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PAGE 10F 6 ® YW swssemen matters NATIONAL SENIOR CERTIFICATE EXAMINATION 2019 ENGINEERING GRAPHICS AND DESIGN L FOR OFFICIAL USE ONLY question || SECTION || MARK |[MoveraTeD|| maximu} CODE PAPER 2 1 | Nance 20 2 | om 40 MARKS: 200 3 || ‘souernic 40 TIME: 3 HOURS 4 [ame 100 PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY TOTAL 200) 1. This question paper consists of 6 pages, including the cover page and 4 questions. 2. All questions must be answered. 3. Unless specified otherwise, all questions are in third-angle orthographic projection. 4. Unless specified otherwise, all questions are to be completed to a scale of 1:1. 5. All answer sheets must be re-stapled in numerical order and handed in, even unanswered questions. 6. All construction work must be shown, even if a stencil was used. 7. Print your examination number neatly on each page. 8. Use only the answer sheets provided. a Your drawings should be well presented and reflect neatness and accuracy. Marks will be deducted for untidy and inaccurate work. 10. All dimensions or detail not given may be assumed in good proportion. 11. Stencils and calculators may be used. 12. All drawings must adhere to the SANS 10111-1. 13. In order to save time, detailed assembly parts must be drawn to convention. EXAMINATION NUMBER Lit Tf | | | | TT J IEB COPYRIGHT © 2019 PLEASE TURNOVER

NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND PAGE 20F 6 QUESTION 1 MECHANICAL ANALYTICAL [PART a PART © STUDY THE ADJACENT DRAWING AND ANSWER THE QUESTIONS THAT FOLLOW: (1.1 What does the abbreviation "NTS" stand for? Q) 1.2 What does the abbreviation "PCD" stand for? (1) ‘1.3 Name the part that is manufactured from key steel? (1) (1.4 What is the tolerance on all dimensions? (4) '1.5 What are the maximum and minimum dimensions tolerated at 4 in Part A? (2) 11.6 What type of hole is shown at 2 in Part A? (4) 1.7 Name the type of sectioning at 3 in Part C. (1), 1.8 What is feature 4 in Part C called? (y, 1.9 What is feature 5 in Part C called? ) '1.10 What is feature 6 in Part D called? (1) 1.11 Calculate the exact dimension at 7 in Part I. (1), 1.12 Name the type of sectioning in Part B. (1) 1.13 What is the total height of Part A? (1), 1.14 Which part prevents the coupling from sliding on the shaft? (1) | ANSWER SHEET 14 PART F PART 1. 1.16 In the space below, complete in freehand, the welding symbol indicating a square weld on site. (2) WELDING SYMBOL PART H PART J \ Y a 1.16 In the space below, complete the machining symbol indicating a perpendicular direction of lay using a grinding method to a surface roughness value of 0.2. (3) MACHINING SYMBOL MSIZA ENGINEERING ——__ PARTS UST V DESIGN / MANUFACTURE / ENGINEERING. NO} EARL: QUANTITY Cars N FAX: COUPLING 1 CAST IRON oy uaciwer ei ¢ ||_SHAFT 1 MILD STEEL info@msmzl.co.za 0 ||_GEAR 1 ‘STEEL TITLE: E || BUSH 2 PHOSPHOR BRONZE DRAWN BY: — P SWART GHECKEDBY: FREODIETSHABALALA| INTERMEDIATE F || SPACER 4 PHOSPHOR BRONZE. APPROVED By: partir sl SHAFT AND GEAR G || WASHER: 4 MILD STEEL Bane. DEAN SING SCALE: NTS H || 412 GRUB SCREW 1 MILD STEEL ALL UNSPECIFIED RADW ARE RS; [_1_||_M20HEXAGONALNUT | _1 MILD STEEL ‘TOLERANCES ON ALL. DIMENSIONS ARE: 40,25 WOODRUFF KEY 4 KEY STEEL EXAMINATION NUMBER LI [| [| TTT | | [J 1EB COPYRIGHT © 2019, PLEASE TURN OVER

ANSWER SHEET 2 F180" Zio" 240" 51 e NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DI PAGE 3 OF 6 {QUESTION 2 LOCI CAM The drawings show the following: . an incomplete graph of displacement in position of a rofler-ended follower. * the centre lines of a camshaft. . the shaft and-follower detail at the starting position. ‘The cam imparts the following motion to the follower: . 0° — 60° the follower is at rest. . 60° — 120° the follower rises 28 mm with uniform motion. ° 120° — 165° the follower is at rest. . 165° — 255° the follower falls 56 mm with simple harmonic motion. * 255° 300° the follower is at rest. . 300°— 360° the follower returns to its original position with uniform motion, The cam profile has the following specifications: + The direction of tum is clockwise. . The camshaft has a diameter of 18 mm. 2.4 Draw and hatch the camshaft. 2.2 Draw the roller-ended follower to specification. 2.3 Draw the complete graph of displacement 2.4 Draw the direction of rotation. 2.5 Draw and label all the divisions on the cam profile. 2.6 Draw the cam profile from the displacement graph. 2.7 Label the graph of displacement at A. 2.8 Show all constructions. [ASSESSMENT CRITERIA © Graph & Label 15 * Plot Points 16 * Locus & Construction 4 © Shaft and Hatching 2 2 1 * Direction & Divisions Follower HELE LLL) 40 EXAMINATION N! | 1} j [| J 7 TT] IEB COPYRIGHT © 2019

CONSTRUCTION AREA 1EB COPYRIGHT ©2018 ANSWER SHEET 3 QUESTION 3 DRAWING plane A-A. 3.1 Draw a neat full-sectioned Isometric drawing on cutting-plane A-A. '3.2 Show the construction for the square and any other auxiliary views. '3.3 Draw the centre lines for the circle. 3.4 Make point P the lowest part of your drawing. 3.5 Start your drawing on the given crosshairs. ‘The drawings below show the front view, top view and right view of a CASTING. The CASTING Is cut by cutting. 415 6,20 | boEE4 a * Constructions * Isometric Points 40/2 Isometric Circles * Centre Lines Hatching / Non-Hatching Position noneSr EXAMINATION NUMBER tt] |

NATION INEERING GRAPHICS AND PARTA PART D 4 a +. -—— - i 4 g120 PAGE § OF 6 QUESTION 4 MECHANICAL ASSEMBLY — g PART E PART G M122 GRUB SCREW Figure 1 shows the different parts (not to scale) for an INTERMEDIATE SHAFT AND GEAR that need to be assembled. The exploded front view of how the parts are assembled is also shown. Complete the following on Answer Sheet 4 to a scale of 1:1. Use the given centre jines and point P on the shaft (Part C) as @ reference to plan the drawing layout. 4.1 Draw a haif-sectional front view of the assembled parts on cutting plane A-A, The top half (above the centre line of the shaft) must be In section. 4.2 Draw a right view of the assembled parts, without the coupling (Part B), on the given centre lines. 4.3 Please note the following: 4.3.1 Show 3 faces for the hexagonal nut in the front view. 4.3.2 Show the hidden detail of only the housing (Part A) in the Wight view. 4.3.3 Draw the cutting plane and the missing centre lines. 4.3.4 Insert 3 functional dimensions in the right view. 4.3.5 Draw the projection symbol in the space provided. 4.3.6 Print the title and scate in the space provided. 4.3.7 Correctly label the completed front view. 4.3.8 The gear (Part D) must be drawn in convention. PARTS LIST ] TT * R19} = ' PARTE ‘PARTE PART EXPLODED FRONT VIEW No]| PART |. QUANTITY || MATERIAL } | HOUSING 1 | CAST IRON } | COUPLING | CAST IRON 4 | SHAFT i 1 | MILD STEEL |_ GEAR I | STEEL A B c Do , LE J_BusH m - 2 || PHOSPHOR BRONZE 1 | SPACER 1 | PHOSPHOR BRONZE 1 | WASHER | MILD STEEL | M12GRUBSCREW || |[_MILD STEEL F 6 H 41 ||| M20HEXAGONALNUT || 1 ‘|| MILD STEEL ] J_]|_ WOODRUFF KEY 4 || KEY STEEL. EXAMINATION NUMBER 100 MARKS | 1 [|] [tT J 1EB COPYRIGHT © 2019 PLEASE TURN OVER

NATIONAL SENIOR CERTIFICATE: PAGE 6 OF 6 QUESTION 4 ASSEMBLY ASSESSMENT CRITERIA’ FRONT VIEW HOUSING (141 [COUPLING SHAFT IGEAR BUSHES SPACER WASHER M12 SCREW M16 NUT KEY OTAL| 52 ]-|Z\O|\TM/o|O|w)> /O/n9|N9|1N9| D/O |e 00 4 RIGHT VIEW HOUSING 7 SHAFT 2 GEAR 2 1 2 6 | WASHER: —|9/0/0|> ' 1 1 | M16 NUT ' HIDDEN DETAIL 12/2) ' Tota | 20 ADDITION CORRECT ASS. HATCHING 14/2 NON-HATCHING 4/2 IAL 3 7 2 CENTRE LINES 8/2) 4 3 4 2 3 DIMENSIONS: CUTTING PLANE 6/2 SYMBOL TITLE/SCALE/LABEL TOTAL | 28 TOTAL | 100 TITLE: " 'YMBOL: EXA ION NUMBI SCALE: MINATI ER ANSWER SHEET 4 | | 1EB COPYRIGHT @ 2019