Chapter 8: Problem 2

Keep a sketching journal to practice your sketching technique. This idea is similar to writers who keep written journals to document their ideas in words. It is a good habit for an engineer to document ideas using sketches in order to maintain a record of when and how the idea was developed-this is especially critical in the patent application process. Suggestions for your journal include the following: use a variety of projection techniques (orthographic, oblique, isometric); use either a bound notebook or loose sheets of rectangular grid paper contained in a binder; sketch familiar objects that are in your room, apartment, or house for practice.

Short Answer

Expert verified

Answer: The different projection techniques that can be practiced in a sketching journal are orthographic, oblique, and isometric.

Step by step solution

Choose and Set Up the Sketching Journal

To begin the sketching practice, first select the type of sketching journal to use. It can be a bound notebook or loose sheets of rectangular grid paper contained in a binder. Grid paper will help in maintaining uniform spacing and better alignment while sketching.

Identify Familiar Objects to Sketch

Start by choosing some familiar objects from your surroundings like room, apartment, or house. These objects can be everyday items like furniture, appliances, gadgets, or any other objects that have interesting shapes and details.

Understand Projection Techniques

Before starting to sketch, familiarize yourself with different projection techniques such as orthographic, oblique, and isometric. In orthographic projection, the object is shown in its true dimensions in three views - front, top, and side. Oblique projection is a combination of orthographic projection and perspective projection where one face is parallel to the plane while others recede at a particular angle. Isometric projection is a type of axonometric projection where all three principal axes are equally foreshortened and equally inclined to the plane of projection.

Start Sketching Using Orthographic Projection

Begin by sketching one of the familiar objects you identified using orthographic projection. Sketch the front, top, and side views of the object in their true dimensions. Make sure that the object is aligned using the grid lines on the grid paper for accuracy.

Sketch Using Oblique Projection

Once you have practiced orthographic projection, move on to sketch the same object using oblique projection. Choose an angle for the receding edges (commonly used angles are 30, 45, or 60 degrees) and sketch the object accordingly.

Practice Isometric Projection

Finally, practice sketching the object using isometric projection. Keep in mind that all principal axes are equally inclined to the plane of projection (typically, they make 120 degrees with each other) and are equally foreshortened. Use grid paper with isometric lines or create an isometric grid on your regular grid paper to help in sketching.

Sketch a Variety of Objects

Continue practicing by sketching a variety of familiar objects using all three projection techniques (orthographic, oblique, and isometric). This will allow you to practice and improve your sketching technique and become comfortable with different projection methods. By regularly practicing sketching techniques and maintaining a sketching journal, an engineer can effectively document their ideas and potentially use their sketches as a basis for patent applications and other engineering documentation.

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Short Answer

Step by step solution

Choose and Set Up the Sketching Journal

Identify Familiar Objects to Sketch

Understand Projection Techniques

Start Sketching Using Orthographic Projection

Sketch Using Oblique Projection

Practice Isometric Projection

Sketch a Variety of Objects

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