# ISOMETRIC DRAWING - Universiti Teknologi Malaysia

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ENGINEERING DRAWINGSKKK 1021ISOMETRIC DRAWINGAgus Arsad, Azizul Azri Bin Mustaffa10/2/20121

LEARNING OUTCOMESISOMETRIC DRAWINGIt is expected that students will be able to: Understand the significance ofisometric drawing Apply the basics method of isometricdrawing10/2/20122

ISOMETRIC DRAWING INTRODUCTIONSIGNIFICANCETRUE LENGTHBASIC METHOD10/2/20123

INTRODUCTION Isometric drawing method shows thedrawing in 3-D The real shape of an object can beeasily interpreted by using isometricdrawing The construction of an isometricdrawing can be made by viewing theobject from certain angle anddirections.10/2/20124

SIGNIFICANCE In this Chapter, you will be constructing isometricdrawings from given orthographic projections of anobject. Isometric drawing is important to engineeringdesigners as the drawing shows clearly what that hasbeen designed It is also useful for equipment designers as they caneasily interpret the method of construction of anobject or equipment. This type of drawing also can cope with beginners ofsomeone who has no basics in engineering drawingunlike orthographic drawing.10/2/20125

TRUE LENGTH Every measurements that are transferred tothe isometric drawing is in its true length ofthe object However, only vertical & horizontal lines inorthographic drawing can be transferreddirectly to isometric drawing. Inclined, oblique lines, circles and othershowever cannot be transferred directly andmust be drawn using certain techniques10/2/20126

Distance in Isometric DrawingTrue-length distances are shown alongisometric lines.Isometric line is the line that run parallel to any ofthe isometric axes.Nonisometric linesIsometric axes10/2/20127

BASIC METHODS Isometric drawing is built on 3 main axisnamely the vertical axis and two 30 degreesaxis from a horizontal line to the left andright of the vertical axisVertical Axis30 degrees axis30 degrees axisHorizontal line10/2/20128

Isometric Drawing and ScaleIsometric drawing is a drawing drawn on an isometricaxes using full scale.Isometric projection(True projection)Isometric drawing(Full scale)ForeshortenFull scale10/2/20129

Sketch from an actual object1.Place the object in the position which itsshape and features are clearly seen.2. Define an isometric axis.3. Sketching the enclosing box.4. Estimate the size an and relationship ofeach details.5. Darken all visible lines.10/2/201210

Sketch from an actual objectSTEPS1. Positioning object.2. Select isometric axis.3. Sketch enclosingbox.4. Add details.5. Darken visible lines.Note In isometric sketch/drawing), hidden lines are omittedunless they are absolutely necessary to completelydescribe the object.10/2/201211

Example 1 : Object has only normal surfacesTopTop ViewRegularHFront ViewWHFrontSide ViewWDFrontBottom View10/2/2012SideDSideReverseBottom12

DExample 2 : Object has inclined surfacesNonisometric lineyHyxFront ViewxW10/2/201213

Example 3 : Object has inclined surfacesxCBAxxxBAyCyCBANonisometric line10/2/201214

Example 4RegularxyCEDBFront ViewFABReverseCA10/2/2012DFE15

Circle & Arc in IsometricIn isometric drawing, a circle appears as an ellipse.Sketching Steps1. Locate the center of an ellipse.2. Construct an isometric square.3. Sketch arcs that connect thetangent points.10/2/201216

Circle & Arc in IsometricFour-center method is usually used when drawnan isometric ellipse with drawing instrument.Sketching Steps1. Locate the center of an ellipse.2. Construct an isometric square.3. Construct a perpendicularbisector from each tangent point.4. Locate the four centers.5. Draw the arcs with these centersand tangent to isometric square.10/2/201217

Example 510/2/201218

Irregular Curve in IsometricSteps1. Construct points along thecurve in multiview drawing.2. Locate these points in theisometric view.3. Sketch the connectinglines.10/2/201219

ENDOFCHAPTER 510/2/201220

Isometric drawing is a drawing drawn on an isometric axes using full scale. Isometric projection (True projection) Isometric drawing (Full scale) Foreshorten Full scale . 10/2/2012 10 2. Define an isometric axis. 3. Sketching the enclosing box. 4. Estimate the size an and relationship of

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