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

Downloaded from hlayiso.com ISEBE LEMFUNDO LEMPUMA KOLONI EASTERN CAPE EDUCATION DEPARTMENT OOS-KAAP ONDERWYSDEPARTEMENT NATIONAL SENIOR CERTIFICATE GRADE 12 ENGINEERING GRAPHICS AND DESIGN P2 SEPTEMBER 2021 PREPARATORY EXAMINATION MARKING GUIDELINE MARKS: 200 TIME: 3 hours This marking guideline consists of 7 pages. Copyright reserved

Downloaded from hlayiso.com Engineering graphics and design / P2 NSC EC / September 2021 QUESTION 1: ANALYTICAL (MECHANICAL) ANSWERS OREGON MECHANICAL 1 1 MANUFACTURES 2 5 LEOPOLD STREET 1 3 DHLABA 1 4 S-BREAK 1 5 10 1 6 300 X 3 = 900 2 7 KNURLING (DIAMOND) 1 8 HALF SECTION 1 9 PART SECTION 1 10 PITCH CIRCLE DIAMETER 1 11 6 1 12 Ø10,1 1 COIL SPRING AND HOLES IN JAWS. 13 2 NO. 14 TAPER 1 15 DEPTH OF THREAD 1 16 4½ 1 2015. THE DESIGN IS COPY 17 2 PROTECTED. 18 3 19 4 TOTAL 27 ANSWER 18 FH ANSWER 19 FH 2 Copyright reserved Please turn over

Engineering graphics and design / P2 NSC EC / September 2021 QUESTION 2.1: LOKUS (CAM) ü HORIZONTAL PROJECTION x ü CIRCLE + DIVIDING 6 DIVIDING LINES v w v x v x ü CURVE v ü CURVE x 6 EQUAL PARTS + v CONSTRUCTION x v üü v v x x 0° 30° 60° 90° 120° 150° 180° 210° 240° 270° 300° 330° 360° ASSESSMENT CRITERIA y CAM DISPLACEMENT DIAGRAM ü 1 CONSTRUCTION 2 y SCALE 360° = 120 MM 1ST DWELL + üv 2 SIMPLE HARMONIC 7 Downloaded from hlayiso.com ü 120MM 3 1 w 2ND DWELL 2 ü DIVIDED INTO 12 EQUAL PARTS 4 ACCELERATION AND 621 üx RETARDATION y 5 LABEL + SCALE 1 SUB-TOTAL 2.1 17 3 Copyright reserved Please turn over

Engineering graphics and design / P2 NSC EC / September 2021 QUESTION 2.2: LOCI (MEGANISMES) 1 1 w 11 X 2 = 52 ü ü 6 EQUAL E PARTS ü x C x x ü ü B D x u ü CURVE QUALITY x x x ü x x x x x A ASSESSMENT CRITERIA CONSTRUCTION OF uü 1 DIAGRAM 421 DIVIDING CIRCLE INTO Downloaded from hlayiso.com ü CONSTRUCTION OF 6 ü 2 EQUAL PARTS 2 12 EQUAL PARTS CONSTRUCTION OF wü 3 LOCI 521 xü 4 LOCI OF POINT E 7 SUB-TOTAL 2.2 19 4 Copyright reserved Please turn over

Engineering graphics and design / P2 NSC EC / September 2021 QUESTION 3: ISOMETRIC x x x x x x x x x y y v x z v z ü z z v x y v ü v x y x y z x v ASSESSMENT CRITERIA H H w v y z w ü 1 CONSTR' + PLACEMENT 3 v z H w w v 2 ISOMETRIC LINES 10 w v w 3 RIB 5 v v v v w w Downloaded from hlayiso.com v w 4 HEXAGON 7 x y H v z v z y 5 HALF CIRCLE 321 v w w H zH 6 SECTION + HATCHING 821 v v z v z z TOTAL 37 y Sü 5 Copyright reserved Please turn over

Engineering graphics and design / P2 NSC EC / September 2021 QUESTION 4: MECHANICAL ASSEMBLY HALF SECTIONAL FRONT VIEW OF CUTTING PLANE A-A u u w u H w w v u H u uv v u u v vv w v v v v u Hu v H v u u v v v u u u uv v v ASSESSMENT CRITERIA w w w HALF SECTIONAL H FRONT VIEW (TOP) wx | { 1 HANDLE 9 z | H üu H z z H { y H x x x | 2 SCREW 921 y H H y vH y w x y y 3 CRANK 821 yy H y y y y wH yyyy yH y x 4 BUSH 521 w y xH y H H y H Downloaded from hlayiso.com yz H w x | yH 5 SHAFT 12 x { {H { w H 6 CIRCLIP 221 w x | | { zH | | {H 7 INTPUT GEAR 5 |H 8 HOUSING (TOP PART) 5 6 Copyright reserved Please turn over

Engineering graphics and design / P2 NSC EC / September 2021 QUESTION 4: MECHANICAL ASSEMBLY 14 14 HALF SECTIONAL FRONT VIEW OF CUTTING PLANE A-A CL 14 14 14 14 CL CL 14 CL 14 14 CL 14 H CL 14 CL ” 14 S 11“ ” ” “ 12 H 1212 11 11 “ “ “ • • • “ 12 ASSESSMENT CRITERIA •• 12 “ “ “ 12 •• 12H 12 ü H HALF SECTIONAL •• 12 12 H “ “ “ FRONT VIEW (BOTTOM) 12 11 “ HOUSING • “H 8 (BOTTOM PART) 1121 H ”H 9 OUTPUT GEAR 4 ” • ”H 10 CRANKSHAFT 721 “ “ H •H “ “ • 11 H 11 WASHER 221 “ • 12 M12 NUT 7 H ü 12 H “ CENTRE LINES Downloaded from hlayiso.com “ CL 13 321 “ S HALF SECTIONAL FRONT VIEW 15 14 ASSEMBLY 6 ü 14 SCALE 1 : 1 15 15 15 LABEL AND SCALE 1 TOTAL 100 7 Copyright reserved