Work Instruction
Meghnad Saha Institute of Technology
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JOB/EXPERIMENT NO.:
ES-ME192/01/Carpentry
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NAME OF EXPERIMENT:
Making a single piece wooden pattern
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OBJECTIVE:
To make a wooden pattern of specified dimension for mold
making in foundries.
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INTRODUCTION TO CARPENTRY SHOP:
Carpentry is the process of
shaping Timber, using hand tools. The products produced are used in building
construction, such as doors and windows, furniture manufacturing, patterns
for molding in foundries, etc. Carpentry work mainly involves the joining
together of wooden pieces and finishing the surfaces after shaping them. Hence,
the term joining is also used commonly for carpentry. A student studying the
fundamentals of woodworking has to know about timber and other carpentry
materials, woodworking tools, carpentry operations and the method of making
common types of joints.
Materials Used in Carpentry:
Basic materials used in carpentry shops are timber and plywood. Auxiliary
materials used are nails, screws, adhesives, paints, varnishes, etc.
Timber:
Timber is the name given to wood obtained from exogenous (outward growing)
trees. In these trees, the growth is outward from the centre, by adding almost
concentric layers of fresh wood every year known as annual rings. After the full
growth, these trees are cut and sawed to convert into rectangular sections of
various sizes for engineering purposes.
Timber is available in the market in various shapes and sizes. The common
shapes and sizes an: given below:
1. Log: This is the trunk of a die tree which is a tree from branches.
2. Balk: This is the log after sawing roughly to square cross section.
3. Deal: This is the log after sawing into a rectangular cross section of width
about 225 mm and thickness up to 100 mm.
4. Plank: This is the timber piece having width more than 275 mm and
thickness 50 to 150 mm.
Department of Mechanical Engineering Page 1
