CONSTRUCTION OF A FAMILY SIZE CABINET BED [PDF]

CHAPTER ONE

 INTRODUCTION

It has taken several countries for wood work craft men to reach out to the present stage of development regarding modern techniques of using wood, wood product, wood tools and machines. The best constructional method gained by experience and invention had been handed down to the craft man of one generation to the next.

In the middle age the carpenter carried out all types of construction works, he was in reality of “Jack of all trades” being the Architects and builder of houses, as well as the designer and maker of furniture and furnishings in the house.

The cabinet maker normally works at a bench and is normally concerned with the construction of movable items of furniture e.g bed, table etc. he used accurate fitting joints to produce high quality furniture made specially selected fiqured wood and wood product and transparent finished.

They need knowledge of design principle working properties of the materials constructional method. The high demand for bed and other furniture necessitates, it mean production by skilled craft man.

1.1 TIMBERS

Timber are tree been falled and cut into logs converted and seasoned for building and constructional purpose.

Before a tree is converted into timber, it has the following parts:

Back: this is the corking outer layer of a tree, which protects it against external damage.

Bast: this is also known as linear back, it carrries the enriched sap down from the leave to all the growing parts of the tree. The outlayer of the best progressively dies off and form new layer of bark. The old back scalbs off as the tree increase in sizes.

Cambium: this is a thin layer of living cells under the best the cells divide to form new wood cells during the growing.

Heart wood: this is the liner more matured part of the tree which no longer covers the sap. Its min function is to give strength to the tree in many timbers it is often daker and harder than sapwood.

Pith: this is also known as medulla, it is the first growth of the tree and often decays as the tree gets order.

Medullary rays: these are group of good storing cells, which radiates from the pitch medulla of  tree.

Sap wood: this is the newly formed outer layer of growth which convey the rising unenriched sap up to the leaves. As the sap contains insects and fungi attacks, unless it has been treated with a representative.

Annual rings: these are known as growth rings in cold countries, including Britain the growth take mainly in the spring and summer months ands an annual growth ring is formed. In tropical countries, the growth can be almost continous and sometimes, it is virtually impossible to distinguish between each year growth rings.

1.2 STRCUTURES OF TIMBER

Indeed all commercial timber are divided into two parts, these are:

1. Soft wood: coniferous trees.
2. Hard wood: deciduous tree

This grouping has nothing to do with the hardness of timber concerned, but is based solely on it

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