Index: Stone, Bronze, Iron Age. Nowadays technical use materials. Natural vs. artificial materials. Wood. Actual relevance. Parts. Processing. Features. Working with woods (measure, draw, fix, cut, smoothen, drill, join, finish). Derivative products (cardboard, paper). Wood samples. Types of wood. Enviromental Impact.
Stone, bronze, iron Ages. Nowadaystechnical use materials. (I) Stone Age
Stone, bronze, iron Ages. Nowadaystechnical use materials. (II) Bronze = Cu – Sn alloy Cu = copper Sn = tin Bronze Age
Stone, bronze, iron Ages. Nowadaystechnical use materials. (III) Iron = Fe Iron Age
Stone, bronze, iron Ages. Nowadaystechnical use materials. (IV) Woods 2º E.S.O. Metals (ferric, non ferric) Plastics 3º E.S.O. Ceramics
Natural vs. artificial materials. Features: Conductivity (heat and electricity) Hardness
Wood. Actual relevance. Parts. Processing. Features. (I) Wood is a natural material. Wood and stone were the first materials that man used. Wood has been used to light a fire, to make wood weapons, to build boats, houses, etc. Some of these things arestill used today.Woods. Actual relevance.Parts: Bark (inn. and out.) Cambium Sapwood Heartwood Medullary rays Pith (medulla)
Wood. Actual relevance. Parts. Processing. Features. (II)od: part of the trunk with life. It´s the youngest part of the wood. Its colour is light. It Heartwood: the best quality part. has a lot of sap.dullary Rays: they are cracks from the center outwards.k: the outer trunk´s part. It is a protector of the trunk.. Medulla: the inner trunks part.
Wood. Actual relevance. Parts.Processing. Features. (III)Features: density d = m / V hardness H resistance to traction, compression and bending T, C, F (fiber direction) conductivity (th.&el.) durability (moisture, hygroscopicity, fungus, rot)
Wood. Actual relevance. Parts. Processing. Features. (III) Processing: http://www.youtube.com/watch?v=cwwkO7m4bpY&NR=1 Planks, boards, beams, etcAfter cutting the wood, It´s necesary to dry in order to evaporate the sapand the water. The wood is stacked to allow air to flow. It is faster with hot air
Working with wood measure and draw Rip saw, backsaw and hacksaw. Wood Power Tools: circular saw, jigsaw and table saw. sawhttp://www.youtube.com/watch?v=EAgCi1J7Hl0&feature=player_embedded The trees are cut in the winter, because they have less sap. •The tools to cut trees were the axe and the hand saw. •The tools used today are the chainsaw Wood and big machines that cut and raise the trunk quickly. smoothen (sand) drill join and fix (glue, nail, screw)http://www.youtube.com/watch?v=rM5g0Sk0AWo&feature=player_embedded finish (wax, varnish, paint, ink, lack)
Types of wood. Samples. http://www.linalquibla.com/TecnoWeb/madera/contenidos/tiposmadera.htmPoplar = chopoWalnut = nogalOak = robleBirch = abedulCherry = cerezoPine = pinoEbony = ébanoFir = abetoSoft wood: resinous and evergreen trees, theyare easy to work with (pine, fir, poplar…)Hard wood: deciduous trees like oak , walnut, ebony,…
Derivative products (II) (plywood, chipboard, fiber board).Artificial Boards: • Cheaper and bigger sizes than natural wood. • Completely flat and smooth. • Will not rotand it´s termite resistant.Plywoods: Made with wood sheets with perpendicular fibers and are stuck together. These boards alwayshave an uneven number of sheets.Chipboards: Made with glued and pressed wood shavings.We can paste plastic or natural wood sheets together toget a wood best finish quality.Fiber Boards: We can get them fromwood fibers pressed together athigh pressure and temperature,glued with synthetic resin(DM) or natural resin(tablex).