6 - Performance characteristics of Woods Flashcards

Question

Properties of Cedar (5)

Answer 1

* Straight grain * Can corrode ferrous metals due to acidic nature * Low density * Good sounds damping * Good resistance to moisture

Answer 2

* Exterior cladding * Sheds * Greenhouses * Beehives * Interior planning

Answer 3

* Good strength in all directions * No grain weakness * Odd number of layers

Answer 4

* Structural work * Desk tops * Indoor furniture * Floorboards

Answer 5

* Resistant to moisture - as it is constructed by gap- and void-free and uses specialist water and boil proof (WBP) glue * Higher quality marine plywood is also resistant to fungal attack

Answer 6

* Boat dashboards * Boat lockers and panelling

Answer 7

* Plywood Made from high-quality timber such as Birch * Available in very thin sheets * Lightweight * Easy to bend around a support frame

Answer 8

* Gliders * Laminated Furniture * Laser cut projects * Jewellery items

Answer 9

* Odd number of layers glued together with two outer layers made from open grained timber which allows the sheet to flex * Bent and clued around a former to achieve a solid shape

Answer 10

* Laminated Furniture * Curved panels

Answer 11

Wood chips compressed with a resin such as urea formaldehyde

Answer 12

* soften veneered or covered with polymer laminate * Kitchen worktops and units * Shelving and flat-pack Furniture

Answer 13

* MDF is compressed wood fibres although sometimes urea formaldehyde is added as an additional resin * Two smooth faces available in either standard grade or veneered with a layer of timber

Answer 14

* Model or mould making * Furniture items e.g bookcases, cabinets and desks

Answer 15

* Rough sawn * Plain squared edge * Planed all round * Natural wood

Answer 16

* The wood comes direct from seasoning and has rough surfaces produced during initial conversion * Rough-sawn wood will have normal sizes rather than accurate finishes and is the cheapest stock form to buy

Answer 17

* Wood has only one edge that is planted accurately; the rest are rough sawn * Planning removes about 3mm from the original nominal size

Answer 18

* Wood has sides and edges that are all planed square, straight and level, leaving a smooth finish, and is ready to use * The PAR board is about 3mm smaller all round than the original rough-sawn nominal size and is the most expensive stock form to buy

Answer 19

* Natural wood comes from trees and is available only at the maximum width of the tree * To produce a wide desktop, natural wood planks need to be joined together * Planks should be joined with the end grain going in opposite direction to minimise distortion

Answer 20

* These are man-made and produced in large sheets, typically 1220mm x 2440mm * Wide surfaces can be produced from one sheet without the neeed for joining processes

Answer 21

*•* Strong in along the grain and weaker across the grain * They are converted from the tree into useable pieces and then seasoned to remove excess moisture (80-90 per cent) * Is seasoned to help prevent defects such as twisting, warping, cracks, cupping or bowing

Answer 22

Trees should be felled in winter when they grow less, have less sap and therefore contain the least moisture

Answer 23

* Is traditional and inexpensive * Wood is stacked in a shelter outside, protected from rain * Air circulates between the planks too remove excess moisture * Its a slow,process, taking up to one year * The wood is used for outdoor products

Answer 24

* Is expensive, using controlled temperature and humidity levels * The wood is stacked on trolleys * It is initially steamy in the kiln then becomes hotter and drier * It is a quick process, taking up to a few week * Wood is used for indoor products

Answer 25

* Gives greater immunity from decay and increased resistance to rot * Increases strength and stability * Helps preservatives to penetrate * Makes Wood less corrosive to metals