adjustable)5. Scales6. Drawing Pencils7. Drafting Tape8. Eraser 9. Dry cleaning pad10.Erasing Shield11.Drawing Paper12.Tracing Paper or drafting film
Instruments
Instruments
Instruments
LINE TYPES
Types of Lines
Types of Lines
Types of Lines
Line Conventions Visible Lines – solid thick lines that represent visible edges or contours Hidden Lines – short evenly spaced dashes that depict hidden features Section Lines – solid thin lines that indicate cut surfaces Center Lines – alternating long and short dashes Dimensioning
Dimension Lines - solid thin lines showing dimension extent/direction Extension Lines - solid thin lines showing point or line to which dimension applies Leaders – direct notes, dimensions, symbols, part numbers, etc. to features on
drawing Cutting-Plane and Viewing-Plane Lines – indicate location of cutting planes
for sectional views and the viewing position for removed partial views Break Lines – indicate only portion of object is drawn. May be random
“squiggled” line or thin dashes joined by zigzags. Phantom Lines – long thin dashes separated by pairs of short dashes
indicate alternate positions of moving parts, adjacent position of related parts and repeated detail
Chain Line – Lines or surfaces with special requirements
Source: http://www.genium.com/pdf/dmpc.pdf
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Viewing-plane line
Extension lineDimension Line Center Line
Hidden Line
Break Line
Cutting-plane Line
Visible Line
Center Line (of motion)
Leader
VIEW B-BSECTION A-A
Section Line
Phantom Line
LetteringPlain GothicItalics are OKABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
SketchingDrawings made without mechanical
drawing toolsFree-HandRulerSimple drawing
program
Should follow standards and conventionsFrom Course Text
Pictorial3-dimensional representations
One-point one vanishing point lines that are not vertical
or horizontal converge to single point in distance
Two-point or Three-point two or three vanishing points
With two points, vertical or horizontal lines parallel, but not both
With three-point, no lines are parallelIsometric
Drawing shows corner of object, but parallel lines on object are parallel in drawing
Shows three dimensions, but no vanishing point(s)
Source: “Introduction to Engineering”, by Paul Wright
One-point
Two-Point
Isometric
Orthographic / MultiviewDraw object from two / three perpendicular views
/ Orthographic
What it looks like pictorially
Section ViewsIf three views
are not enough, draw sections needed to completely describe the object.
Section A-A View B-B
ISO USA Sizes
LetterWidth Length
Letter inchesmm inches mm inches
F 28.0 x 40.0
A0 841 33.11 1189 46.81 E 34.0 x 44.0
A1 594 23.39 841 33.11 D 22.0 x 34.0
A2 420 16.54 594 23.39 C 17.0 x 22.0
A3 297 11.69 420 16.54 B 11.0 x 17.0
A4 210 8.27 297 11.69 A 8.5 x 11.0
ISO Drawing Sheets Sizes
Recommended Books
1.Descriptive Geometry Abbot
2. Elementary Engineering Drawing N. D. Bhatt
5. I.S.I. Specification on drawing - S. C. Sharma
6. Engineering Drawing R. K. Dhawan
7.Fundamentals of Engineering Drawing
Warren J. Luzadder
8. Engineering Drawing Basant Agrawal
9.I.S.M. & S.S.M. on Technical Drawing
T.T.T.I., Madras
Title Block It should contain the following information The title of drawing The drawing and sheet number The Scale The angle of projection used Other information if required
“The scale is the ratio of the linear dimension of an element of an object as represented in the original drawing to the real linear dimension of
the same element of the object itself”
All drawings should be drawn to the scale for which the selected scale should be large enough to permit easy and clear interpretation.
Title Block
Title Block