EGD P2 Memo 2018 hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES. PAGE 10F 6 fo matters NATIONAL SENIOR CERTIFICATE EXAMINATION 2018 ENGINEERING GRAPHICS AND DESIGN MARKING GUIDELINES PAPER 2 MARKS: 200 TIME: 3 HOURS This question paper consists of 6 pages, including the cover page and 4 questions. All questions must be answered. Unless specified otherwise, all questions are in third-angle orthographic projection. Unless specified otherwise, all questions are to be completed to a scale of 1:1. All answer sheets must be re-stapled in numerical order and handed in, even unanswered questions. All construction work must be shown, even if a stencil was used. Print your examination number neatly on each page. Use only the answer sheets provided. Your drawings should be well presented and reflect neatness and accuracy. Marks will be deducted for untidy and inaccurate work. All dimensions or detail not given may be assumed in good proportion. Stencils and calculators may be used. All drawings must adhere to the SANS 10111-1. In order to save time, detailed assembly parts must be drawn to convention. LL FOR OFFICIAL USE ONLY question] SECTION | 1 MECHANICAL ANALYTICAL | mark — |[MODERATED|[MaximuMl| CODE iJ | | | 20 LOCI CAM 40 DRAWING 40 MECHANICAL ASSEMBLY 2 3 ISOMETRIC 4 100 100 TOTAL 200 SYMBOL TOTAL 4 00 FINAL CONVERTED MARK CHECKED BY EXAMINATION NUMBER | IEB COPYRIGHT © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 20F 6 PART A PART D 10x B10 BALLS QUESTION 1 MECHANICAL ANALYTICAL STUDY THE ADJACENT DRAWING AND ANSWER THE QUESTIONS THAT FOLLOW: 1.1 What scale is indicated for the drawing? SCALE 1:2 11 1.2 How many parts make up the belt tensioner? 13 1 4.3 What material is used for the bearing? STEEL 1 1.4 What should all unspecified radii be? R3 1 the diameter of the balls for the bearing? 10 1 feature 1 in Part A called? KEY SLOT / KEY WAY 4 1.7 What is feature 2 in Part A called? FILLET 1 1.8 Name the type of sectioning at 3 in Part A. REVOLVED SECTIONING 1 4.9 What is feature 4 in Part B called? CHAMFER 4 1.10 What type of hole is shown by feature 5 in Part K? BLIND HOLE 4 1.11 Explain the meaning of feature 6 in Part K. SYMMETRICAL 4 1.12 What does the abbreviation "PCD" in Part D stand for? PITCH CIRCLE DIAMETER 1 1.13 How many surfaces in Part A need to be machined? 6 4 1.14 Name the type of sectioning at 7 in Part J. PARTIAL/ PART SECTIONING] 1 4.15 Calculate the exact dimension at 8 in PartI. 12.8 41 1.16 What is the length of the shaft? 152 1 1.17 Which part prevents the shaft from turning in the frame? KEY / PARTG 4 3 1.18 In the space below, draw in NEAT freehand, a welding symbol indicating a fillet weld all round. WELDING SYMBOL v v v PARTS LIST WN.BY: BERNARD JAMESON | TITLE: CHECKED BY: AMINA NADAR ae QUANTITY ]|___MATERIAL APPROVED BY: FRANCO BELT TENSIONER FRAME. d CAST IRON DATE: 18 NOVEMBER 2017 1 CAST IRON SIGNED: CARLOS MOLELE SCALE 1:2 1 J[HIGH-TENSILE STEEL [~;i7 TNSPECIFIED RADITARE Ra. 2 STEEL TOLERANCES ON ALL DIMENSIONS ARE: £0.25 E || SPACER 1 4 [PHOSPHOR BRONZE _ | F || SPACER2 4 [PHOSPHOR BRONZE _|| FIC ENGINEERING G | KEY 1 [witb STEEL DESIGN ENGINEERING. _# JL washer 4 MILO STEEL __| TEL: 0215551234 283DELFIPLACE P.O. BOX 1832 [_1 [M16 HEXAGONAL NUT J__1 ‘MILD STEEL FAX: 0215551235 DELFI RD CAPE TOWN Mi2 THREADED PIN |__2 MILD STEEL Ganryoepeoea eTown ei) BASE L141 ]LCAST IRON __ | info@ficeng.co.za 20 MARKS EXAMINATION NUMBER | |_| ANSWER SHEET 1 TT | IEB COPYRIGHT ©2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES. PAGE 3 0F 6 A DISPLACEMENT GRAPH © 360° | * ° —_ E 330° 4 30° 7 e —S [o} i | {# le | @ i} — tJ v i —~ ~ \ r= <= - rs E 0 j — fe ls uy 300° LI 60° S| 7 4 on! = \ AN le [ 4,0 y << L Re ¥ \ 0% 30° 60° 90° 120° 150° 180° 210° 240° 270° 300° 330° 360° ¥ a ee o! \ \ B ‘SCALE 8mm =30° © 270°| | fi. v 7 — +} — 90" ¥ —~ | yf \ ; | / ’ ' / | / 120° 240° d / ' (- y | 210° i WA Ad ¥ 180° (QUESTION 2 LOCI CAM The incomplete graph of displacement of a wedge-ended follower as well as the centre of the camshaft, as shown by the given centre lines, is given. The cam imparts the following motion to the follower: . 0°-90° the follower rises 30 mm with uniform motion. . 90°-180° the follower rises 30 mm with simple harmonic motion. . 180°—-360° the follower returns to its with uniform acceleration and retardation. The cam profile has the following specifications: . The direction of turn is anti-clockwise. . The camshaft has a diameter of 22 mm. 2.1 Draw the complete graph of displacement. 2.2 Draw the cam profile from the displacement graph. 2.3 Draw and hatch the camshaft. 2.4 Draw the wedge-ended follower (to your own appropriate size and measurements) 2.5 Draw the direction of rotation. 2.6 Print, in capitals, the required label for the graph of displacement at A, the horizontal scale at B and the 2.7 Show all constructions. 2.8 Draw and label all the divisions on the cam profile. * Graph 20/2 =10 » Plot Points 15 * Locus 3 Shaft and Hatching 2 rection 1 * Follower 2 * Label, constructions & scale 7 EXAMINATION NUMBER ANSWER SHEET 2 [J td IEB COPYRIGHT © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 40F 6 CONSTRUCTION AREA ANSWER SHEET 3 QUESTION 3 The figure below shows the front view, top view and right view of a CASTING. The CASTING is cut by cutting-plane A-A. 3.1 Draw a neat half-sectioned isometric drawing on cutting-plane A-A. 3.2 Show the construction for the hexagon 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. * Centre Lines # Hatching / Non-Hatching NvVNaSw * Positioning 40 MARKS EXAMINATION NUMBER i) IEB COPYRIGHT ©2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 5 OF 6 FIGURE 1 MECHANICAL ASSEMBLY PART A PART D PARTG 2 10x G10 BALLS 26 | ON PCD 34 28 ro osx6 | [| “| PART H = ate 2 @30 16 | PARTI BY E24 "| PCD 90 5, 2 62. 48 A PART PARTE Pane Figure 1 shows the different parts (not to scale) for a BELT TENSIONER that needs 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 lines and point P on the shaft (Part C) as a reference to plan the drawing layout, 4.1 Draw a full sectional front view of the assembled parts on cutting plane A-A, 4.2 Draw an outside right view of the assembled parts on the given centre lines. 4.3 Please note the following: 4.3.1 Show 3 faces of the hexagonal nut in the front view. 4.3.2 Show the hidden detail of only the frame (Part A) in the right view. 4.3.3 Draw the cutting plane and the missing centre lines. 4.3.4 Insert 3 functional dimensions in the front view. 4.3.5 Draw the projection symbol in the space provided. 4.3.6 Print the title and scale in the space provided. 4.3.7 Correctly label the completed front view. 4.3.8 The bearings (Part D) must be drawn in convention, parte PARTI PARTH PART A PARTS LIST ] [No] PART ~_]Lquantity |[ MATERIAL | FRAME 4___|[CASTIRON | [_B || GEAR 1 __ || CASTIRON | [_c ][_SHAFT 4 |HIGH-TENSILE STEEL_| (D |_BALL BEARING 2 || STEEL | E |[ SPACER 1 4 || PHOSPHOR BRONZE _ | F || SPACER 2 1 | PHOSPHOR BRONZE _ | (G | key 4 | MILD STEEL ‘| H || WASHER 4 |[ MILD STEEL | T | M1GHEXAGONALNUT ||__1 _|[ MILD STEEL | EXAMINATION NUMBER 100 MARKS | |_| [EB COPYRIGHT © 2018 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 6 OF 6 a a 66 V QUESTION 4 a [Crssenotr | 7 Da [ASSESSMENT CRITERIA| A FRONT VIEW ra Ch A|FRAME — 262/13/A A ig! NA B |GEAR Bia A YN 6 Wp NY G [SHAFT g|V V7 = Digearincs [8/0 Vv OO + IE/F| SPACERS 410 _ Pf VEZ SIE ie) 7 + | H [WASHER 110 Vv Vv c5 [| |M16 NUT 5\¥v @} we INTTHREAD | 2] A NI S TOTAL] 52 4 NS A i, Ne RIGHT VIEW ——a _ Ad A [FRAME TV ae | B GEAR 210 - A IE/F|SPACER: 1\> v A C|SHAFT 310 4 7 H|WaASHER 4 ~ T [até nut 2\¥ “e HIDDEN DETAIL 6/4 3/4) = TOTAL | 19 + ADDITIONAL, A correctass. [3// wD HATCHING 16/2 8 @ A NON-HATCHING 8/2] 4 |ef> L 4 [A CENTRELINES 4/2] 2|_s Aa A Aa AV DIMENSIONS 3\Vv A © cuttin PLANE | 4/Y ees Gey Cee ~“+-—- 8 —_— o> pe SYMBOL 472| 21/7 Row aN TITLE/SCALEMLABEL| 3|/ BW wy TOTAL | 29 TOTAL A Aa A y 100 [SECTIONAL FRONT VIEW ON A-A/ SECTION A-A|¥ Fa 7 Vv Iv TTLE: BELT TENSIONER Wa SYMBOL; EXAMINATION NUMBER SCALE: SCALE 11 ¥ ANSWER SHEET 4 IEB COPYRIGHT © 2018