Stock Forms, Types And Sizes
Muhtasari
A student designs a shelf 650 millimetres long because it looks right. The sheet it will be cut from is 2440 millimetres long, and 2440 divided by 650 is 3.75, so three shelves come out of that length and a quarter of the sheet is thrown away. Had the shelf been 610 millimetres, four would have come out with nothing left over. Forty millimetres of drawing, decided in a second, changed the material cost of the product by a quarter.
This lesson is about the sizes materials actually come in and the components you can actually buy. You will learn the commercially available types and sizes for papers and boards, timber based materials, metal based materials and polymers, what each is sold by, and the standard components that go with them: fasteners, seals and bindings; woodscrews, hinges and knock-down fittings; rivets, machine screws, nuts and bolts. Then you will use them, calculating how many parts come out of a sheet and how to lose less of it. This is specialist technical principles content, examined in Section B of Paper 1, and it is the topic the paper's own maths column leans on hardest.
Malengo
- Commercially available types and sizes of materials and components.
- Papers and boards:
- sheet, roll and ply
- sold by size e.g. A3, thickness, weight and colour
- standard components e.g., fasteners, seals and bindings
- cartridge paper and corrugated card.
- Timber based materials:
- planks, boards and standard mouldings
- sold by length, width, thickness and diameter
- standard components e.g., woodscrews, hinges, Knock-Down (KD) fittings.
- Metal based materials:
- sheet, rod, bar and tube
- sold by length, width, thickness, and diameter
- standard components e.g., rivets, machine screws, nuts, and bolts.
- Polymers:
- sheet, rod, powder, granules, foams, and films
- sold by length, width, gauge and diameter
- standard components e.g., screws, nuts and bolts, hinges.
Ramani ya mawazo
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Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Stock Forms, Types And Sizes. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- Which one of the following is a stock form for polymers but not for timber? A. Board B. Granules C. Plank D. Standard moulding Answer: B
- Paper and board are sold by weight in A. grams per square metre. B. kilograms per sheet. C. millimetres of thickness. D. newtons per square millimetre. Answer: A
- In an M8 machine screw, the 8 refers to the A. length in millimetres. B. spanner size in millimetres. C. thread diameter in millimetres. D. number of threads per centimetre. Answer: C
- A part 400 millimetres long is to be cut from a sheet 2440 millimetres long. How many fit along that length, ignoring the saw kerf? A. 5 B. 6 C. 7 D. 8 Answer: B
- Which standard component is used in flat pack furniture because manufactured board holds a screw poorly in its edge? A. A knock-down fitting B. A pop rivet C. A machine screw D. A staple Answer: A
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