Week 1 Autocad

8/12/2019 Week 1 Autocad

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ENGINEERING DRAWINGWEEK-1


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INTRODUCTION

DIVISION OF MARKS

QUIZES 20%

SESSIONALS(2) 30%

ASSIGNMENT 10%

VIVA 10%FINAL 30%

RECOMMENDED BOOK ENGINEERING DRAWINGND BHATT (LATEST EDITION)


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INTRODUCTION

VIEWSORTHOGRAPHIC PROJECTION ISOMETRIC

DIMENSIONING

LINES

AutoCADELECTRICAL MECHANICAL

ENGINEERING DRAWING


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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 Drawingspace

Title block

d

d

c

c

cBorderlines

1. Type X (A0~A4) 2. Type Y (A4 only)

Orientation of drawing sheet

Title block

Sheet size c (min) d (min)

A4 10 25 A3 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 drawing Name:- name of the person who produced the drawing

Checked:- before manufacture, drawings are usually checked Version:- many drawings are amended, each revision must be noted Date:- the date the drawing was produced or last amended Notes:- any note relevant to the drawing Scale:- the scale of the drawing Company name:- name of the company Projection:- the projection system used to create the drawing


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imen

Dimensioning


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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


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EXERCISE


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5

Orthographic projection is a parallel projection techniquein which the parallel lines of sight are perpendicu lar to the

projection plane

MEANING

Object views from top

Projection plane

1

2

3

4

5 1 2 3 4

PROJECTORS


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ORTHOGRAPHIC VIEWOrthographic v iew depends on relative position of the object

to the line of sight.

Two dimensions of anobject is shown.

Three dimensions of an object is shown.

Rotate

Tilt

More than one view is neededto represent the object.

Mult iv iew drawing

Axo nom et r ic d rawing


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Orthographic projection technique can produce either

1. Mult iv iew drawing

that each view show an object in two dimensions.2. Axo nom et r ic d rawing

that show all three dimensions of an object in one view.

Both drawing types are used in technical drawing forcommunication.

NOTES

ORTHOGRAPHIC VIEW


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Axonometric (Isometric) Drawing

Easy to understand

Right angle becomes obtuse angle.

Circular holebecomes ellipse.

Distortions of shape and size in isometric drawing

Advantage

Disadvantage Shape and angle distortion

Example


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Multiview Drawing

It represents accurate shape and size. Advantage

Disadvantage 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 thatwork together to give an accurate overall representation of anobject.


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Glass Box Approach

Place the object in a glass box

Freeze the view from each direction (each ofthe six sides of the box) and unfold 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-angle Projection

First-angle Projection

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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EXERCISE

Week 1 Autocad

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