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AutoCADMANUAL
BY: XEESHAN MOHSIN ALI
AutoCADMANUAL
BY: XEESHAN MOHSIN ALI
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INTRODUCTION
DIVISION OF MARKS
QUIZES 30%
SESSIONALS(2) 30%
ASSIGNMENT 10%
VIVA 10%
FINAL 30%
RECOMMENDED BOOK ND BHATT (LATESTEDITION)
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INTRODUCTION
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DRAWING INSTRUMENTS
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DRAWING INSTRUMENTS
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QUADRANTS
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DRAWING SHEET
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Drawing space Drawing
space
Title block
d
d
c
c
cBorder
lines
1. Type X (A0~A4) 2. Type Y (A4 only)
Orientation of drawing sheet
Title block
Sheet size c (min) d (min)
A4 10 25A3 10 25
A2 10 25
A1 20 25
A0 20 25
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SAMPLE OF DRAWING SHEET
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Drawing layout
All engineering drawings should feature a title block.
The title block should include:
Title:- title of the drawingName:- name of the person who produced the drawing
Checked:- before manufacture, drawings are usually checkedVersion:- many drawings are amended, each revision must be notedDate:- the date the drawing was produced or last amendedNotes:- any note relevant to the drawingScale:- the scale of the drawingCompany name:- name of the company
Projection:- the projection system used to create the drawing
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imen
DimensioningDimensioning
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LINE CONVERSIONS
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
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LINE CONVERSIONS
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 forsectional views and the viewing position for removed partial views
Break Lines indicate only portion of object is drawn. May be random squiggledline or thin dashes joined by zigzags.
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Dimensioning
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MATERIALS USED
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OrthographicProjection
OrthographicProjection
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Which Views to Present?
General Guidelines
Pick a Front View that is mostdescriptive of object
Normally the longest dimension ischosen as the width (or depth)
Most common combination of views is
to use:
Front, Top, and Side View
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EXERCISE
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5
Orthographic projectionOrthographic projectionis a parallel projection technique
in which the parallel lines of sight areperpendicularto the
projection plane
MEANING
Object views from top
Projection plane
1
2
3
4
51 2 3 4
PROJECTORS
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ORTHOGRAPHIC VIEW
Orthographic viewOrthographic view depends on relative position of the object
to the line of sight.
Two dimensions of an
object is shown.
Three dimensions of an object is shown.
Rotate
Tilt
More than one view is needed
to represent the object.
Multiview drawingMultiview drawing
Axonometric drawingAxonometric drawing
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Orthographic projection technique can produce either
1.1. Multiview drawingMultiview drawing
that each view show an object in two dimensions.2.2.Axonometric drawingAxonometric drawing
that show all three dimensions of an object in one view.
Both drawing types are used in technical drawing for
communication.
NOTES
ORTHOGRAPHIC VIEW
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Axonometric (Isometric) Drawing
Easy to understand
Right angle becomes obtuse angle.
Circular hole
becomes ellipse.
Distortions of shape and size in isometric drawing
AdvantageAdvantageDisadvantageDisadvantage Shape and angle distortion
Example
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Multiview Drawing
It represents accurate shape and size.AdvantageAdvantage
DisadvantageDisadvantage Require practice in writing and reading.
Multiviews drawing (2-view drawing)Example
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Orthographic Projections
Orthographic Projections are a collection of 2-D drawings that work together to give anaccurate overall representation of an object.
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Glass Box Approach
Place the object in a glass box
Freeze the view from each direction(each of the six sides of the box) andunfold the box
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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Glass Box Approach
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QUADRANTS
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Third-angleProjection
First-angleProjection
First and Third Angle Projections
First Angle
Third Angle
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EXERCISE
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EXERCISE
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EXERCISE
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EXERCISE
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EXERCISE
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EXERCISE
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EXERCISE
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EXERCISE
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AXANOMETRIC VIEW
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