technical dwg week1

8/12/2019 Technical Dwg Week1

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SWISS GERMAN UNIVERSITY

Wahyu Guritno/ Technical Drawing 1

Technical Drawing

based on ISO Standard


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Objectives

The students are be able to:

read and understand the technical drawing baseon ISO standard

understand the symbols, tolerance, dimensioning make sketch of technical drawing


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What you learn?

1. Intro to Standardization:

Technical Drawing/ ISO Standard/ Paper Size/ Lay out/ Line/Scale/ Letter/ Title block

2. View:

View/ Projection/ First angle projection/ Third angleprojection/ Auxiliary view/ Perspective

3. Section:

Full section/ Half section/ Local section/ Hatching

4. Other representation:

Square end of shaft or opening/ Part located in front ofcutting plane/ View of symmetrical parts/ Shortened of long,big parts/ Simplified representation of repetitive features/Detail, symbol, detail balloon/ Initial outlines/ Use of color intechnical drawing/ Transparent object


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What you learn?

5. Dimensioning:

Scope application/ Reference/ General Principles/ Method ofDimensioning/ Arrangement and Indication/ SpecialIndication/ Indication of level

6. Tolerance:

ISO symbols/ General tolerance/Permissible deviation/

Limits of Size/ Tolerance assy dwg/ Tolerance angulardimension

7. Fits:

Basic hole/ Basic shaft/ Clearance fit/ Transition fit/Interference fit

8. Machining symbols and surface roughness :Symbol/ General rule/ Indication/ Ra Roughness number


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What you learn?

9. Geometrical tolerance :

Tolerance of form/ Orientation/ Location/ Runout/ Generalities/ Definition/ Symbols/Indications on dwg.

10. Welding drawing :

General/ Symbols/ Position on dwg./Dimensioning

11. Pneumatical/ Hydraulical Drawing

12. Representation of machine elements

13. Part Drawing Assembly Drawing14. Interpretation of Drawing, Sketching


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Equipment

Multitask Triangle/ Set triangle Busur derajat

Pencil B, 2B

Rubber eraser

Sharpener A4 block paper


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General rules in my Class

No late comers No short pants

No Sandal

No open lap top during my lessons

Properly dress

Batik dress Friday and Wednesday is a must!


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What is Technical drawing??

Language from designer to manufacturer Tool to express the idea

Technique of creating representation of objects forengineering drawing, architects

Since it is a language so it must be understood bythe people involved, therefore standard is appliedin order to minimize deviation.

Standard used: ISO standard for technical drawing


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What is ISO then??

ISO is International Organization forStandardization

Other then ISO?

DIN (Germany)

SN (Switzerland)

SNI (Indonesia)

ASTM (USA)


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Generaloverview

from designto detail

Planen

Konzeptiern

Enwerfen

Detailieren


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Paper size

A0 = 841 x 1189

A1 = 594 x 841

A2 = 420 x 594

A3 = 297 x 420

A4 = 210 x 297

Base A0 with area 1 m2

Side Ratio = 1 : V2


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Lay out


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Lay out


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Typesof line


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Types of line


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Scale

Full size 1:1

Enlargement 2:1, 20:1, 5:1, 50:1, 10:1, 100:1

Reduction 1:2, 1:20, 1:200, 1:2000

1:10, 1:100, 1:1000

1:5, 1:50, 1:500, 1:5000


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Letter

Vertical or Italic


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Letter


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Letter

Italic 15


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Letter

Vertical


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View: First Angle Projection (European)


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View: First Angle Projection (European)


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View: Third Angle Projection (American)


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View: Third Angle Projection (American)


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Wahyu Guritno/ Technical Drawing

Projection Drawing


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Multiview Projection

Projection a view of an object

Is a photograph enough to describe an object?

A number of views, systematically arranged...


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Perspective ProjectionSource, at a definite distance.


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Four Types of Projection


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Four Types of Projection



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TOP

BOTTOM

FRONT

LEFT RIGHT

REARSix Standard Views


Six Standard Views


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SWISS GERMAN UNIVERSITYSix Standard Views


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Orthographic Drawing


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g p g



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Unfolding theGlass Box

The GlassBox



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Top & Right

Side Views

SWISS GERMAN UNIVERSITYThird Angle Projection


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A transparent pictureplane is set up betweenobject and the station

point of an observers eye.

Mitter Line

D/2

D/2

D/2 D/2

T

F R

SWISS GERMAN UNIVERSITYThird Angle Projection


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Mitter line canonly be used

when the viewsare placed

equidistantly.

?????

SWISS GERMAN UNIVERSITYFirst Angle Projection (Europe & Asia)


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The observer looksthrough the object to the

planes of projection.

Mitter Line

D/2

D/2

D/2 D/2

T

FR



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Third-angle Projection

First-angle Projection

First and Third Angle Projections


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Edge View



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True View

SWISS GERMAN UNIVERSITYForeshortened View


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Normal Surface

Parallel to the planeof projection (true

shape&size)



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Inclined Surface

Perpendicular to aplane, but inclined or

tipped to adjacentplanes. Edge vien onperp. Plane, fs viewon inclined planes



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Oblique Surface

Tipped to all planes.FS on all planes.



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Normal Edge

True length inadjacent planes

Point on perpendicularPlane.



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Inclined Edge

True length inparallel plane

(angled)

Shortened onadjacent planes(vertical /horizontal)



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Oblique Edge

Shortened &Angled

Shortened &Angled



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Angles



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Vertices

A corner or point, intersection of 3 planes



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Meaning of a

Point

A vertexPoint view of an edge



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Meaning of aLine

Visible or hidden:An edge (intersection between 2 surfaces)

Edge view of a surfaceLimiting element of a curved surface



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Hidden Lines

Dashed hidden lines are used to representfeatures that would be hidden behind othersurfaces.



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Center Lines

Used to indicate symmetrical axes of circles



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Order of Drawing

Block out the viewsLocate centerlines

Start details and arcs firstDraw dominant detailsCheck your views


Now : Guess the object....3rd Angle


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Now : Guess the object....3 Angle


Now : Guess the object....1st Angle


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Now : Guess the object....1st Angle


So the Quiz Object....


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So the Quiz Object....


G ess the object


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Guess the object....


Guess the object


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Guess the object....


The object Is a rectangular prism


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The object .... Is a rectangular prism


The object Is a cylindrical prism


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The object ... Is a cylindrical prism


Third Angle Projection


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Third Angle Projection...


So The Object


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So The Object...



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THATS IT FOR TODAY!

technical dwg week1

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