EGD P2 MG 2016 hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 PAGE 1 OF 7 NATIONAL SENIOR CERTIFICATE EXAMINATION 2016 FOR OFFICIAL USE ONLY ENGINEERING GRAPHICS AND DESIGN QUESTION SECTION MARK MODERATED MAXIMUM CODE PAPER 2 1 MECHANICAL ANALYTICAL LOCUS 2a CAM MARKS: 200 2b LOCUS MECHANISM TIME: 3 HOURS 3 ISOMETRIC DRAWING PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 4 MECHANICAL ASSEMBLY 1. This question paper consists of 7 pages including the cover page and 4 questions. SYMBOL 2. 3. All the questions must be answered. Unless specified otherwise, all questions are in Third Angle Orthographic Projection. TOTAL 200 4. Unless specified otherwise, all questions are to be completed to a scale of 1:1. 5. All answer sheets must be stapled in numerical order and handed in, even unattempted/blank questions. TOTAL 100 6. All construction work must be shown, even if a stencil was used. FINAL CONVERTED MARK CHECKED BY 7. Print your examination number neatly on each page. 8. Use only the answer sheets provided. 9. Your drawings should be well presented and reflect neatness and accuracy. Marks will be deducted for untidy and inaccurate work. 10. Any dimensions or detail not given may be assumed in good proportion. 11. Stencils and calculators may be used. 100 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 IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 MARKING GUIDELINES PAGE 2 OF 7 QUESTION 1 MECHANICAL Figure A Figure B ANALYTICAL Answer the following questions and print the correct answer in the space provided. 1.1 Which sectioned side view in Figure A is correct to convention? B _______ (1) 1 1.2 What is feature 1 in Figure B called? Round ____________ (1) Ø18 1.3 What is feature 2 in Figure C called? Fillet ______________ (1) 1.4 What type of sectioning is shown by 3 in Figure C? Revolved section ____ (1) 1.5 Calculate the dimension 4 in Figure C. Ø8/R4 ____________ (1) 1.6 Calculate the dimension 5 in Figure C. Ø90/PCD 90 _______ (1) 1.7 Calculate the dimension 6 in Figure D. Ø12 ______________ (1) 10 BALLS Ø8 ON PCD 28 1.8 Calculate the dimension 7 in Figure D. Ø27 ______________ (1) A B C D Ø60 1.9 Calculate the dimension 8 in Figure D. 14.4 mm/14 mm ____ (1) 1.10 Calculate the dimension 9 in Figure E. 185 mm ___________ (1) 1.11 What is feature 10 in Figure E called? Keyway/keyseat ____ (1) 1.12 What type of sectioning is shown by 11 in Figure C? Partial/Part section __ (1) 1.13 Calculate the dimension 12 in Figure F. Ø114 _____________ (1) Figure C Figure D 1.14 Is the thread in Figure E internal or external? External ___________ (1) 1.15 Figure G shows a machining symbol. Complete the table below by printing the correct letter next to the corresponding phrase. (3) 8 M18x3 Phrase Letter 1.15.1 Production method C 1.15.2 Direction of lay D 4 2 6 7 1.15.3 Machine allowance A 12 HOLES Ø8 3 ON PCD 90 1.16 Figure H shows a welding symbol. Complete the table below by printing the correct letter next to the corresponding phrase. (3) Phrase Letter 1.16.1 Weld all around G 5 Figure F 1.16.2 Welding process E 1.16.3 Welding symbol H Ø122 Figure E Figure G Figure H 10 F G Ø130 9 C E B HONING ARC 0.4 A D H I 0.8 M 11 M18x3 61 25 25 68 8 12 EXAMINATION NUMBER ANSWER SHEET 1 IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 MARKING GUIDELINES QUESTION 2a PAGE 3 OF 7 LOCUS CAM Given is the incomplete graph of displacement of a wedge-ended follower as well as the centre of the cam shaft as shown by the given centrelines. The graph of displacement has the following motion: DISPLACEMENT GRAPH/DIAGRAM
0° -45° the follower is at rest. (Given) 0º 45º (Uniform motion)
45° -60° the follower falls 20 mm. 30º 330º (Uniform motion)
60° -90° the follower is at rest. (Uniform motion) 45º
90° -120° the follower falls 20 mm. (Uniform motion)
120° -150° the follower is at rest. (Uniform motion)
150° -180° the follower falls 20 mm. 60º 300º (Uniform motion)
180° -360° the follower returns to its original position with simple harmonic motion. The cam profile has the following specifications: 30º 90º 150º 210º 270º 330º  The direction of turn is clockwise. 0º 60º 120º 180º 240º 300º 360º  The camshaft has a radius of 11 mm. Draw the following: HORIZONTAL SCALE 7MM = 30º 2a.1 the complete graph of displacement. 2a.2 the cam profile. 2a.3 the wedge-ended follower (to your own appropriate size and measurements). 2a.4 the camshaft. 2a.5 the direction of rotation. 2a.6 show all constructions. 2a.7 label the graph of displacement and the horizontal scale. 120º 240º ASSESSMENT CRITERIA GRPH 6½ Graph 13/2 6½ 150º 210º Label/Scale 2 LBL Setup/Plot Points 13/2 6½ 2 Shaft and hatch 2 PLOT Direction 1 6½ 180º Locus 1 Follower 1 SHFT 2 DIR 1 L/F 2 EXAMINATION NUMBER ANSWER SHEET 2a IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 MARKING GUIDELINES PAGE 4 OF 7 P3 QUESTION 2b P2 LOCUS MECHANISM The given figure shows a wheel, rotating around P1 the centre O, with a rod AB attached to it at point A. The end of the rod (B) is attached to a second rod (BC) that is free to move about its anchor point C. Rod BC rocks back and forth as the wheel rotates. 3 Construct and draw the locus of point P if the direction of rotation is clockwise. P 2 Show all constructions and indicate the direction correctly. 1 A O B C ASSESSMENT CRITERIA SET 5 Setup 5 Plot Points 11 PTS 11 Direction 1 Locus 3 DIR 1 LOC 3 EXAMINATION NUMBER ANSWER SHEET 2b IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 MARKING GUIDELINES QUESTION 3 PAGE 5 OF 7 ISOMETRIC DRAWING The figure below shows the front view and right view of a heavy duty BRACKET. The BRACKET has been cut by a cutting plane A-A. Draw the following: 3.1 draw a neat Sectioned Isometric on the cutting plane A-A. 3.2 show the constructions for the hexagon and the angle in the given area. 3.3 draw all centrelines. 3.4 make point P the lowest part of your drawing. 3.5 start your drawing on the given crosshairs. 16 48 16 15 A 12 85 R12 30 40 15 ° 60 85 30° 8 CONSTRUCTION AREA P A P1 20 40 20 15 CON 4 P ASSESSMENT CRITERIA ISOM 22 30 Constructions 4 CIRC Iso points 22 6 Iso circles 6 Centrelines 3 CLS Hatching 3 3 Non-hatching 2 HAT Positioning -2 3 34 NO-H 2 52 POS -2 20 EXAMINATION NUMBER ANSWER SHEET 3 IEB COPYRIGHT © 2016 PLEASE TURN OVER

NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 Downloaded from hlayiso.com PAGE 6 OF 7 QUESTION 4 FIGURE 1 MECHANICAL PART A PART E ASSEMBLY 12 8 80 8 12 A Figure 2 shows a series of pictures of a bicycle 7 Ø110 Ø122 REAR HUB, as well as an exploded view of how the components of a similar, simplified system are assembled. A list of components is also shown. R12 Figure 1 shows the different components (not 45° Ø40 drawn to scale) that need to be assembled. 12 HOLES Ø8 ON PCD 90 3 4 Complete the following to a SCALE of 1:1: Y Ø50 Ø40 45° Ø18 4.1 A sectioned Front View of the assembled Ø130 components on the cutting plane A-A. 4.2 A Right View of the assembled Ø18 components. R5 4.3 Please note the following: Ø70 4.3.1 Point Y on the hub (Part A) must be assembled on Point X of the shaft (Part B). 8 A 4.3.2 Point Y indicates the midpoint. Ø72 4.3.3 Show 3 faces for the hexagonal nuts on PART D the front view. 12 4.4 Show hidden detail on the right view of R3 only the Dust Cover (Part D) and Key (Part F). Ø18 4.5 Draw the cutting plane and the centrelines. 3 4.6 Draw 3 functional dimensions. PART B 4.7 Draw the projection symbol in the space provided. 4.8 Print the title and scale in the space provided. 4.9 Label the sectioned view. 185 33 3 4 x FIGURE 2 Ø60 61 25 25 68 M18x3 15 PART C Ø40 Ø18 COMPONENT LIST 11 NO. PART QUANTITY MATERIAL A HUB 1 STAINLESS STEEL B SHAFT 1 MILD STEEL 10 BALLS Ø8 ON PCD 28 C BEARING 2 MILD STEEL FRONT VIEW 12 D DUST COVER 2 MILD STEEL PART E E GEAR 1 MILD STEEL PART A PART F PART G PART H PART D F KEY 1 STEEL PART D PART C PART C PART B PART F PART H PART G PART G PART H Ø18 Ø36 M18x3 G WASHER 2 MILD STEEL Y x H M18 NUT 2 MILD STEEL 7 6 4 3 EXAMINATION NUMBER IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 MARKING GUIDELINES PAGE 7 OF 7 QUESTION 4 MECHANICAL ASSEMBLY A A HUB B SHAFT 8 C BEARINGS D DUST COVERS E GEAR F KEY G WASHERS H M18 NUTS R12 M18x3 E GEAR F KEY G WASHER H M18 NUT B SHAFT HIDDEN DETAIL CORRECT ASS. HATCHING NON-HATCHING SECTIONED FRONT VIEW TO AA CENTRELINES 8/2 SECTION AA DIMENSIONS A CUTTING PLANE SYMBOL TITLE/SCALE LABEL TITLE REAR HUB SYMBOL SCALE I:l EXAMINATION NUMBER ANSWER SHEET 4 IEB COPYRIGHT © 2016