0445 DESIGN AND TECHNOLOGY

Transcription

1 CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME f the May/June series 0445 DESIGN AND TECHNOLOGY 0445/33 Paper 3 (Resistant Materials), maximum raw mark 50 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners meeting befe marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Rept f Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes f the May/June series f most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components.

2 Page 2 Mark Schemee IGCSE May/June Syllabus Paperr Material, length, type of head, gauge, diameter, quantity, type off slot [Phillipss o posidrive]. Accept thickness, diameter. (3 1) [3] 2 Tool Name Use Tinsnips/ /snips Cutting sheet metal Mallet To strike a chisel, witw th scras ap woodd (4 1) [4] 3 Scriber, oddd legs. Centre / dot punch. 4 B A has sht grain, grain is shter and therefe will snap me easily. 5 Bookcase is carcase construction. Table is stool fraf me construction. 6 To mark out a line to be sawn chic selled. 7 Hardwood chair requires many separate pieces that have to t be constructed and assembled Increasing labour costs, whereas the plasticc chair can bee mom uldedd as oneo piece. F maximum 2 marks answerss musm st contain referencess too both chairs. 8 Chuck. Knurling tool. 9 3 wayss includes: smooth and rounded shape, comftable handle, efficient spoutt too pour, easy to open lid, stable base, see-through sides to chec eck water level. (3 1) [3] Cambridge International Examinations

3 Page 3 Mark Schemee IGCSE May/June Syllabus Paperr Hardwearing, insulatess from heat, easy to clean. Will not crode, attractive metal. 2 methods include: epoxy resin and rivet. Section B 111 Easily moulded/shaped, attractive colours, easily joined, impact resistant, self-finished. (c) Retain plastic/ /paper covering, make sure surfaces aree covered when holdingg inn vice on bench. [5] Marker pen canc be erased but a scriber will provide a permanent scratchh inn the surface. F maximumm 2 marks reference to both required. (d) Coping saw, machine saws including vibro, Hegner equivalent, band saw. Two precautions: suppt underneathh when drilling, clamp down securely, drill speed, cutting anglee on drill. (e) Two advantages include: seee if it wks, chec eck sizes, appa pearance, cheaper if mistm takes are made. (f) Mainn stages include: scrape file wet anda dry paper polishing mop and compoundd Cambridge International Examinations

4 Page 4 Mark Scheme Syllabus Paper IGCSE May/June additional detail relating to any of the fmer stages [4] (g) Main stages include: heat plastic using oven, strip heater, line bender use of mould/fmer retention of plastic while cooling technical accuracy / quality of communication (0 2) [5] 12 Hardwearing, close-grained, attractive, tough, durable. Lightweight, easily bent to shape, crosion resistant, self-finished. (c) Polyurethane / varnish, white / French polish, variety of oils and preservatives, wax, lacquer. (d) (i) Tenon saw, cross-cut saw, band saw, Hegner equivalent saw, jig saw, coping saw. (ii) Sketch must show: Use of G cramp Use of scrap wood Added notes Bench hook Held in vice Added notes [3] Award max. 1 mark if shown in vice. (e) (i) Sanding disc shown. Table platfm with wood positioned. Added notes to show crect part of disc and operation. [3] (ii) Jack plane shown. Vice shown. Method: plane across to middle and stop/repeat from other end use of scrap wood allows to plane across end use of shooting board. (0 2) method [3] (f) Method of securing one end of rod. Method of fming 30 mm radius: use of fmer. (0 2) Method of fce: hammer. [4] Use of vice award max. 2 marks. Cambridge International Examinations

5 Page 5 Mark Scheme Syllabus Paper IGCSE May/June (g) Some fm of bracket, tube, cup f rod. Appropriate method of fixing bracket to back. Suppt f rod to prevent dropping and jamming. Allowed to rotate securely. Details of materials, fittings and fixings. (0 2) [6] 13 Sizes of drawing paper, equipment to be sted [sizes and quantity], target market. Piano hinge. Accuracy / quality of sketch of hinge. (0 2) [3] (c) Finger [comb] joint, dovetail, lapped joint, butt joint with panel pins and glue, mitre joint, dowel joint. Crect name: Accuracy / quality of sketch of joint. (0 3) [4] (d) Use of rebate, groove applied beads. Award max. 2 marks f glued only nails through sides. Award 0 3 dependent upon quality/accuracy of construction. [3] (e) Use of components such as hasp and staple and variety of clasps, clips and locks. Method must fix to both board and case. Accept use of straps, Velcro, magnets maximum 2 marks. Award 0 3 dependent upon quality/accuracy. [3] (f) Main stages include: Drill a hole f a saw blade to fit through. Insert blade of coping saw Hegner saw equivalent. Saw out shape. File / glasspaper shape smooth. [4] (g) Board set to 3 positions. Board suppted on both sides of case. Board is secure and will not collapse when wked against. Ease of use can be set with one hand. Name of one appropriate material. Detail of one fitting fixing construction. [6] Cambridge International Examinations