Technical sketching

Technical sketching is the process of producing a rough preliminary drawing representing the main features of a product or structure. A technical sketch is generally less finished, less structured or restricted, and it takes less time than other types of freehand illustrations. Also, a technical sketch may communicate only selected details of an object, using lines; whole parts of an object may be ignored, or shown with less emphasis, while other features may be shown in great detail.

Technical sketches can take many different forms, depending on the clarity needed and the purpose of the sketch, both of which depend on the audience for which the sketch is intended. For example, a sketch mde quickly to record a fleeting design idea may be very rough. This type of skeetch is for personal use and is not meant to be understood by anyone but the individual who produced it.

Simple Technical Sketch 


Classification of sketches

Keep in mind the classification of sketch that you are asked to produce within your projects, otherwise you could end up creating a sketch that does not show the level of detail to fulfill what asked.

The most common types of projection used in sketching are multi-view, isometric, oblique, and perspective. The classification of sketches can be broken down into two main types: pictorial and multi-view.

Pictorial sketches are made up of either isometric, oblique or perspective sketches, present an object in a single pictorial view, with all three dimensions represented.

Multi-view sketches on the other hand, present the object in a series of projections, each showing only two of the object's three dimensions.

However, it should be remembered that there are always trade-offs when using any type of projection; some are more realistic, some are easier to draw, and some are easier to interpret by non-technical people.

Multiview sketches

Multi-view sketches are more formal drawings, used by the engineer to communicate technical information about the design to others. However, this type of sketch would not be appropriate for a non-technical person.

Pictorial sketches

Pictorial sketches would be used to further clarify the design idea and to communicate that idea to non-technical individuals. All of this information is presented in a that is easy to visualise; usually a 3D image represented in 2 dimensions.

Shaded sketches

Shading can also be used to help enhance the sketch and make to more realistic, making it much easier to visualise the object. This type of sketch though is more suited towards pictorial sketches and even then it is more appropriate for technical illustrations than for design communication.

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