Stock Forms, Types And Sizes
Gbogbo ọrọ náà
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.
Ebumnobi
- 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.
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
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Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Stock Forms, Types And Sizes. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- 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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Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Stock Forms, Types And Sizes? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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