EGD P2 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 20 LOCUS 2a CAM 20 MARKS: 200 2b LOCUS MECHANISM 20 TIME: 3 HOURS 3 ISOMETRIC DRAWING 40 PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 4 MECHANICAL ASSEMBLY 100 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 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? _________ (1) 1 1.2 What is feature 1 in Figure B called? _________________ (1) Ø18 1.3 What is feature 2 in Figure C called? _________________ (1) 1.4 What type of sectioning is shown by 3 in Figure C? _________________ (1) 1.5 Calculate the dimension 4 in Figure C. _________________ (1) 1.6 Calculate the dimension 5 in Figure C. _________________ (1) 1.7 Calculate the dimension 6 in Figure D. _________________ (1) 10 BALLS Ø8 ON PCD 28 1.8 Calculate the dimension 7 in Figure D. __________________ (1) A B C D Ø60 1.9 Calculate the dimension 8 in Figure D. _________________ (1) 1.10 Calculate the dimension 9 in Figure E. _________________ (1) 1.11 What is feature 10 in Figure E called? _________________ (1) 1.12 What type of sectioning is shown by 11 in Figure E? _________________ (1) 1.13 Calculate the dimension 12 in Figure F. _________________ (1) Figure C Figure D 1.14 Is the thread in Figure E internal or 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 1.15.2 Direction of lay 4 2 6 7 1.15.3 Machine allowance 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 5 Figure F 1.16.2 Welding process 1.16.3 Welding symbol 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 20 MARKS EXAMINATION NUMBER ANSWER SHEET 1 IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 PAGE 3 OF 7 QUESTION 2a 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:
0° -45° the follower is at rest. (Given) 0º (Uniform motion) 45º
45° -60° the follower falls 20 mm. (Uniform motion)
60° -90° the follower is at rest. (Uniform motion)
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. (Uniform motion)
180° -360° the follower returns to its original position with simple harmonic motion. The cam profile has the following specifications:  The direction of turn is clockwise. 30º 90º 150º 210º 270º 330º  The camshaft has a radius of 11 mm. 0º 60º 120º 180º 240º 300º 360º Draw the following: 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. ASSESSMENT CRITERIA GRPH 6½ Graph 13/2 6½ Label/Scale 2 LBL Setup/Plot Points 13/2 6½ 2 Shaft and hatch 2 PLOT Direction 1 6½ Locus 1 Follower 1 SHFT 2 DIR 1 L/F 2 20 MARKS EXAMINATION NUMBER ANSWER SHEET 2a IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 PAGE 4 OF 7 QUESTION 2b LOCUS MECHANISM The given figure shows a wheel, rotating around 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. Construct and draw the locus of point P if the direction of rotation is clockwise. P Show all constructions and indicate the direction correctly. A O B C ASSESSMENT CRITERIA SET 5 Setup 5 Plot Points 11 PTS Direction 1 11 Locus 3 DIR 1 LOC 3 20 MARKS EXAMINATION NUMBER ANSWER SHEET 2b IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 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 Constructions 4 CIRC Iso points 22 6 Iso circles 6 Centrelines 3 CLS Hatching 3 3 Non-hatching 2 HAT Positioning -2 3 NO-H 2 POS -2 40 MARKS 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 100 MARKS IEB COPYRIGHT © 2016 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 PAGE 7 OF 7 QUESTION 4 MECHANICAL ASSEMBLY A HUB 20 B SHAFT 5 C BEARINGS 6 D DUST COVERS 6 E GEAR 4 F KEY 1 G WASHERS 4 H M18 NUTS 6 52 E GEAR 9 F KEY 1 G WASHER 1 H M18 NUT 2 B SHAFT 2 HIDDEN DETAIL 3 18 CORRECT ASS. 3 HATCHING 9 NON-HATCHING 4 CENTRELINES 8/2 4 DIMENSIONS 3 CUTTING PLANE 2 SYMBOL 2 TITLE/SCALE 2 LABEL 1 30 TITLE 100 SYMBOL SCALE EXAMINATION NUMBER ANSWER SHEET 4 100 MARKS IEB COPYRIGHT © 2016