Engineering Graphics and Design Grade 12 P2 NSC June 2021 QP

basic education Department « y) Basic Education "4 REPUBLIC OF SOUTH AFRICA SENIOR CERTIFICATE EXAMINATIONS/ NATIONAL SENIOR CERTIFICATE EXAMINATIONS 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 prepared using pencil and 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. Time management 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. FON> NO ENGINEERING GRAPHICS AND DESIGN P2 2021 MARKS: 100 TIME: 3 hours This question paper consists of 6 pages. | | | | | | | Barcode label | | | | | | | FOR OFFICIAL USE ONLY question | marks osTaen | } | sic} moveraten | } | sion] Re-MARKING | } | 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 Copyright reserved EXAMINATION NUMBER Please tum over

Engineering Graphics and Design/P2 DBE/2021 Se ANSWER 19, Downloaded from hlayiso.com QUESTION 1: ANALYTICAL (MECHANICAL) Given: Two views of a rear derailleur assembly for a bicycle, a detailed enlargement, a title block and a table of questions. The drawing is not presented to the indicated scale. Instructions: Complete the table below by neatly answering the questions which refer to the accompanying drawing, the title block and Copyright reserved mechanical content. [30] 1 | What is the title of the drawing? 1 2 | In which street is the engineering company situated? 1 3. | How many sets of drawings are there for this assembly? 1 4 | Who checked the drawing? 1 5 | What is the file name? 1 6 [If VIEW 1 is the front view, what is VIEW 2 called? 2 7 |Label the detailed enlargement of the encircled area at A on the given drawing. 1 8 | How many coil springs are there in the assembly? 1 9 | Determine the complete dimensions at: B: c: D: E: 4 10 | Measure the angle at F 1 11 | f scale 1 : 2 was used, what would the dimension at G read? 1 = 1 L 12 |Name the type of finish at H 1 eosanaall Ht 13 | What does the abbreviation AF at J stand for? 1 2 —-—- tH 44 | Name the type of section at K. 1 4 SPTSSOR HT Hl 15 | Complete the cutting plane in VIEW 1 by inserting the arrows. Label the cutting plane P-P. 3 oh, W 46 | Name the type of section produced by cutting plane P-P. 1 +f is 47 | With reference to the tolerance, determine the complete minimum 2 dimension at L 4g | IM the space below (ANSWER 18), draw, in neat freehand, the SANS 10117 conventional A representation of a BEARING. go | IP the space to the left of VIEW 1, under ANSWER 19, draw and label, in proportion and in neat 5 - freehand, a removed section according to cutting plane S-S. H TOTAL | 30 ___ ANSWER 18: ’ g ale Fa 33 3 / R20 3 3 2 VIEW 1 VIEW 2 _ DRAWING SET: 18 SPEED STREET FILE NAME: VBJW031 | DRAWING No: JOP12 10F3 Very Best Jockey WHEELS CHAINVILLE DRAWING PROGRAM: AUTOCAD 2019 SCALE 1:1 ENGINEERING (vw) ono DRAWN BY: REINHARD DATE: 02/03/2020 www.bicycleparts.sa | CELL: 098 765 4321 © Ee} EXAMINATION NUMBER CHECKED BY: MAFIKA DATE: 03/03/2020 [TITLE REAR DERAILLEUR ‘APPROVED BY: TSuMI DATE: 09/03/2020 ASSEMBLY SXANINATION NUNEERT [2 Please tum over

Engineering Graphics and Design/P2 Se DBE/2021 Downloaded from hlayiso.com ROLLER-FOLLOWER AND CAMSHAFT DETAIL Copyright reserved QUESTION 2: LOCI (CAM) Given: © The detail of a camshaft and a roller-follower at the minimum distance from the camshaft centre * The position of centre point M on the drawing sheet Specifications: ¢ The roller-follower reciprocates on a 30° centre line that passes through the centre of the camshaft * The minimum distance from the centre of the roller of the follower to the centre of the camshaft = 22 mm * Rotation = clockwise Motion: The cam imparts the following motion to the roller-follower: * It moves 48 mm outwards from its given position with uniform motion over the first 60° * There is a dwell period for the next 45° elt moves a further 12 mm outwards with uniform motion over the next 75° It returns to its original position with uniform acceleration and retardation over the remainder of the rotation Instructions: * Draw, to scale 1: 1, the camshaft and the roller-follower in the given position. * Draw, to a rotational scale of 30° = 8 mm anda displacement scale of 1 : 1, the complete displacement graph for the required motion. * Label the displacement graph and include the rotational scale. * Using the given position of the roller-follower as the 0° axis, project and draw the cam profile from the displacement graph. * Show the direction of rotation on the cam profile. * Show ALL construction and projection. [38] ASSESSMENT CRITERIA 4 [Pcenreunes | 5 2. | GRAPH CONSTRUCTION 53 3 | DISPLACEMENT GRAPH 4 | CAM CONSTRUCTION 5 | CAM + CURVE QUALITY 153 PENALITIES TOTAL | 38 EXAMINATION NUMBER EXAMINATION NUMBER | 3 Please tum over

Engineering Graphics and Design/P2 Downloaded from hlayiso.com - Se QUESTION 3; ISOMETRIC DRAWING Given: * The front view, top view and right view of a groove block and slider assembly * The position of point S on the drawing sheet Instructions: Using scale 1: 1, convert the orthographic views of the groove block and slider assembly into a sectional isometric. drawing on cutting plane A-A. * Make S the lowest point of the drawing. * Show ALL construction. * NO hidden detail is required [42] 100 8) 16 8 60 80, 4100 ASSESSMENT CRITERIA 1 | AUX. view + PLACING 2 2 | LoweR PORTION 15 3. | UPPER PORTION 14 4 | SECTION 8 5 |consrescenmmetnes | 3 PENALTIES TOTAL| 42 EXAMINATION NUMBER EXAMINATION NUMBER | 4 Copyright reserved Please tum over

a Download ed Teom hlayiso.com sc QUESTION 4: ASSEMBLY DRAWING 10 Given: * The exploded isometric drawing of the parts of a pressure » fs pump assembly, showing the position of each part relative to all the others a * Orthographic views of each of the parts of the pressure pump assembly WELDING SYMBOL * Awelding symbol Instructions: * Answer this question on page 6. * Draw, to scale 1: 1 and in third-angle orthographic oo 3 r projection, the following views of the assembled parts of ‘o fas) + rt 37 at n a os Loe fet RUBBER SEAL [2] a the pressure pump assembly: 4.1 A half-sectional front view on cutting plane A-A, as | seen from the direction of the arrow on the exploded _ . isometric drawing. The cutting plane is shown on the right view of the cylinder (part 1). a0 HOOK [6] 4.2 The top view n o10 4.3 The right view NOTE: * Planning is essential. * The drawing must comply with the guidelines as contained in the SANS 10111. * The convention of symmetry may NOT be applied. * Place the head of the plunger (part 3) inside the rubber seal (part 2). * Place surface P on the rubber seal (part 2) against surface P on the inside of the cylinder (part 1). * Show THREE faces of the M44 nut (part 9) in the front view. * The hook (part 6) must be welded onto the bracket (part 7) Draw, to the given size, the complete welding symbol in CYLINDER [1] | 250 20 _fro| BUSH [4] PLUNGER [3] < the correct position on the right view. | * NO hidden detail is required [90] 2 PARTS LIST | PART QUANTITY MATERIAL GUIDE [5] oa 1 CYLINDER 1 ALUMINIUM 2.| RUBBER SEAL 1 RUBBER WASHER [8] 3 PLUNGER 1 MILD STEEL 4 BUSH 1 BRASS 2. 5 GUIDE 1 ALUMINIUM 6 HOOK 1 MILD STEEL 7 BRACKET 1 MILD STEEL 8 WASHER 1 MILD STEEL 9 M44 NUT 1 MILD STEEL WESTO PUMPS DINALEDI PAP 1020 ENGINEERING (PTY) LTD www. westopumps.za M44 NUT [9] PRESSURE PUMP. EXPLODED ISOMETRIC DRAWING MILLIMETRES ARE RARE A © e&4 [5] _—_— 000000 UH SE

a Downloaded from hlayiso.com sc QB FOR OFFICIAL USE ONLY ge INCORRECT OVERALL SCALE INCORRECT HATCHING PARTS NOT ASSEMBLED TOTAL PENALTIES (-) ASSESSMENT CRITERIA RIGHT VIEW 4 |sHaFT+BusH | 14 CYLINDER + 2 | BRACKET + 4 HOOK 3 [Gur 8 SUBTOTAL 4 HALF-SECTIONAL FRONT VIEW 1 | CYLINDER 12 2 | RUBBER SEAL 23 3 | PLUNGER 5 4 | BUSH 23 5 | GUIDE 114 6 Reoe 6 7 |waster’ | 62 SUBTOTAL 46 TOP VIEW 1 | CYLINDER 53 2 Beast 3} 3 |culbe+sHart | 44 4 |Washen 4 SUBTOTAL 173 GENERAL 41 | CENTRE LINES 3 2 | ASSEMBLY 8 SUBTOTAL 15 TOTAL| 90 PENALTIES (-) GRAND TOTAL EXAMINATION NUMBER EXAMINATION NUMBER 6 Lael i OH