The layout of drawing should facilitate the reading of drawing and make it's possible for essential references to be located easily.The title block at the bottom right hand corner is an important features in a drawing and it contains information such as the title of the drawing , drawing/sheet number , scale,symbol denoting method of projection,name of the organization , and name and initials of technical staff who prepared the drawing .the size of the title block recommend is 185*65mm for all sheet sizes.the typical layout of the drawing sheet A4 & A0 is shown in fig

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Center Lines are used to represent symmetry , and to mark the centres of the circles and the axes of symmetrical parts, such as cylinders and bolts.

Break Lines are freehand lines used to show where an object is broken to reveal interior features.

Dimension and Extension lines are used to indicates the sizes of features on a drawing.

Section Lines are used in section views to represent surfaces of an object cut by a cutting plane.

Visible lines are used to represent features that can be seen in the current view.

Hidden Lines are used to represent features that cannot be seen in the current view.


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Standards are sets of rules that govern how technical drawing are represented.Standard allows for the clear communication of ideas. In the United States, the American National Standards Institutes (ANSI) is the governing body that's sets standard organization has adopted ISO standard for engineering and technical Drawings.

Conventions are commonly accepted , practices , rules or methods used in technical drawing .



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A drawing is a Graphical representation of the object and structures and is done using freehand , mechanical or computer methods. Drawing , or more concrete, such as sophisticated 3 dimensional computer models.

Engineering Drawing are created using a variety of instruction ranging from traditional tools , such as pencils, compass , mini drafter and stencils, to the computer.Drawing tools are used to make accurate and legible drawings and models.Today computer are used for most drawing and modeling requirements

Traditional Drawing instruments are still important , especially for sketching.

Engineering graphics is a real and complete language used in the design process for:

1. Communication
2. Solving problems
3. Quickly and accurately visualizing objects.
4. Conducting analyses
5. Documentation