Engineering Graphics and Design Grade 12 P2 2018 QP (Eng)

basic education Department « y) Basic Education "4 REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE i ENGINEERING GRAPHICS AND DESIGN P2 i] i NOVEMBER 2018 MARKS: 100 TIME: 3 hours Copyright reserved This question paper consists of 6 pages. FOR OFFICIAL USE ONLY QUESTION ] MARKS OBTAINED | 3 | SIGN MODERATED |} siGN RE-MARKING | 3] SIGN 1 2 3 . 1 4 1 i TOTAL | ) 2])0/0 2/0/0 2])0/0 FINAL CONVERTED MARK CHECKED BY 100 oe _ INSTRUCTIONS AND INFORMATION This question paper consists of FOUR questions. Answer ALL the questions. ALL drawings are in third-angle orthographic projection, unless otherwise stated. ALL drawings must be prepared using pencil and instruments, unless otherwise stated. ALL answers must be drawn accurately and neatly. ALL the questions must be answered on the QUESTION PAPER, as instructed. ALL the pages, irrespective of whether the question was attempted or not, must be re-stapled in numerical sequence in the TOP LEFT-HAND CORNER ONLY. 8. Time management is essential in order to complete all the questions. 9. Print your examination number in the block provided on every page. 10. Any details or dimensions not given must be assumed in good proportion. ONS NO COMPLETE THE FOLLOWING: CENTRE NUMBER CENTRE NUMBER EXAMINATION NUMBER | | | Barcode label | | | | EXAMINATION NUMBER Please tum over

Engineering Graphics and Design/P2 DBE/November 2018 Downloaded from hlayiso.com Copyright reserved Loy C . QUESTION 1: ANALYTICAL (MECHANICAL) Ug? - \ Given: The front view and top view of a micrometer, sections, a parts list, a title block and a table of questions. The drawing has not been prepared to the indicated scale. - EL Instructions: SECTION S-S SECTION T-T SECTION U-U Complete the table below by neatly answering the questions which refer to the accompanying drawing, title block and mechanical content. [30] u QUESTIONS ANSWERS | 1 | Who prepared the drawing? 1 7 : 2 | On what date was the drawing checked? 1 | 3 | What was Siyabongi's responsibility? 1 a: - z 4 | What is the drawing number? 1 5 | What material is used to manufacture the anvil? 1 : 6 | How many parts make up this micrometer? 1 | 7 | At what temperature will the micrometer be accurate? 1 u 1 8 | What is the maximum size that this micrometer can measure? 1 Why is the shaft at A drawn as a phantom line (double chain 9 |, 1 line)? 10 | What does the S-break at B indicate? 1 8 11 | Give TWO uses of chain lines on mechanical drawings. 2 12 | How many surfaces on this micrometer are knurled? 1 2 64 + 3 13 | What is VIEW 1 called? 1 14 | Determine the complete dimensions at: Cc: D E 5 15 | Measure the angle at F. 1 22 16 | Name the type of section at G. 1 16 17 | Name the type of section at H. 1 18 | Name the type of section at J 2 4g | With reference to the tolerance at K, determine the minimum y dimension. 20 | In the space below (ANSWER 20), draw, in neat freehand, the symbol for the projection system y VIEW 1 used. TOTAL | 30 PARTS LIST DRAWING PROGRAM: AUTOCAD 2018 SCALE 1:1 PART QUANTITY MATERIAL DIMENSIONS ARE ACCURATE AT 20°C | DRAWING NUMBER ANSWER 20: Projection symbol 1 Janvi. 1 TUNGSTEN ACCURACY: 1 TURN OF THE OUTER SLEEVE 0,5 mm 2 | FRAME 1 CAST IRON MEASUREMENT RANGE: MINIMUM = 0,01 & MAXIMUM = 25,00 3 | SPINDLE LOCKNUT 1 TOOL STEEL APPROVED: SIYABONGI DATE: 2018-02-28 4 | INNER SLEEVE 1 TOOL STEEL CHECKED: JACQUES DATE: 2018-02-10 5 | OUTER SLEEVE 1 TOOL STEEL —-—— - —— - —-— - —_ - — DRAWN: WENDY DATE: 2018-01-08 6 | SPINDLE 1 SILVER STEEL EXAMINATION NUMBER 7 | screw 1 TOOL STEEL TITLE MICROMETER 8 | RATCHET 1 TOOL STEEL EXAMINATION NUMBER [2 Please tum over

Engineering Graphics and Design/P2 DBE/November 2018 2D Ce Downloaded from hlayiso.com QUESTION 2: LOCI NOTE: Answer QUESTIONS 2.1 and 2.2. 2.1 CAM Motion: Acam rotates at constant velocity imparting the following motion to a follower: It rises with uniform motion for 21 mm over the first 60°. There is a dwell period for the next 75°. It rises with uniform motion for a further 43 mm over the next 45°. It descends with simple harmonic motion back to the original position over the rest of the rotation. Instructions: * Draw, to a rotational (horizontal) scale of 360° = 114 mm and a displacement scale of 1 : 1, the complete displacement graph for the required motion. * Label the displacement graph and include the scale. Copyright reserved Show ALL construction. [11] ASSESSMENT CRITERIA 2.1 1 | CONSTRUCTION 4 2 | POINTS + CURVE 6 3 | LABELS 1 PENALTIES (-) SUBTOTAL 1 2.2 MECHANISM Given: * Asschematic drawing of a mechanism consisting of crank OA, sliding rod AB, rod CD, horizontal groove FG and swivel guide E * The position of centre point O on the drawing sheet Specifications: © The positions of centre point O, swivel guide E and groove FG are fixed * Sliding rod AB is pin-jointed to crank OA at A * Rod CD is pin-jointed to sliding rod AB at C *CD =90mm Motion: As crank OA rotates in a clockwise direction, point B, of sliding rod AB, reciprocates along groove FG, ASSESSMENT CRITERIA 22 and rod CD slides through swivel guide E 1 | GIVEN 6 Instructions: * Draw, to scale 1: 1, the given schematic | 2 | CONSTRUCTION 5 drawing of the mechanism. 3 |ponrs » CURVE 1a + Trace the loci generated by point C and by point D for ONE complete rotation of crank OA. PENALTIES () 2.2 SUBTOTAL 25 Show ALL construction [25] 2.1 SUBTOTAL 4 TOTAL | 36 EXAMINATION NUMBER EXAMINATION NUMBER [3 Please tum over

cum Downloaded frem hlayiso.com — Ct QUESTION 3: ISOMETRIC DRAWING s Given: ¢ The front view, top view and left view of a bracket © The position of point S on the drawing sheet Instructions: Using scale 1 : 1, convert the orthographic views of the bracket into an isometric drawing. * Make S the lowest point of the drawing. Show ALL construction. « NO hidden detail is required. [38] 20. 42 38 30 i i 3 12 |.18_| 18, 76 ASSESSMENT CRITERIA 1 | PLACEMENT +Aux. view | 2 2 | FRONT PORTION 223 3 | BACK PORTION 5 CIRCLE * CIRCLE 4 | CONSTRUCTION + oL 8 PENALTIES (-) TOTAL | 38 EXAMINATION NUMBER, EXAMINATION NUMBER [4 Please tum over

Engineering Graphics and Design/P2 BUSH [1] 6 a €3) B16 51 pl le. PUMP PLUNGER [4] ™ WORM SHAFT [2] Downloaded from hlayiso.co ‘AN EXAMPLE OF A CONVENTIONAL ae / DETAIL T 250 a4 36 o SPLIT BUSH [6] REPRESENTATION OF A WORM GEAR ASSEMBLY 50 CRANK GEAR [5] SPINS @6 | 20, 8 22 ore T ! ol its s 1 al. 2 12 i g \ T ' -l. 10 A 126 33 34 44). 25 3 HOLES @6 415 EXPLODED ISOMETRIC DRAWING 232 24, Copyright reserved 37 22.2 r2e/ hl a PUMP BODY [9] =e QUESTION 4: MECHANICAL ASSEMBLY Given: * The exploded isometric drawing of the parts of an oil pump assembly, showing the position of each part relative to all the others * Orthographic views of each of the parts of the oil pump assembly # An example of a conventional representation of a worm gear assembly. Instructions: * Answer this question on page 6. Draw, to scale 1 : 1 and in third-angle orthographic projection, the following views of the assembled parts of the oil pump assembly: 4.1 The front view as seen from the direction of the arrow shown on the exploded isometric drawing. 4.2 A sectional right view on cutting plane A-A. The cutting plane, which passes vertically through the oil pump assembly, is shown on the front view of the pump body (part 9). NOTE: * Planning is essential. * The drawing must comply with the guidelines as contained in the SANS 10111. * Show THREE faces of the M14 retaining bolt (part 3) in the front view * Draw a conventional representation of the worm gear assembly in the sectional right view. * Add cutting plane A-A * NO hidden detail is required. [96] PARTS LIST PARTS QUANTITY, MATERIAL 1 | BUSH 1 BRONZE 2 | WORM SHAFT 1 ENS 4 | PUMP PLUNGER 1 BRASS 5 | CRANK GEAR 1 EN 19 6 | SPLIT BUSH 2 BRONZE 8 | COVER PLATE 1 MILD STEEL 101 FLAMINGO BVI INDUSTRIAL PARK www.BVJ.co.za PROJECTS CC ® 012 345 6789 OIL PUMP Please tum over

a Downloaded frem hlayiso.com — FOR OFFICIAL USE ONLY og INCORRECT ORTHOGRAPHIC PROJECTION INCORRECT OVERALL SCALE INCORRECT HATCHING PARTS NOT ASSEMBLED TOTAL PENALTIES (-) ASSESSMENT CRITERIA FRONT VIEW 1 | coverriate 8 2. | pump eooy+ aust 5 3. | WORM SHAFT 23 4 [wererannesorr | 4g SUBTOTAL 20 SECTIONAL RIGHT VIEW 1 | coveruare re 2 | Pump Booy 113 3 | crankcear+snarr | 417 4 | PUMP PLUNGER 7 5 | srureus 3 6 | PUMP HOUSING 10 SUBTOTAL 60 GENERAL 1 | cevreunes 4 2 | SECTIONAA 3 3 | assewsry @ SUBTOTAL 16 TOTAL | 96 PENALTIES () GRAND TOTAL EXAMINATION NUMBER EXAMINATION NUMBER [6