Engineering Graphics and Design Grade 12 P2 2016 QP (Eng)

basic education Department « y) Basic Education "4 REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE if ENGINEERING GRAPHICS AND DESIGN P2 \ i NOVEMBER 2016 j Y MARKS: 100 TIME: 3 hours This question paper consists of 6 pages. INSTRUCTIONS AND INFORMATION This question paper consists of FOUR questions. Answer ALL the questions. ALL drawings are in third-angle orthographic projection, unless otherwise stated. ALL drawings must be completed using instruments, unless otherwise stated. ALL answers must be drawn accurately and neatly. ALL the questions must be answered on the QUESTION PAPER as instructed. ALL the pages, irrespective of whether the question was attempted or not, must be re-stapled in numerical sequence in the TOP LEFT-HAND CORNER ONLY. 8. Proper planning is essential in order to complete all the questions. 9. Print your examination number in the block provided on every page. 10. Any details or dimensions not given must be assumed in good proportion. NOARON> FOR OFFICIAL USE ONLY QUESTION | MARKS OBTAINED | } | SIGN MODERATED |] SIGN RE-MARKING | 3] SIGN 1 2 3 4 TOTAL 2/0/0 2/;0/0 2/0/0 FINAL CONVERTED MARK CHECKED BY 100 COMPLETE THE FOLLOWING: CENTRE NUMBER CENTRE NUMBER EXAMINATION NUMBER EXAMINATION NUMBER Copyright reserved Please tum over

Engineering Graphics and Design/P2 DBE/November 2016 Los Downloaded from hlayiso.com RB 27 10 SLOTTED NUTS ‘AND STUD. 20 37. R12 Sia 7 M4 x 0.8 VIEW 1 ANSWER 17: Construction -@)— | QUESTION 1: ANALYTICAL (MECHANICAL) Given: Three views of a trigger mechanism assembly, an enlarged view, a parts list, a title block and a table of questions. The drawings have not been prepared to the indicated scale. Instructions: Complete the table below by neatly answering the questions, which refer to the accompanying drawings and the title block. [30] QUESTIONS ANSWERS What was Francu's responsibility? What drawing method was used to prepare the drawings? What scale is indicated for the drawing? What should all the unspecified radii be? What material is used to manufacture the striking pin? Name the type of finish at A. Name the type of finish at B. What is VIEW 3 called? Determine the complete dimensions at C: D: How many parts make up the trigger mechanism assembly? What is the purpose of the enlarged view at F? How many surfaces need to be machined? 13, What direction of lay must be applied to the machined surfaces? 14 What is the screw thread specification of the stud nut at G? 15 With reference to the tolerance, determine the maximum height of the feature at H. 16 Referring to the parts list, identify the part at J. 17 In the space above the parts list (ANSWER 17), complete the view of the trigger plate by neatly constructing the R10 fillet. Show ALL construction. 18 In the space below (ANSWER 18), draw, in neat freehand, the convention for a coil spring. 19 In the space below (ANSWER 19), draw, in neat freehand, the symbol for the projection system used. APPROVED: DELISE DATE: 2015-10-31 TOTAL 30 CHECKED: FRANCU DATE: 2015-10-15 DRAWN: CARLOS: PARTS LIST DATE: 2015-10-12 DRAWING PROGRAMME: AUTOCAD 2016 PART QUANTITY MATERIAL ALL UNSPECIFIED RADII ARE R3. SCALE 1:1 4 | BASE 1 CAST IRON TOLERANCE ON ALL DIMENSIONS: + 0,25 mm| STRIKING PIN 1 STAINLESS STEEL SURFACE TREATMENT v= COIL SPRING 1 ‘SPRING STEEL WASHER STAINLESS STEEL HOME SECURITY DOWEL PIN ‘SPRING STEEL PRODUCTS 1 ZIRK BAARD STREET PRETORIA 0001 www.homesecure.co.za m® 012 341 0810 ANSWER 18: Convention for coil spring TRIGGER PLATE STAINLESS STEEL TITLE nJolalalo]r SLOTTED NUT HIGH TENSILE STEEL TRIGGER MECHANISM 8 |sTUD EN 21 STEEL Copyright reserved ANSWER 19: Projection symbol EXAMINATION NUMBER EXAMINATION NUMBER [2 Please tum over

Engineering Graphics and Design/P2 Downloaded from hlayiso.com xo a é DBE/November 2016 QUESTION 2: LOCI NOTE: Answer QUESTIONS 2.1 and 2.2. 2.1 MECHANISM Given: * A schematic drawing of a mechanism consisting of crank OA, connecting rod AB, swivel guide C, sliding rod DE, pin F and horizontal groove GH © The position of centre point O on the drawing sheet Specifications: © The positions of O, C and groove GH are fixed * Connecting rod AB is pin joined to crank OA at A * Sliding rod DE is pin-joined to connecting rod AB at D * Pin F is fixed to sliding rod DE *AB = 120mm °DE 20mm °AD (0 mm. °DF =40mm Motion: As crank OA rotates in a clockwise direction, connecting rod AB freely slides through swivel guide C Point E of sliding rod DE reciprocates along groove GH during the rotation. Instructions: * Draw, to scale 1:1, the given schematic drawing of the ASSESSMENT CRITERIA 2.1 mechanism. 7 Tewen - * Trace the locus generated by point F for ONE complete rotation of crank OA. 2 | CONSTRUCTION 7 Show ALL necessary construction. [20] | 2 | POTS * CURVE 8 SUBTOTAL | 20 Copyright reserved 2.2 AUGER (HELIX) P Given: © The incomplete front view and the left view of an Q auger with PQ indicating the starting position _ _ © The position of centre point R on the drawing sheet Specifications: 90 Pitch =: 60mm ¢Tums — : ONE AND AHALF * Direction : Righthanded Instructions: Draw, to scale 1 : 4, the given left view and the ASSESSMENTIGRITERIAZ2 complete front view of the auger. 1 | GIVEN + CENTRE LINES 4 * Show ALL necessary construction. 2 | CONSTRUCTION 8 * No hidden detail is required. [22] | g | OUTSIDE HELIX + CURVE |g QUALITY 4 | INSIDE HELIX + SHAFT 4 SUBTOTAL 2.2| 22 SUBTOTAL 2.1| 20 TOTAL | 42 EXAMINATION NUMBER EXAMINATION NUMBER [3 Please tum over

somtimes Downloaded from hlayiso.com wn >, QUESTION 3: ISOMETRIC DRAWING Cg a Given: * The front view, top view and left view of a jig * The position of point S on the drawing sheet Instructions: Using scale 1 : 1, convert the orthographic views of the jig into a sectional isometric drawing on cutting plane A-A. * Make S the lowest point of the drawing. « Show ALL necessary construction « NO hidden detail is required. [40] 120 10 20 | 40 20, ASSESSMENT CRITERIA 1 | AUX. VIEW + PLACING 22 9 | ISOMETRIC + 23 NON-ISOMETRIC LINES 3 | SECTIONED SURFACES 9 ISOMETRIC CIRCLES + CIRCLE CONSTR’ Oe TOTAL | 40 EXAMINATION NUMBER: EXAMINATION NUMBER [4 Please turn over Copyright reserved

Engineering Graphics and Design/P2 a 2x@4 OIL HOLE | PCD 80 EXAMPLE OF THE APPLICATION OF THE CONVENTION FOR THE PRESENTATION OF A Downloaded from hlayi SYMMETRICAL OBJECT +1 Iqtr 29 19 A t | bear) / DRILLED AND COUNTERSUNK FOR M8 SCREW O12 oe z 22 EXPLODED ISOMETRIC DRAWING 2HOLES 014,“ \, 120 A 14 152 8B} 0 38 Py |. 8 tte 3 : Va : : - - 2 o14 "~y M8 BLIND 5 o| Fal HOLE 1 Ls 2 | 19 76 BASE [1] a Sp Zs 187 x 108 25 143) 19 | Z| ora _ B16 at---—- s 28 jee 238 | Corrs Gs SPACER [6] LAA M16 x2 SLIDE GUIDE [4] 27. 2+} 38 oe / \ PLATE [3] \gs 28 vrs -L pd 38 | 12 loo SLIDE BLOCK [5] Copyright reserved 48, M16 BOLT [8] TOOL HOLDER [7] so.com M16 x2 DBE/November 2016 QUESTION 4: MECHANICAL ASSEMBLY Given: * Orthographic views of each of the parts of a tool holder assembly *An example of the application of the convention for the drawing of a symmetrical object * The exploded isometric drawing of the parts of the tool holder assembly, showing the position of each part relative to all the others * The top view centre line and reference point S on page 6 Instructions: * Answer this question on page 6. * Using the given centre line and reference point S, draw, to scale 1 : 1 and in third-angle orthographic projection, the following views of the assembled parts of the tool holder assembly: 4.1 A half sectional front view on cutting plane A-A. Show the right side in section, as seen from the direction of the arrow shown on the exploded isometric drawing, The cutting plane is shown on the top view of the base (part 1). 4.2 The top view. Show only the front half of the top view by applying the convention for the presentation of a symmetrical object. NOTE: * Planning is essential. * ALL drawings must comply with the guidelines as contained in the SANS 10111. * Apply the convention of symmetry only to the top view. * Show THREE faces of the M16 bolt (part 8) in the front view. ein this drawing the M16 bolt (part 8) must be completely screwed into the tool holder (part 7) . * Add cutting plane A-A. * NO hidden detail is required. [88] PARTS LIST PARTS QUANTITY MATERIAL 1 BASE 1 CAST STEEL 2 | M16 ADJUSTING SCREW 4 MILD STEEL 3 (| PLATE 1 MILD STEEL 4 | SLIDE GUIDE 4 MILD STEEL 5 | SLIDE BLOCK 1 CAST IRON 6 | SPACER 41 MILD STEEL 7 | TOOL HOLDER 1 MILD STEEL 8 | M16 BOLT 1 MILD STEEL 13 BALLACK STREET BVI NEW GERMANY —_—_— www byjpro.co.za PROJECTS CC 031BMUNICH TOOL HOLDER ALL DIMENSIONS ARE IN MILLIMETRES. © Sd Please tum over

Engineering Graphics and Design/P2 DBE/November 2016 Downloaded from hlayiso.com xo ae é FOR OFFICIAL USE ONLY INCORRECT SCALE INCORRECT HATCHING PARTS NOT ASSEMBLED TOTAL ASSESSMENT CRITERIA TOP VIEW 1 |BODY 53 2 | ADJUSTING SCREW 6 3 | PLATE 1 4 |SLIDE BLOCK 5 |SPACER 6 | TOOL HOLDER 7 |M16 BOLT SUBTOTAL SECTIONAL FRONT VIEW 4 |BoDY 13 2 | ADJUSTING SCREW 10 3 | PLATE 3 4 | SLIDE GUIDE 33 5 | SLIDE BLOCK 43 6 |SPACER 3 7 | TOOL HOLDER 10 8 |M16 BOLT 8 SUBTOTAL] 55 GENERAL 1 | CENTRE LINES 3 2 | CUTTING PLANE 4 3 | ASSEMBLY 7 SUBTOTAL] 14 TOTAL| 88 PENALTIES (-) GRAND TOTAL EXAMINATION NUMBER: EXAMINATION NUMBER [6 Copyright reserved