|Carpentry for Vocational Schools - A Teachers Handbook|
TOPIC: 1. TIMBER
INTRODUCTION: Before we begin talking about building houses, we think that students should know about where the timber comes from; the environment in which the tree has grown and the functions of a tree while it is still alive.
This topic teaches students how a tree grows, the parts of a tree, how a tree is converted into timber, the seasoning and shrinkage of timber, timber defects, common timber sizes and the names of timber used in the construction of a house.
1.1. Students should be able to state the names of the parts of a tree and their functions.
1.2. Students should know how a tree can be converted into timber.
1.3. Students must be able to define "seasoning of timber" and know why it is necessary.
1.4. Students should know what happens to timber during the process of drying.
1.5. Students must be able to identify the different defects and their causes.
1.6. Students must know the commercial names and sizes of the timber used for buildings .
1.7. Students should be able to name some common timber from their area and its characteristics.
1.8. Students must be able to name all the technical names of the timber used in a house construction.
METHODS: In teaching it is widely known that lessons are more effective when they also contain practicals as well as objects shown to students, in order to give them a better understanding of the subject.
1.1. After writing down the parts of a tree, prepare a cross section of a log and show the different parts and their colours.
1.2. We explain the different ways a log can be converted to timber. When possible organize an excursion to a sawmill and let the manager explain the process.
1.3., 1.4. After introducing this topic on the blackboard, prepare a piece of completely wet timber and let students take measurements. Let them measure it again after a few weeks and check if it has changed in size and shape.
1.5. Prepare some timber with defects as shown in this book and display it in the classroom. Explain to students how some defects can be prevented.
1.6. Prepare some pieces of timber in the sizes shown in the book and display them in the classroom.
1.7. Prepare some samples of common timber used in furniture and building work and describe their characteristics as well as their applications.
1.8. When possible, take the students to a building and show them all the parts of a house and name them.
NOTE: It is advised to go through each single topic first in the classroom and discuss it with the students. Students also should use their Trade Theory book to draw and write down all important things. To make work easier and faster, you can photocopy the drawings from the teachers book, cut them out and glue them in the students book.
Afterwards prepare a worksheet with questions which students can fill in during their private or nightstudies and be assessed later.