Graphical Communication MGC 110 Grafiese Kommunikasie MGC 110

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1 UNIVERSITY OF PRETORIA UNIVERSITEIT VAN PRETORIA Department of Mechanical and Aeronautical Engineering Departement Meganiese en Lugvaartkundige Ingenieurswese Copyright reserved Kopiereg voorbehou Graphical Communication MGC 110 Grafiese Kommunikasie MGC 110 Examination paper Time: 180 minutes 4 June 2012 Marks: 100 Eksamen vraestel Tyd: 180 minute 4 Junie 2012 Punte: 100 Internal Examiners Lecturers: Mr R.F. Meeser Ms L Smith Interne Eksamineerders Dosente Mnr R.F. Meeser Me L Smith Eksternal Examiner Dr Lee Kim Seng (National University of Singapore) Instructions: Answer all questions The question paper and the multiple choice mark sheet must both be handed in seperately Eksterne Eksamineerder Dr Lee Kim Seng (National University of Singapore) Instruksies: Beantwoord alle vrae Die antwoordblad en die meervuldige keuse merkleesblad moet afsonderlik ingehandig word QUESTION 1: Manufacturing theory [30] TO BE COMPLETED ON THE MULTIPLE CHOICE CHART SIDE 1 FOLLOW THE INSTRUCTIONS ON THE CHART DO NOT MAKE ANY MARK ON THE CHART OUTSIDE THE CIRCLES PROVIDED. You may not mark the answers on your questions paper. Use the space provided on page 6 for your calculations VRAAG 1: Vervaardigings-Teorie [30] VOLTOOI HIERDIE VRAE OP DIE MULTI KEUSE KAART KANT 1 VOLG DIE INSTRUKSIES OP DIE KAART. MOET NIE OP ENIGE ANDER PLEK AS DIE SIRKEL OP DIE KAART ENIGE MERKE MAAK NIE. U mag nie die antwoorde op u vraestel merk nie. Gebruik die deel op bladsy 6 vir rofwerk. NB FORMULAS ON PAGE 10 NB FORMULES OP BLADSY 10 1

2 1.1) Which one of the following is not a machining operation? (2) A. Drilling B. Broaching C. Grinding D. Drawing E. High energy beam machining 1.1) Watter een van die volgende is nie n masjineerings operasie nie? (2) A. Boorwerk B. Trekvrees C. Slyping D. Uittrekking E. Hoë-energie straal masjineering 1.2) The most widely used casting process is (2) A. Sand Casting B. Die Casting C. Lost Wax Casting D. Slush Casting E. Expanded Polystyrene Process 1.2) Die giet proses wat die meeste gebruik word is (2) A. Sandgiet B. Matrysgiet C. Verlore Was giet D. Spoel giet E. Polystyrene proses Figure1.1/Figuur ) You are working at a sheet metal factory, and you have been tasked to do the design of a dustbin as depicted in Figure 1.1. Calculate the staring BLANK size for this dustbin to be used in a drawing operation. You may ignore bend radii. (4) A m B. 0.7m C m D m E m 1.3) U werk by n plaatmetaal fabriek, u was die taak gegee om n asblik soos in Figuur 1.1 te ontwerp. Bereken die begin grootte van die BLANK vir die asblik om gebruik te word in n diep trek proses. U mag die buig radiusse ignoreer. (4) A m B. 0.7m C m D m E m 2

3 1.4) Would this drawing operation be feasible in one single drawing step? (2) A. Yes B. No 1.4) Sou die operasie prakties uitvoerbaar wees vir n enkele trek aksie? (2) A. Ja B. Nee 1.5) Calculate the force required to at once punch out one handle hole on the dustbin in Figure 1.1 if the effect of the 200mm diameter curvature is not taken into account, and the material used has a shear strength of 400Mpa. (4) A. 126KN B. 251KN C. 98KN D. 318KN E. 223KN 1.5) Bereken die ponskrag wat benodig word om een handvatsel gat van die asblik in Figuur 1.1 gelykmatig uit te pons indien die effek van die 200mm diameter ronding nie in ag geneem word nie, en die materiaal n skuifsterkte het van 400Mpa. (4) A. 126KN B. 251KN C. 98KN D. 318KN E. 223KN 1.6) A true centrifugal casting operation is to be performed in a horizontal configuration to make cast iron pipe sections. The sections will have a length of 3m, outside diameter of 1m and a thickness of 20 mm. Determine the G-factor for a rotational speed of 300 RPM. (3) A. 40 B. 80 C. 70 D. 60 E ) n Ware sentrifugale giet moet in die horisontale konfigurasie geskiet om giet yster pype te vervaardig met die volgende dimensies lengte 3m, buite diameter 1m en wand dikte 20mm. Bepaal die G-faktor vir n rotasiespoed van 300 OPM. (3) A. 40 B. 80 C. 70 D. 60 E ) Which one of the following is a disadvantage of die-casting? (2) A. Shape restriction B. High production rate C. Quick cooling time D. Thin components can be cast E. Surface finish 1.7) Watter een van die volgende is n nadeel van die matrys giet proses? (2) A. Vorm beperking B. Hoë produksietempo C. Vinnige afkoeling D. Dun dele kan gegiet word E. Oppervlakte afwerking 3

4 1.8) A sheet metal plate 50 mm wide is to be bent as shown. Determine the starting length of the sheet metal plate before bending (3) 1.8) n Plaat 50 mm breed moet gebuig word soos aangetoon. Bereken die aanvanklike lengte van die plaat voordat dit gebuig word. (3) A mm B mm C mm D mm E mm A mm B mm C mm D mm E mm Figure2/Figuur2 4

5 1.9) A round bar is to be machined to yield the part in Figure 2. The part s diameter is reduced in a lathe after which a flat portion is cut on a milling machine. Given a cutting speed of 80m/min, calculate the feed required to perform the cut from a diameter of 40mm to 30mm in a time of 1 minute with a single pass. (4) A. 0.1mm/rev B mm/rev C mm/rev D mm/rev E mm/rev 1.9) n Ronde staaf moet gemasjineer word soos in Figuur 2 getoon. Eerstens word die staaf se diameter verklein op n draaibank en dan word die plat stukkie afgefrees op n freesmasjien. Vir n snyspoed van 80m/min, bereken die benodigde voer om die staaf se diameter van 40mm na 30mm te verklein in n enkel lopie in een minuut. (4) A. 0.1mm/rev B mm/rev C mm/rev D mm/rev E mm/rev 1.10) A face milling operation is used to machine the top off of the cylinder with the cutter as is given in Figure 2. Calculate the time it will take for the cut to be completed given the following: (4) Chip load = 0.1mm/tooth Rotational speed of cutter = 500 RPM A. 3.8 s B s C. 5.3 s D s E. 9.2 s 1.10) n Vlak frees bewerking word gebruik om die bokant van n silinder af te frees met n snybeitel soos aangedui in Figuur 2. Bereken die tyd benodig om die operasie uit te voer met die volgende gegee: (4) Spaander las = 0.1mm/tand Rotasiespoed = 500 OPM A. 3.8 s B s C. 5.3 s D s E. 9.2 s 5

6 SPACE FOR CALCULATIONS. THIS WILL NOT BE GRADED. SPASIE VIR ROF WERK. DIT SAL NIE GEMERK WORD NIE. 6

7 QUESTION 2: Assembly drawing [50] TO BE COMPLETED ON THE FRONT OF YOUR A3 DRAWING SHEET The detail drawings of a number of components are shown in Figure 2.2. The components form part of a ROOF HOIST POINT. There are standard components used in the assembly which are not shown in Figure 2.2. Draw the following views to fully describe the assembly. VRAAG 2: Samestellings tekening [50] VOLTOOI OP DIE VOORKANT VAN U A3 TEKENVEL Die detail tekeninge van n aantal komponente word getoon in Figuur 2.2. Die komponente vorm deel van n DAK HYS PUNT. Daar is standaard komponente wat nie aangedui word op Figuur 2.2 nie. Teken die volgende aansigte om die samestelling te beskryf. A FULL SECTION-principle view as is seen from direction A in the schematic diagram Figure 2.1. An EXTERNAL right view as seen from direction B. A PARTIAL TOP view to show only the mounting holes n VOLSNIT-Vooraansig soos gesien uit rigting A op die skematiese diagram Figuur 2.1. n BUITE Regter-aansig soos gesien vanuit rigting B. n GEDEELDLIKE BO-aansig om slegs die monteeringsgate te toon Complete the item list for the assembly and add the relevant dimensions. Use third angle projection for this question. Use the following title: ROOF HOIST POINT Use the following drawing number: GX-EXAM X indicates your specific group number. G1 Tuesday 07:30 G2 Tuesday 10:30 G3 Wednesday 14:30 G4 Thursday 08:30 Voltooi die item lys vir die sametelling en voeg die nodige dimensies by. Maak gebruik van derde hoekse projeksie. Gebruik die volgende titel: DAK HYS PUNT Gebruik die tekening nommer: GX-EKSAMEN X dui u spesifieke groepnommer aan. G1 Dinsdag 07:30 G2 Dinsdag 10:30 G3 Woensdag 14:30 G4 Donderdag 08:30 Figure 2.1/Figuur 2.1 7

8 8

9 Question 3: Isometric drawing [20] TO BE COMPLETED ON THE BACK OF YOUR A3 DRAWING SHEET 3 Views of a component is shown in Figure 3. Draw an isometric sketch of the component. Vraag 3: Isometriese tekening [20] VOLTOOI OP DIE AGTERKANT VAN U A3 TEKENVEL 3 Aansigte van n component word aangetoon in Figuur 3. Teken n isometriese skets van die component. Figure 3/ Figuur 3 9

10 FORMULA SHEET / FORMULE BLAD CENTRIFUGAL CASTING / SENTRIFUGALE GIET OTHER F = volume of cone = h GF = N = CUTTING / SNY c = at F = StL BENDING / BUIG BA = 2π (R + K t) if R < 2t, K = 0.33 if R 2t, K = 0.5 TURNING / DRAAIWERK N = f = Nf T = MRR = vfd DRILLING / BOORWERK N = f = Nf T = MRR = MILLING / FREES N = f = Nn f MRR = wdf T = 10

Graphical Communication MGC 110 Grafiese Kommunikasie MGC 110

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