Engineering Graphics and Design Grade 12 P2 2021 QP (Eng)

Downloaded from hlayiso.com INSTRUCTIONS AND INFORMATION ISEBE LEMFUNDO LEMPUMA KOLONI EASTERN CAPE EDUCATION DEPARTMENT OOS-KAAP ONDERWYSDEPARTEMENT FOR OFFICIAL USE ONLY MODERATED NATIONAL SENIOR CERTIFICATE MARK 1 2 3 4 GRADE 12 TOTAL 2 0 0 2 0 0 FINAL CONVERTED CHECKED BY MARK ENGINEERING GRAPHICS AND DESIGN P2 SEPTEMBER 2021 100 COMPLETE THE FOLLOWING: PREPARATORY EXAMINATION NAME NAME MARKS: 200 *GRDSE2* EXAMINATION CENTRE TIME: 3 hours This question paper consists of 6 pages. SCHOOL Copyright reserved Please turn over 1

Engineering graphics and design / P2 LE Ø36 Ø9 Downloaded from hlayiso.com NSC QUESTION 1: ANALYTICAL (MECHANICAL) EC / September 2021 P 7 7 STA EXTENDED COMPRESSED PCD 26 Given: M16 X 1 A detailed drawing of a keyless chuck, a title block, assembled views and a table of questions. The drawings have Ø4 3 9 not been prepared to the indicated scale. 14 Ø1 B B Instructions: 7 25 9 3 Complete the table below by neatly answering the questions, which all refer to the accompanying drawings and the C E title block. [27] Ø20 105 1 X 45º Ø23 Ø12 Ø30 QUESTIONS ANSWERS 18 M34 X 2 F 1 What is the name of the company? 1 40 COIL SPRING COLLAR 17 SCALE 2 : 1 2 In which street is the company based? 1 Ø40 B 3 Who approved the drawing? 1 D 2 Ø36 M16X1 SCALE 1 : 1 4 What is the feature at D called? 1 M34X2 1 X 45º R11 5 How many parts are used to manufacture the chuck? 1 SHAFT 3 6 How many jaws, in total, must be manufactured? 2 16 Ø10 29 12 7 What is the feature at A? 1 0° 50 15° 3 5 Ø3 8 What type of section resulted from cutting plane Z-Z? 1 3 18 6 1 X 45º Ø4 19 30° 22 9 Name the type of section at F. 1 1 X 45º 5 15° 2 Ø22 10 What does PCD mean? 1 COMPRESSED HEADPIECE JAW GUIDE JAW 11 Determine the measurement at E. 1 COIL SPRING Determine the measurement at B if it needs to be 12 1 0,1 mm bigger than the shaft that penetrates it. What was the second correction of the drawing and 13 2 was it corrected? 14 What is the feature at C? 1 15 What does the two, in M34 x 2, mean? 1 Z 16 How many turns does the coil spring have? 1 A When was the keyless chuck patented and what does 17 2 that mean? In the space below (ANSWER 18), draw, in neat freehand, the SANS symbol for a coil 18 spring. 3 Z In the space below (ANSWER 19), draw, in neat freehand, the SANS symbol for the 19 projection system used. 4 VIEW 2 TOTAL 27 ASSEMBLY ANSWER 18 ANSWER 19 5 LEOPOLD STREET OREGON QONCE PARTS LIST 5600 MECHANICAL MANUFACTURES 043 604 8300 TITLE: PART MATERIAL QUANTITY KEYLESS CHUCK 1. COLLAR STEEL 1 3. ALL UNDIMENSIONED RADII ARE R2. ALL DIMENSIONS ARE 2. HEADPIECE STEEL 1 SCALE: NTS 2. INSERT COIL SPRINGS AND MILLIMETRES. HOLES ON THE ISOMETRIC 2021/04/15 3. SHAFT STEEL 1 PROGRAMME: AUTOCAD 2020 VIEW. 4. JAW STEEL 3 FILE NAME: EX127.dwg 1. THREAD NEEDS TO 2021/04/15 APPROVED: DHLABA 2021/05/15 NAME PATENTED: 2015 5. JAW GUIDE MCS 1 BE HATCHED AT SHAFT. CHECKED: BOOYSEN 2021/04/15 QUANTITY: 300 6. COIL SPRING COPPER 3 REVISIONS DATE DRAWN: VELLUM 2020/12/15 NAME 2 Copyright reserved Please turn over

Engineering graphics and design / P2 LE Downloaded from hlayiso.com NSC EC / September 2021 AP QUESTION 2.1: LOCI (CAM) ST Given: x The bottom left 0° starting position of the displacement graph on the answer sheet for a cam. x The specifications of the motion of the cam. Specifications: The cam imparts the following motion to the follower: x The cam dwells for a period of 30°. x It rises 60 mm with simple harmonic motion over the next 180°. x The cam dwells for 60°. x It returns to the original position with uniform acceleration and retardation over the rest of the rotation. Instructions: x Draw, to a displacement scale of 1 : 1 and horizontal scale of 360° = 120 mm, the complete displacement graph for the required motion. x Label the graph and indicate the scale. x Show ALL necessary construction. [17] ASSESSMENT CRITERIA 1 CONSTRUCTION 2 1ST DWELL + 2 SIMPLE HARMONIC 7 0° 3 2ND DWELL 1 2 4 ACCELERATION AND 621 RETARDATION 5 LABEL + SCALE 1 SUB-TOTAL 2.1 17 QUESTION 2.2: LOCI (MECHANISM) Given: E x Figure 1 shows the detail of a camshaft follower AB at its lowest point, connecting rod BE C that is connected onto the camshaft follower AB as well as rotating crank CD. x Figure 2 shows the schematic diagram of the drawing. B x Starting point A of the follower. D Motion: x The follower reciprocates (up and down) on the vertical centre line. x The maximum height the follower moves from point B is 40 mm. x Follower AB moves upwards for the first 6 segments of A the cam until it reaches the maximum height of 40 mm ASSESSMENT CRITERIA from point B. FIGURE 1: x The follower then moves down to the original position 1 CONSTRUCTION OF DIAGRAM 421 for the last 6 segments of the cam. 77 x Rod BE moves as crank CD rotates clockwise around 2 CONSTRUCTION OF 6 2 fixed point D. EQUAL PARTS 38 CONSTRUCTION OF 3 LOCI 521 Instructions: MAX. E x Draw the given schematic diagram (FIGURE 2). x Project and draw the loci of point E to the given 4 LOCI OF POINT E 7 HEIGHT C motion. B 15 D x Show ALL necessary construction. [19] SUB-TOTAL 2.2 19 A SUB-TOTAL 2.1 17 45 41 R15 TOTAL 36 A NAME FIGURE 2: NAME 3 Copyright reserved Please turn over

Engineering graphics and design / P2 LE Downloaded from hlayiso.com NSC QUESTION 3: ISOMETRIC EC / September 2021 AP ST Given: x Three views of a FIGURE in third angle orthographic projection. x Cutting plane A-A as seen in the top view. x Starting point S. Instructions: x Draw, to scale 1 : 1, a sectional isometric view of the FIGURE. x Make point S the lowest point of the drawing. x Show ALL necessary construction. x NO hidden detail is required. [37] 35 20 20 35 A S 10 50 A 26 5 28 58 25 20 S S 5 110 Ø88 26 ASSESSMENT CRITERIA 1 CONSTR' + PLACEMENT 3 2 ISOMETRIC LINES 10 3 RIB 5 S 4 HEXAGON 7 5 HALF CIRCLE 321 6 SECTION + HATCHING 821 TOTAL 37 NAME NAME 4 Copyright reserved Please turn over

Engineering graphics and design / P2 LE Downloaded from hlayiso.com 8 NSC EC / September 2021 AP R15 3 QUESTION 4: MECHANICAL ASSEMBLY ST 30 Given: x The exploded isometric drawing of the parts of a gear drive 83 48 assembly, showing the position of each part relative to the 20 Ø8 Ø44 M8 6 Ø14 M8 25 others. 5 119 x Orthographic views of each of the parts of the gear drive. □10 x Starting point S indicated on the front view of the housing and Ø24 R5 also on the answer sheet, page 6. Ø30 3 R5 15 15 Ø16 51 Instructions: R5 Ø44 x Answer this question on page 6. 15 x Draw, to scale 1 : 1 and in third angle orthographic projection, the following view of the assembled parts of the gear drive. HANDLE (1) CRANK (2) SCREW (3) BUSH (4) x The half sectional front view of the gear drive assembly, on cutting plane A-A, as seen from the direction of the arrow 45 shown on the exploded isometric drawing. The cutting plane is 23 shown on the right view of the housing (part 6). A Ø44 R45 NOTE: 4 Ø24 Ø36 100 □18 x The crank (part 2) and the crankshaft (part 12) must be drawn 53 R2 Ø2 Ø38 4 15 51 22 □10 in their vertical position as seen in the exploded isometric view. R6 28 9 x Show, in the sectional front view, THREE faces of the M12 nut. R4 15 R15 x Show ALL nut construction. †18 Ø46 Ø10 143 x NO hidden detail is required. Ø18 Ø24 2 A Ø8 121 4 x All drawings must comply with the guidelines contained in Ø30 22 Ø16 R6 Ø32 SANS 10111. 83 CIRCLIP (5) 68 Ø12 64 Add the following features on the drawing: 23 x Label the view: HALF SECTIONAL FRONT VIEW 11 S x Indicate the scale [100] 124 90 1 2 HOUSING (6) INPUT GEAR (7) SHAFT (8) 3 TITLE: 2 Ø24 GEAR DRIVE OREGON 5 LEOPOLD STREET Ø76 QONCE 5600 5 MECHANICAL MANUFACTURES 043 604 8300 4 Ø12 10 ALL DIMENSIONS ARE MILLIMETRES. Ø60 Ø68 6 †12 22 ALL UNSPECIFIED RADII ARE R3. 9 7 M12 NUT (9) WASHER (10) OUTPUT GEAR (11) PARTS LIST 10 PART MATERIAL QUANTITY CONVENTIONAL METHOD: 1. HANDLE PVC 1 8 21 22 15 †12 Ø18 2. CRANK CAST IRON 1 B 3. SCREW STD 1 4. BUSH COPPER 1 42 M12 5. CIRCLIP STD 1 6. HOUSING CAST IRON 1 8 7. INPUT GEAR ALUMINIUM 1 11 Ø22 61 8. SHAFT STEEL 1 FR S 145 9. M12 NUT STD 1 ON 12 TV 10. WASHER CAST IRON 1 IEW CRANKSHAFT(12) B 11. OUTPUT GEAR ALUMINIUM 1 12. CRANKSHAFT STEEL 1 5 Copyright reserved Please turn over

Engineering graphics and design / P2 LE Downloaded from hlayiso.com NSC EC / September 2021 PENALTIES AP ST 1 WRONG SCALE -2 2 WRONG PLACING OF VIEWS -2 3 PARTS NOT ASSEMBLED -2 4 WRONG HATCHING -2 TOTAL PENALTIES (-) ASSESSMENT CRITERIA HALF SECTIONAL FRONT VIEW 1 HANDLE 9 2 SCREW 921 3 CRANK 821 4 BUSH 521 5 SHAFT 12 6 CIRCLIP 221 7 INTPUT GEAR 5 8 HOUSING 1621 9 OUTPUT GEAR 4 10 CRANKSHAFT 721 11 WASHER 221 12 M12 NUT 7 13 CENTRE LINES 321 14 ASSEMBLY 6 S 15 LABEL AND SCALE 1 TOTAL 100 NAME NAME 6 Copyright reserved