Engineering Graphics - Introduction PPT

Engineering Graphics - Introduction PPT

• 1.
  ERODE SENGUNTHAR ENGINEERINGCOLLEGE (An Autonomous Institution) (Approved by AICTE, New Delhi, Permanently Affiliated to Anna University, Chennai& Accredited by National Board of Accreditation (NBA), New Delhi, National Accreditation Assessment Council, Bangalore) PERUNDURAI, ERODE - 638 057 DEPARTMENT OF MECHANICAL ENGINEERING Presented by, Dr.J.BALAJI., M.E., Ph.D Associate Professor Department of Mechanical Engineering Erode Sengunthar Engineering College Perundurai, Erode 638051.
• 2.
  COURSE INTRODUCTION 19ES106 -ENGINEERING GRAPHICS Course Objective(s): The purpose of learning this course is:  To learn conventions and use of drawing tools in making engineering drawings.  To draw orthographic projection of points and lines.  To draw the projection of planes and simple solids.  To draw the section of solids and obtain the development of surfaces of given solids.  To draw the isometric projection of the given solids. Course Outcome(s): At the end of this course, learners will be able to:  Recognize the conventions and apply construct basic engineering curves.  Draw the orthographic projection of points and lines.  Draw the projection of planes and simple solids.  Draw the section of solid drawings and development of surfaces of given solids.  Draw the isometric projection of the given objects.
• 3.
  UNITS DISTRIBUTION INTRODUCTION (BASICS) UNIT1: PLANE CURVES UNIT 2: PROJECTION OF POINTS AND LINES UNIT 3: PROJECTION OF PLANES & SOLIDS UNIT 4: PROJECTION OF SECTIONED SOLIDS AND DEVELOPMENT OF SURFACES UNIT 5: ISOMETRIC VIEW / PROJECTION & PERSPECTIVE PROJECTION
• 4.
  INTRODUCTION (BASICS) SYNOPSIS 1. DEFINITIONOF ENGINEERING GRAPHICS 2. DRAFTING TOOLS 3. DRAWING SHEETS AND ITS SIZE 4. TYPES OF LINES 5. DIMENSIONING AND TYPES OF DIMENSIONING 6. SCALE 7. LETTERING
• 5.
  1.DEFINITION OF ENGINEERINGGRAPHICS Engineering graphics is the language for Effective Communication among engineers which elaborates the details of any component, structure or circuit at its initial drawing through drawing. 2.DRAFTING TOOL The following are the various drafting tools used in engineering graphics
• 6.
  2.DRAFTING TOOLS…
• 7.
  3.DRAWING SHEETS ANDITS SIZE
• 8.
  4.TYPES OF LINES i.Continuous narrow Lines ii. Continuous wide lines iii. Continuous Narrow Lines With Zigzags iv. Dashed Narrow Lines v. Long-Dashed Dotted Narrow Lines vi. long-dashed dotted narrow line vii. Continuous wide lines
• 9.
  i. Continuous narrowline-Dimension lines, Extension lines, Leader lines, Reference lines, Short center lines, Projection lines, Hatching, Construction lines, Guide lines, Outlines of revolved sections ,Imaginary lines of intersection ii. Continuous narrow freehand line-Preferably manually represented termination of partial or interrupted views, Cuts and sections, if the limit is not a line of symmetry or a Centre line· iii. Continuous narrow line with zigzags -Preferably mechanically represented termination of partial or interrupted views. cuts and sections, if the limit is not a line of symmetry or a center line . iv. Continuous wide line -Visible edges, visible outlines, Main representations in diagrams, maps. flow charts.
• 10.
  5.DIMENSIONING AND TYPESOF DIMENSIONING v. Dashed narrow line -Hidden edges ,Hidden outlines vi. Long-dashed dotted narrow line -Centre lines / Axes. Lines of symmetry, Cutting planes vii. Long-dashed dotted wide line-Cutting planes at the ends and changes of direction outlines of visible parts situated front of cutting plane Dimensioning provided through the distances between the surfaces, location of holes, nature of surface finish, type of material, etc. Elements of dimensioning  Dimension line  Leader line  Origin indication  Dimension  Projection or extension line  Dimension line termination
• 11.
  TYPES OF DIMENSIONS Theyare arranged in three ways.  Chain dimensioning  Parallel dimensioning  Combined dimensioning.
• 12.
  6.SCALE Definition of Scale Scaleis defined as the ratio of the linear dimension of an element of an object as represented in the original drawing to the linear dimension of the same element of the object itself. (1) Full size scale If we show the actual length of an object on a drawing, then the scale used is called full size scale. (2) Reducing scale If we reduce the actual length of an object so as to accommodate that object on drawing, then scale used is called reducing scale. (3) Enlarging scale Drawings of smaller machine parts, mechanical instruments, watches, etc. are mad larger than their real size. These are said to be drawn in an increasing or enlarging scale.
• 13.
  SET OF SCALES Scalesare used to make drawing of the objects to proportionate size desired. These are made of wood, steel or plastic.
• 14.
  7.LETTERING Technical lettering isthe process of forming letters, numerals, and other characters in technical drawing. It is used to describe, or provide detailed specifications for, an object.
• 16.
  Thank you…