Timber conversion

Timber

Conversion

http://www.youtube.com/watch?v=7SdJtYkAz
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Learner Outcomes

List and describe the four main methods of

Timber conversion.

State the advantages and disadvantages of each type of conversion.

Timber Conversion

◼

Conversion is the sawing of a log into board or planks

ready for use by the carpenter or joiner.

◼

How the timber is converted directly affects its

usefulness.

◼

Timber Conversion

Conversion Requirements.

◼

How you convert a tree into timber depends

on three main factors:

1.

The species,

2.

The intended use

3.

The quality of the tree.

The bigger, straighter and clearer the tree, the

more options you have.

Methods of Conversion

There are four main methods of conversion

◼

Through and Through.

◼

Tangential.

◼

Quarter.

◼

Boxed Heart.

Through and Through Sawn Timber

◼

Through and Through

sawing is the most

economical method of

converting timber

◼

Advantages

-

very little

waste

◼

Disadvantages

–

a lot of

the timber cut is prone

to a lot of shrinkage and

distortion

Tangential Sawn Timber

◼

Tangential sawn timber

method of conversion is

used to give the

strongest timber

◼

This timber is normally

used for floor joists and

beams

Quarter Sawn Timber

Advantages

◼

Quarter Sawn Timber

produces the best quality

timber

Disadvantages

◼

There is a lot of waste

timber

◼

Quarter sawn timber takes a

long time to convert

◼

This method is the most

expensive

Boxed Heart Sawn Timber

◼

Boxed heart timber

conversion is used when

the heart of the tree is

rotten or badly shaken

◼

This method is known

as floorboard sawing

◼

These boards are ideal

because they are hard

wearing and do not

distort

Learner Outcomes

◼ List and describe the four main methods of

timber conversion.

◼ State the advantages and disadvantages of each

type of conversion.