Transcription of ISOMETRIC DRAWING
1 ENGINEERING DRAWING SKKK 1021 ISOMETRIC DRAWING 10/2/2012 1 Agus Arsad, Azizul Azri Bin Mustaffa LEARNING OUTCOMES ISOMETRIC DRAWING It is expected that students will be able to: Understand the significance of ISOMETRIC DRAWING Apply the basics method of ISOMETRIC DRAWING 10/2/2012 2 ISOMETRIC DRAWING INTRODUCTION SIGNIFICANCE TRUE LENGTH BASIC METHOD 10/2/2012 3 INTRODUCTION ISOMETRIC DRAWING method shows the DRAWING in 3-D The real shape of an object can be easily interpreted by using ISOMETRIC DRAWING The construction of an ISOMETRIC DRAWING can be made by viewing the object from certain angle and directions.
2 10/2/2012 4 SIGNIFICANCE In this Chapter, you will be constructing ISOMETRIC drawings from given orthographic projections of an object. ISOMETRIC DRAWING is important to engineering designers as the DRAWING shows clearly what that has been designed It is also useful for equipment designers as they can easily interpret the method of construction of an object or equipment. This type of DRAWING also can cope with beginners of someone who has no basics in engineering DRAWING unlike orthographic DRAWING . 10/2/2012 5 TRUE LENGTH Every measurements that are transferred to the ISOMETRIC DRAWING is in its true length of the object However, only vertical & horizontal lines in orthographic DRAWING can be transferred directly to ISOMETRIC DRAWING .
3 Inclined, oblique lines, circles and others however cannot be transferred directly and must be drawn using certain techniques 10/2/2012 6 10/2/2012 7 Distance in ISOMETRIC DRAWING ISOMETRIC line is the line that run parallel to any of the ISOMETRIC axes. ISOMETRIC axes True-length distances are shown along ISOMETRIC lines. Nonisometric lines BASIC METHODS ISOMETRIC DRAWING is built on 3 main axis namely the vertical axis and two 30 degrees axis from a horizontal line to the left and right of the vertical axis 10/2/2012 8 Vertical Axis 30 degrees axis 30 degrees axis Horizontal line 10/2/2012 9 ISOMETRIC DRAWING and Scale ISOMETRIC DRAWING is a DRAWING drawn on an ISOMETRIC axes using full scale.
4 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 each details. 5. Darken all visible lines. the object in the position which its shape and features are clearly seen. Sketch from an actual object 10/2/2012 11 1. Positioning object. 2. Select ISOMETRIC axis. 3. Sketch enclosing box. 4. Add details. Note In ISOMETRIC sketch/ DRAWING ), hidden lines are omitted unless they are absolutely necessary to completely describe the object.
5 Sketch from an actual object STEPS 5. Darken visible lines. 10/2/2012 12 Front View Top View Side View Example 1 : Object has only normal surfaces Bottom View Side Front Top Regular Reverse W D H H D W Bottom Front Side 10/2/2012 13 Example 2 : Object has inclined surfaces W H D y x Front View y x Nonisometric line 10/2/2012 14 Nonisometric line A A x y x x B B A B C C C x y Example 3 : Object has inclined surfaces 10/2/2012 15 A A B B C D E D E F F x y Front View Regular C Example 4 Reverse 10/2/2012 16 Circle & Arc in ISOMETRIC In ISOMETRIC DRAWING , a circle appears as an ellipse. 2. Construct an ISOMETRIC square.
6 3. Sketch arcs that connect the tangent points. Sketching Steps 1. Locate the center of an ellipse. 10/2/2012 17 Circle & Arc in ISOMETRIC 3. Construct a perpendicular bisector from each tangent point. 4. Locate the four centers. 5. Draw the arcs with these centers and tangent to ISOMETRIC square. Sketching Steps Four-center method is usually used when drawn an ISOMETRIC ellipse with DRAWING instrument. 2. Construct an ISOMETRIC square. 1. Locate the center of an ellipse. 10/2/2012 18 Example 5 10/2/2012 19 Irregular Curve in ISOMETRIC 1. Construct points along the curve in multiview DRAWING .
7 2. Locate these points in the ISOMETRIC view. 3. Sketch the connecting lines. Steps END OF CHAPTER 5 10/2/2012 20
