Definition, nomenclature and practice of –
1 Angle: Measurement and its types, method of bisecting.
2 Triangle: different types
3 Rectangle, Square, Rhombus, Parallelogram.
4 Circle and its elements
5 Different polygon and their values of included angles. Inscribed and circumscribed
polygons
Free hand sketching: Apart from making drawing using
instruments, often craftsman will be required to make
drawings by free hand.
Free hand sketching is an easiest method to express the
shape of a piece part or a component by an engineer or
craftsman.
Here are a few examples of situation wherein free hand
sketches will have to be necessarily made.
• On the site sketching for production/maintenance.
• Recording of initial idea of a design.
• For quick exchange of ideas among designer,
draughtsman, technician.
• Urgency (free hand sketching takes less time)
To make free hand drawings/sketches, the craftsman has
to acquire new skills and one has to have considerable
practice to be able to make good free hand sketches.
Ability to make good free hand sketches is an asset to any
craftsman.
Free hand sketches are not usually made to scale.
However, they should be as nearly to the proportions as
possible.
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