EGD P2 2017 MG hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 PAGE 1 OF 7 NATIONAL SENIOR CERTIFICATE EXAMINATION 2017 FOR OFFICIAL USE ONLY ENGINEERING GRAPHICS AND DESIGN QUESTION SECTION MARK MODERATED MAXIMUM CODE PAPER 2 1 MECHANICAL ANALYTICAL LOCUS 2.1 CAM MARKS: 200 2.2 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 © 2017 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 2 OF 7 QUESTION 1 Figure A Figure B MECHANICAL ANALYTICAL Answer the following questions neatly and legibly in the space provided: 1 2 1.1 Name the type of hole shown at 1 in Figure A. Counter bore (1) Y 1.2 Name the type of hole shown at 2 in Figure A. Countersunk _______ (1) 1.3 What type of sectioning is shown in Figure B? Removed __________ (1) Y SECTION YY 1.4 Calculate the radius 3 in Figure C. R6 _______________ (1) 1.5 What is feature 4 in Figure C called? Round ____________ (1) 1.6 Which screw in Figure D would fit completely into hole 5 and produce a near flush top surface? B________________ (1) 1.7 Which screw in Figure D would fit completely into Figure C Figure D hole 6 and produce a near flush top surface? C________________ (1) 1.8 What is feature 7 in Figure E called? Fillet ______________ (1) 1.9 What is feature 8 in Figure E called? Taper/chamfer ______ (1) 1.10 Calculate the dimension 9 in Figure E. 54 mm ____________ (1) 1.11 Calculate the diameter 10 of the ball in Figure F. Ø7 _______________ (1) 1.12 Calculate the diameter 11 in Figure F. Ø30 ______________ (1) A B C D E 1.13 What is the thickness of the thread in Figure G? 1 mm/0.6 mm _______ (1) 5 6 1.14 Is the thread in Figure G external or internal? External ___________ (1) 1.15 Calculate the diameter 12 of the circle in Figure H. Ø18 ______________ (1) 2 HOLES Ø12 3 1.16 Calculate the diameter 13 of the circle in Figure H. Ø12 ______________ (1) 1.17 The machining symbol in Figure I shows the following information: (2) Select and circle the correct option. Option Machine allowance Roughness value Direction of lay Finish Figure F A 0.2 0.5 Circular Plating B 0.5 0.2 = Plating 4 114 C 0.2 0.5 Parallel Plating 11 D = 0.2 Perpendicular Plating Ø12 9 1.18 The welding symbol in Figure J shows the following information: (2) Select and circle the correct option. Figure E Option Weld type Site weld Weld all around Process A Bead No Yes Flame 8 8 14 10 10 B Fillet Yes No Arc 10 BALLS Ø7 C Bevel No No Flame ON PCD 21 D Fillet Yes Yes Arc 7 8 Figure I Figure J Ø12 Figure G PLATING Figure H 0.5 ARC M6x1 M12x2 0.2 = 12 8 13 9 EXAMINATION NUMBER ANSWER SHEET 1 IEB COPYRIGHT © 2017 PLEASE TURN OVER

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 3 OF 7 QUESTION 2.1 LOCUS CAM Given is 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. The graph of displacement has the following motion: A DISPLACEMENT GRAPH
0°—120° the follower rises 40 mm with simple harmonic motion. (Given) 0º
120°—150° the follower is at rest. (Uniform motion) 330º 30º
150°—180° the follower rises 20 mm. (Uniform motion)
180°—360° the follower returns to its original position with uniform acceleration and retardation. The cam profile has the following specifications: 300º 60º  The direction of turn is anti-clockwise.  The camshaft has a radius of 9 mm. Draw the following: 2.1.1 the complete graph of displacement. 2.1.2 the cam profile. 30º 90º 150º 210º 270º 330º 2.1.3 the camshaft with hatching. 0º 60º 120º 180º 240º 300º 360º 2.1.4 the wedge-ended follower (to your own appropriate size and measurements). 2.1.5 the direction of rotation. B HORIZONTAL SCALE 7MM = 30º 2.1.6 print, in capitals, the required label at A and the applicable scale at B. 2.1.7 show all constructions. 120º 240º ASSESSMENT CRITERIA GRPH 6 Graph 12/2 6 PLOT Setup/Plot Points 12 12 Locus 2 Shaft and hatch 1 LOC 150º Follower 1 2 210º Direction 1 SHFT Label/Scale 2 1 180º FOL 1 DIR 1 LBL 2 EXAMINATION NUMBER ANSWER SHEET 2.1 IEB COPYRIGHT © 2017 PLEASE TURN OVER

Downloaded from hlayiso.com A DISPLACEMENT GRAPH 0º 330º 30º mark for constr. 300º 60º 30º 90º 150º 210º 270º 330º 0º 60º 120º 180º 240º 300º 360º B HORIZONTAL SCALE 7MM = 30º -1 mark for not PRINTING/CAPS Graph 6 12/2 Setup/Plot 12 120º Locus 2 240º Shaft/hatch 1 Follower 1 Direction 1 Label/Scale 2 25 150º 210º 180º

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 4 OF 7 QUESTION 2.2 LOCUS MECHANISM The given figure shows a wheel, rotating around the centre O, with a rod AD attached to it at point A. Rod BC is pin-jointed at point B and free to move about its anchor point C. Rods AD and DP are fixed at 90°. 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. Show all constructions and indicate the direction correctly. C O A 1 2 B 3 P11 P P1 P10 P2 P9 P3 P4 P8 P5 P7 P6 ASSESSMENT CRITERIA SET 2 Setup 2 Plot Points 11 PTS 11 Direction 1 Locus 1 DIR 1 LOC 1 EXAMINATION NUMBER ANSWER SHEET 2.2 IEB COPYRIGHT © 2017 PLEASE TURN OVER

Downloaded from hlayiso.com Setup 2 Plot P 11 Direction 1 Locus 1 C O A 1 2 B 3 P11 P P1 P10 P2 P9 P3 P4 P8 P5 P7 P6

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES CONSTRUCTION AREA PAGE 5 OF 7 QUESTION 3 ISOMETRIC DRAWING The figure below shows the top view, front view and left view of a heavy duty CASTING. The CASTING 52 has been cut by a cutting plane A-A. 60 Draw the following: 3.1 draw a neat Sectioned Isometric on the cutting plane A-A. 3.2 show the constructions for the hexagon. 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. 80 60 50 SQ 40 Ø32 20 SQ P1 A A 30 40 R20 10 20 20 10 20 P 100 80 40 80 10 ASSESSMENT CRITERIA CON 2 Construction 2 ISOM Iso points 44/2 22 22 Iso circles 4 Centre lines 3 CIRC Hatching 5 4 Non-hatching 2 CLS Positioning 2 3 HAT 5 NON 2 P POS 2 EXAMINATION NUMBER ANSWER SHEET 3 IEB COPYRIGHT © 2017 PLEASE TURN OVER

Downloaded from hlayiso.com Construction 2 Iso points 22 44/2 Iso circles 4 Centre lines 3 Hatching 5 Non-hatch 2 Positioning 2 52 60 P

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE: ENGINEERING GRAPHICS AND DESIGN: PAPER 2 — MARKING GUIDELINES PAGE 7 OF 7 QUESTION 4 MECHANICAL ASSEMBLY A 70 A GATE FRAME8/2 4 B CRADLE 12/2 6 C M6 SCREW 4 D M12 BOLT 12/2 6 E WASHER 2 70 F M12 NUT 5 G WHEEL 18/2 9 H BEARINGS 8 44 A GATE FRAME 5 B CRADLE 10/2 5 E WASHER 2 D/F M12 NUT/BOLT 8 G WHEEL 2 HIDDEN DETAIL 6 28 CORRECT ASS. 8/2 4 HATCHING 14/2 7 NON-HATCHING 3 CENTRE LINES 3 DIMENSIONS 3 CUTTING PLANE 2 Ø84 SYMBOL 2 A TITLE/SCALE 2 SECTIONED FRONT VIEW TO AA LABEL 2 SECTION AA 28 100 TITLE GATE WHEEL SYMBOL SCALE I:l EXAMINATION NUMBER ANSWER SHEET 4 IEB COPYRIGHT © 2017

Downloaded from hlayiso.com Sectioned front view Gate frame 4 8/2 Cradle 6 12/2 M6 screw 4 4 A M12 bolt 6 12/2 70 Washer 2 M12 nut 5 5 Wheel 9 18/2 Bearings 8 44 70 Right View for spacing/direction Gate frame 5 Cradle 5 10/2 Washer 2 M12 Nut/bolt 2 8 4 Wheel 2 Hid. Detail 6 28 Additional Corr. Ass. 4 8/2 Hatching 7 14/2 2 2 2 Non-hatching 3 5 Centre lines 3 2 Dimensions 3 Cutting plane 2 Symbol 2 Title/Scale 2 Label 2 28 Ø84 100 A SECTIONED FRONT VIEW TO AA SECTION AA TITLE GATE WHEEL SYMBOL SCALE I:l