AUTOCAD manual BY Xeeshan m ali

8/9/2019 AUTOCAD manual BY Xeeshan m ali

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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

AUTOCAD manual BY Xeeshan m ali

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