MEC110 Mechanical Drawing Lecture Notes PDF

MEC110 Dr. Mohamed Bayomy Mechanical Engineering Department Faculty of Engineering at Shoubra  MEC110 Mechanical Drawing This course aims to provide the students with basic knowledge on assembly drawings and representation of mechanical components. The topics i...

MEC110 Dr. Mohamed Bayomy Mechanical Engineering Department Faculty of Engineering at Shoubra  MEC110 Mechanical Drawing This course aims to provide the students with basic knowledge on assembly drawings and representation of mechanical components. The topics include:  Sections in machine members,  Assembly drawing  Mechanical parts  Detailed drawing  Fits and tolerances,  Geometrical tolerances,  Surface texture and roughness symbols, 2 Mechanical Drawing Dr. Mohamed Bayomy  MEC110 Mechanical Drawing Course Topics Introduction Detail Drawing Fasteners Fits and Tolerances Threaded Fasteners Bolts, Studs and Nuts Surface Roughness Exercises: Non-Threaded Fasteners Clamps. Keys, Cotters and Pins Vises. Assembly drawing principles Power Transmission. Mechanical parts Bearing. Pulleys, Shafts, Axles, Brackets Valves. Coupling, Gears, Bearings, springs, etc. 3 Mechanical Drawing Dr. Mohamed Bayomy  MEC110 Mechanical Drawing References 1- Textbook of Engineering Drawing, K. Venkata Reddy, Second Edition, BS Publications, 2008. 2- Machine Drawing – K.L, Narayana, P. Kannaiah, and K. Venkata Reddy, New age Int. Publisher, Third Edition. 3- Geometric and Engineering Drawing, Ken Morling, 3rdEdition, 2012. 4 Mechanical Drawing Dr. Mohamed Bayomy  MEC110 Mechanical Drawing Marks System 60 marks semester works Summer Training Mid-Term Exam Classwork Homework 60 marks final exam 120 total marks 5 Mechanical Drawing Dr. Mohamed Bayomy  Mechanical Drawing Assembly Detail Drawing Drawing Drawing of various parts of Set of drawing used during the a machine or structure work of making a product in assembled in their relative the workshop. working positions. 6 Mechanical Drawing Dr. Mohamed Bayomy Drawing Classification Assembly Drawing Mohamed Bayomy 7 Mechanical Drawing Dr. Mohamed Bayomy Drawing Classification Assembly Drawing Mohamed Bayomy 8 Mechanical Drawing Dr. Mohamed Bayomy Drawing Classification Detail Drawing ELEVATION SEC. AT X-X ELEVATION SEC. AT X-X Engineering Drawing Production Drawing 9 Mechanical Drawing Dr. Mohamed Bayomy  Orientation of drawing sheet 1. Type X (A0~A3) 2. Type Y (A4 only) A3 420X297 c Part data c c Drawing space Drawing c space Part list Border Title block c lines C =10 mm Title block 10 Mechanical Drawing Dr. Mohamed Bayomy  10 65 10 25 30 4 3 2 Drawing Sheet 1 Title block P.N. DESCRIPTION NO MATL. REMARKS OFF SH.NO. A3 (420x297) SCALE: MECHANICAL DRAWING 10 DATE: TITLE: SEC: 10 NAME: B.NO. 30 30 140 11 Mechanical Drawing Dr. Mohamed Bayoumy  Drawing Scales ‫مقياس الرسم‬ Length, size Scale is the ratio of the linear dimension of an element of an object shown in the drawing to the real linear dimension of the same element of the object. Designation of a scale consists of the word “SCALE” followed by the indication of its ratio, as follow SCALE 1:1 for full size SCALE X:1 for enlargement scales (X > 1) SCALE 1:X for reduction scales (X > 1) Dimension numbers shown in the drawing are correspond to “true size” of the object and they are independent of the scale used in creating that drawing. 12 Mechanical Drawing Dr. Mohamed Bayomy  Sectioning A section view is used to show an area or hidden part of an object by cutting away or removing some of that object. The cut line is called a “cutting plane”, and can be done in several ways. 1. Full section 2. Offset section 3. Half section 4. Aligned section “Revolved section” 5. Broken-out section(Located section) 6. Removed and Revolved section (Detailed section) 13 Mechanical Drawing Dr. Mohamed Bayoumy  Sectioning Cutting plane SEC. ELEVATION PLAN 14 Mechanical Drawing Dr. Mohamed Bayoumy  D 3. Half Section G C C G D SEC. S.V. D-D G-G S. V. AT C-C B-B SEC. ELEVATION AT A-A HALF SEC. ELEVATION H. S. S. V. B A A B PLAN 1. Full section 2. Offset section 15 Mechanical Drawing Dr. Mohamed Bayoumy  4. Aligned section Unsymmetrical Hole 4. 1. Holes Position. A section view that is drawn by Imaginary Rotating the object’s features appeared in a principal view about symmetry axis 16 Mechanical Drawing Dr. Mohamed Bayoumy  4. Aligned section 4. 1. Ribs 17 Mechanical Drawing Dr. Mohamed Bayoumy  5. Broken-out Section The view is made by passing the cutting plane normal to the viewing direction and removing the portion of an object in front of it. A break line is used to separate the sectioned portion from the un-sectioned portion of the view. Break line is a thin continuous line (2H) and is drawn freehand. There is no cutting plane line. 18 Mechanical Drawing Dr. Mohamed Bayoumy  6.1 Removed Section SECTION B–B SECTION A–A B A B A 19 Mechanical Drawing Dr. Mohamed Bayoumy  6.2 Revolved Section This section is especially helpful when a cross-section varies. Revolved sections show cross-sectional features of a part. 20 Mechanical Drawing Dr. Mohamed Bayoumy  Abbreviation Term Abbreviation Term Abbreviation A/F Across Flat HEX HD Hexagonal head ‫اﻹختصارات‬ A/C Across Corner LH Left-hand CRS Centers MAX Maximum CL Center line MIN Minimum CHAM Chamfered NO Number CYL Cylinder or Cylindrical PCD Pitch-circle diameter DIA Diameter R Radius Ø Diameter RH Right-hand SØ Diameter (Spherical) RD HD Rounded head DRG Drawing SCR Screw EQUI SP Equally spaced SH Sheet EXT External □ or ⊠ or SQ Square FIG. Figure STD Standard HEX Hexagon ⊲ Taper 21 Mechanical Drawing Dr. Mohamed Bayomy  Questions? ‫بداية خير لترم سعيد‬ CW. 1: Sectioning Ex. 1,3 HW. 1: Sectioning Ex. 2,4 22 Mechanical Drawing Dr. Mohamed Bayomy