Engineering Graphics and Design Grade 12 P2 2017 QP (Eng)

basic education Department « y) Basic Education "4 REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE . i ENGINEERING GRAPHICS AND DESIGN P2 \ i] iit i FEBRUARY/MARCH 2017 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 orthographic drawings are in third-angle 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 | 3 | SIGN MODERATED 3] SIGN RE-MARKING 2 | 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/Feb.-Mar. 2017 40 M22. Downloaded from hlayiso.com QUESTION 1; ANALYTICAL (MECHANICAL) Given: questions. The drawings have not been prepared to the indicated scale. M12 Instructions: block. An assembly drawing showing two views of a gas regulator assembly, a parts list, a title block and a table of Complete the table below by neatly answering the questions, which refer to the accompanying drawing and the title [30] QUESTIONS ANSWERS What is the title of the drawing? What is the web address of the company? What method of machining is prescribed? VIEW 2 Which drawing program was used to prepare the drawing? On what date was the drawing drawn? Who approved the drawing? What material is used to manufacture the seal? What is VIEW 1 called? olo}/nljolalaleo|nr Name the feature at A. } Determine the complete dimensions at B: Cc: 11 | Measure the angle at E 12 | Why is the part at F filled in solid? 13 | What is indicated by the feature at G? 14 | Name the type of finish at H 23 a Refer to the parts list and identify the part at J How many surfaces of the gas regulator assembly must be o16 16 machined? 13 17 | Why is the feature at K tapered to one side only? | 40 18 | Insert the cutting plane on VIEW 2 and label it S-S. PARTS LIST VIEW 1 19 | In the space below (ANSWER 19), draw, in neat freehand, the convention for a coil spring. 3 PART QUANTITY MATERIAL 90 | In the space below (ANSWER 20), draw, in neat freehand, the symbol for the projection system 1 | PRIMARY BASE 1 used. BRASS APPROVED: SOON DATE: 2018-12-06 2 | INLET 1 BRASS CHECKED: VERNON DATE: 2015-11-10 TOTAL | 30 ANSWER 19: e INLET SEAL RUBBER DRAWN: WIKUS DATE: 2015-10-31 Convention for a coil spring 4 | INLET SCREW BRASS DRAWING PROGRAMME: AUTOCAD 2016 VALVE ASSEMBLY BRASS ALL UNSPECIFIED RADII ARE R2. SCALE 1:1 VALVE SPRING METHOD OF MACHINING: MILLING ‘SPRING STEEL DIAPHRAGM ASSEMBLY DIAPHRAGM STAINLESS STEEL THE ONE GAS a) soe eee www.theonegas.coza RUBBER COMPANY elelrlola PRESSURE SPRING ‘= 012 367 8910 SPRING STEEL | TITLE ANSWER 20: Projection symbol 10 | CaP EXAMINATION NUMBER: BRASS GAS REGULATOR 14 | OUTLET EXAMINATION NUMBER [2 Copyright reserved = INNA Please tum over

Engineering Graphics and Design/P2 xo ae é ° QUESTION 2: LOCI NOTE: Answer QUESTIONS 2.1 and 2.2. 2.1 LOCI (HELIX) Given: * A front view and left view of the shaft of an auger with Q indicating the starting position pe a - - * The position of point P on the drawing sheet 234 if, " AUGER SHAFT DETAIL Specifications: Copyright reserved * Nominal diameter: 274mm * Pitch : 72mm © Turns : ONE AND A HALF * Direction : Left-handed Instructions: ASSESSMENT CRITERIA 2.1 Draw, to scale 1: 1, the complete front view | 1 | GIVEN+CENTRELINES | 3 and left view of the auger. > | CONSTRUCTION ry Show ALL construction. 3 | OUTER HELIX 53 * NO hidden detail is required. [23] 4 | INNER HELIX + SHAFT 43 5 | CURVE QUALITY 2 PENALTIES () SUBTOTAL 23 2.2 CAM Given: The bottom left 0° starting position of the displacement graph on the answer sheet Motion: * The follower rises with uniform motion for 15 mm over the first 30° of rotation. « There is a dwell period for the next 15°. * The follower rises with simple harmonic motion for 65 mm over the next 135°, to the maximum displacement of 80 mm. « There is a dwell period for the next 90°. « The follower returns with uniform acceleration and retardation to the original position over the rest of the rotation. Instructions: Draw, to a displacement scale of 1: 1 anda horizontal scale of 360° = 180 mm, the complete displacement graph for the required ASSESSMENT CRITERIA 2.2 motion. 1 | CONSTRUCTION 6 * Label the graph and indicate the horizontal > | poivts + cuRVES 9 scale. Show ALL construction [16] | 3 | LAsets 1 PENALTIES () 2.2 SUBTOTAL 16 2.1 SUBTOTAL 23 TOTAL | 39 EXAMINATION NUMBER EXAMINATION NUMBER [3 Please tum over,

Engineering Graphics and Design/P2 xo ae é Downloaded from hlayiso.com ee QUESTION 3: ISOMETRIC DRAWING Given: © The front view and top view of a bracket © The position of point S on the drawing sheet Instructions: Using scale 1 : 1, convert the orthographic views of the bracket to an isometric drawing. * Make S the lowest point of the drawing. * Show ALL construction 60 * NO hidden detail is required. [39] 58 45 3| 58 36 T I 2 | 3| ' i ces © 1} (ote © || ial H ASSESSMENT CRITERIA 4 | AUXILIARY VIEW + a PLACEMENT 2 | FRONT + REAR SECTION 25 3 | HEXAGON 4 4 | CIRCLE + CL 8 PENALTIES (-) TOTAL| 39 EXAMINATION NUMBER EXAMINATION NUMBER [4 Copyright reserved Please tum over

semaine Downloaded from hlayiso.com sum QUESTION 4: MECHANICAL ASSEMBLY Given: o * Orthographic views of each of the parts of a tension pulley "| assembly an * The exploded isometric drawing of the parts of the tension pulley assembly, showing the position of each part relative to all the others Instructions: * Answer this question on page 6. © Draw, to scale 1: 1 and in third-angle orthographic projection, the following views of the assembled parts of I Ch) WASHER [8] M12 NUT [9] the tension pulley assembly: 4.1 The front view as seen from the direction of the arrow shown on the exploded isometric drawing | 8 7- Le- | + 4.2 Ahalf-sectional top view on cutting plane A-A i Show the front haif in section, in accordance with g| Hl the cutting plane that is shown on the left view of +P t ri PULLEY [7] the housing (part 1). i] 4.3. The left view 5 _-| 5 —-| |. 5 L | | NOTE: 50 20 * Planning is essential HOUSING [1] + ALL drawings must comply with the guidelines contained in the SANS 10111. * The convention of symmetry may not be applied. o10 © The spring (part 4) must be drawn in convention and in neat freehand. « Show THREE faces of the M12 nut in the top view. * Add cutting plane A-A. gq gq * NO hidden detail is required [92] BUSH [6] PARTS LIST PART QUANTITY MATERIAL 1 | HousING 1 MILD STEEL 4 me 2 | FORK 1 CAST IRON ois f coy 3 [Pin 1 MILD STEEL cee ] 4 | SPRING 1 SPRING STEEL 405 Es 2 3 5 | M1280LT 1 MILD STEEL FORK [2] 2 Al i 6 | BusH 2 BRASS Vy e 1 8 | WASHER 1 MILD STEEL | _.| Mit2 9 | wiz. nut 1 MILD STEEL | T ey _| “TENSION PULLEY _— “ EXPLODED ISOMETRIC DRAWING 54 PEARL ROAD GENERAL PERSEVERANCE 6000 Bon M12 BOLT [5] ENGINEERING WORKS #R pei 95 1600 ALL DIMENSIONS ARE | ALL UNSPECIFIED = E — — ONION — I Copyright reserved Please tum over

somtntenite Downloaded from hlayiso.com _ FOR OFFICIAL USE ONLY Cg INCORRECT ORTHOGRAPHIC PROJECTION é INCORRECT SCALE INCORRECT HATCHING PARTS NOT ASSEMBLED TOTAL PENALTIES (-) ASSESSMENT CRITERIA FRONT VIEW 1 | Housine + PIN EB 2 | FORK 4 3 | PULLEY 1 4 M2 BOLT * WASHER + 6 SUBTOTAL 14 SECTIONAL TOP VIEW 1 | HOUSING + PIN 7 2 | FORK 103 3 | M12 BOLT 7 4 | BUSH 4 5 | PULLEY 7} 6 | WASHER + m2 NUT a4 SUBTOTAL 404 LEFT VIEW 4 | HOUSING 43 2 | FORK 13 3 | SPRING 2 4 | BUSH 1 5 | PULLEY 43 g | MIEBOLT +wasHIER+ | 4 SUBTOTAL 22 GENERAL 1 | CENTRE LINES 63 2 | ASSEMBLY 9 SUBTOTAL 154 TOTAL | 92 PENALTIES (-) GRAND TOTAL EXAMINATION NUMBER INNA sameness 18 Copyright reserved SEAS TOE DUCAT IONS