In this work we had to build a tangram is a game of Chinese origin who has 7 pieces (see
drawing). Serves to form hundreds of different figures alone with his 7 pieces.
We used about three days to do so. We had to use the following mate
The set of organic tissues that form the bulk of the trunks of trees, stripped of bark and leaves.
Pith: central part of the trunk. Consisting of loose and porous fabric. It is the starting medullary
rays towards the periphery.
DRYING OF WOOD
It has been proven that the wood dries improve their technological properties, which is why
virtually all woods receive a fitness before use. Water removal due to various purposes, some of
which are essential to ensure the goo
IMPORTANCE OF MOISTURE CONTENT OF WOOD
Hygroscopic within the range (0 to 30% CH), influences significantly the following properties:
Flexural strength: The wood resists efforts in axial direction.
For testing of samples are available in the form of prism. Consider the radial and tangential
directions as resistant to bending, however if the piece is cut so that the length is the axial
Wood is a hard, fibrous material beneath the crust is forming the body of the trees. This consists
of millions of microscopic and longitudinal cells into tubes.
COMPOSITION OF WOOD
In average composition comprises 50% carbon (C), 42% of oxygen (O),
Oil is a liquid mixture of compounds orgnicos.Su composition varies greatly according to the
site, although it is always a very complex mixture in which the main constituents are
Petroleum refining - essential for obtaining process u
Transport: The 2nd phase and wherein the timber is transported from place to cut the mill and at
this stage depend much as the topography and insfrastuctura there.
Usually done by pulling animals or machines but there are cases where there is a river near
It is the set of operations to split a log, squared or not, by any means. Can be longitudinally.
Influences the trunk section and type of wood.
Boreal: This is the simplest. We frame taking advantage of everything the trunk. A piece calle
As a consulting firm was commissioned us to verify a shelf that will be used to place on it a
sculpture, all framed in the celebration of the bicentennial of independence of our country Chile.
To verify that the shelf bear the burden of 1.5 Kg ,
6 CLASSIFICATION OF WOOD
The quality of solid wood is evaluated in terms of defects presented.
The woods are classified according to their actual resistance (theoretical resistance reduced by
For structural applications strength classes (EN 338)
Hard or very hard, heavy (0.70g / cm3), except alder, basswood, poplar (0.55 g / cm3, soft)
Elastic, easy to work. Pets are good surface treatment.
No weatherproof (except oak is very resistant).
Not resistant to
DEFECTS OF WOOD
Reduce the mechanical performance of the material.
They may have different origins:
Natural: due to tree growth.
Cracking and crazing (feudas)
Form (eccentric heart cavities)
Structure (wavy fibers, twisty, entrelazadazas).
COMPOSITION AND STRUCTURE OF WOOD
MICROSCOPIC STRUCTURE OF WOOD
MECHANICAL BEHAVIOR OF THE CONSTITUENTS OF THE CELL WALL
3. PHYSICAL PROPERTIES
WOOD MOISTURE. WATER RELATIONS - WOOD
MICROSCOPIC STRUCTURE OF WOOD
As seen the timber is not a homogeneous material is formed by various types of specialized
cells that form tissues.
These fabrics are used to perform the essential functions of the tree; lead sap, process and
store food and f
TOOLS USED AS CONTAINERS
Dropper bottle. Allows contain added substances required in small quantities.
Pizeta. It is a plastic bottle with long beak, which is used to contain distilled water, this tool
makes cleaning electrodes.
They are tools
IDEA AND DESCRIPTION
The idea is to make a wooden wheel to rotate on its axis, with eight passenger cabins made of
cardboard and attached to the wheel by a chain.
The wheel will be made entirely of wood except the shaft will be done in addition to metal.
The laboratory equipment are used for the experimental verification of the laws and phenomena
of the natural sciences, studied in theory. To work efficiently in the laboratory is necessary to
know the names of the different materials and
PARTICLE BOARD O AGLOMERADOS
Incorporating wood particles (thin stems, branches, residual pine, fir, poplar, alder, beech, birch)
and synthetic resin glues.
Formed by hot pressing (a homogeneous layer or 3-layer) or extrusion (lightweight boards).
1. Indicates that parts of the tree are used to produce commercial products.
The trunk of the tree, in general, is the only part of the commercial products used as industrial
materials are obtained. An exception can be used roots and thick for obt
BUSINESS TYPES AND SIZES.
Plates measured 1820 x 3600 and 1520 x 4840 mm. Are produced in three types which are
referred by number, which relates to its density.
Type 620: It is constituted only with fine chips 0.2mm thickness, density is 620 kg / m3 and
INSECTS IN THE WOODS:
Wood boring insects (beetles and termites)
They feed on cellulose from wood.
Lumber Grading against attack:
Very attackable: alder, cherry.
Attackable: oak and walnut.
Shortly attackable: maple, chestnut and elm.
Parasites: prey on l
Detail A Set vertical slats.
Bonded joints between boards will plug with two slats on both sides squaring minimum of 14 x
45 mm. The woods are glued to the board by fastening with nails every 15 cm apart. If you want
better stiffen the wall, we recommend
CHANGES OF PROPERTY BY CH
The physical and mechanical properties of wood vary with CH.
Volume increase: from dry to PSF
Contraction: Decreased CH below PSF (drying).
The dimensional variation depends on the direction of
Manual Transportation: Transportation in this case is individual and should be executed for 2
Where possible must be stored horizontally, in the case that the space is reduced using
recommended stacked obliquely at an angle not exceeding
Impregnation of wood.
The only treatment that is recognized and standardized is the impregnation of radiata pine wood
preservative CCA, using vacuum and pressure. This treatment ensures that the protection is in
the dough and not only on the surface.
WOODS AND VEGETABLE MATERIALS.
Composition and structure of wood
Durability and destructive agents of wood
Protection of the woods.
It is the set of tissues that form the trunk, roots and branches of trees,
Is a product that your Prosesa Consata the accumulation of particles impregnated wood
adhesive resin which will be pressed.
Also within the category of agglomerated wood are the hardboard, which unlike agglomerated,
material used are wo
The septum must be protected from the action of moisture through a vapor barrier, which may
be embodied with polyethylene or other similar material. Always the vapor barrier should be
installed by the hot side of the partition, ie, on the i
Overlay and rolled
Unions for singing.
Flat Top. (Parquet)
Nailed or bolted joints.
The strength of a riveted or bolted connection is due to friction between the parts. As wood
shrinkage deforms adhesion.