Coursework – Orthographic Projection

Orthographic projection is hugely important in the Junior and Leaving Certificate DCG subject. It is the core of many topics throughtout the syllabus but it is also extremely relevant to everyday life.

Orthographic projection is essentially a means of projecting a 3 Dimensional object onto a 2 Dimensional surface while being able to envisage the three dimensional object by simply looking at the 2 Dimensional surface.  In other words, its another means of communicating perfectly accurate designs in comparison to sketching a 3 Dimensional view.

Plans for houses or working drawings which are given for the Junior Certificate metalwork practical project are prime examples of orthograpphic projection and how it displays the views of a 3 Dimensional object.

Since this is a Transition Year module, the core basics of the orthographic projection course have been selected and broken down in four simple lessons which should be covered over a 2 – 3 week period. These start by taking a detailed look at the elevation, plan and end elevation, followed by inclined surfaces and hidden detail along with circular surfaces and a series of practice questions.

Lesson 1 is aimed to build and develop the level of competence of the students when working with the reference planes as these are at the core of orthographic projection and many other topics.

Lesson 2 builds on the students level of knowledge by looking at questions with hidden detail and inclined surfaces which will aid in the development of the students visualisation skills and spatial awareness.

Lesson 3 involves working with circular surfaces and being able to determine how these circles will be displayed in the different orthographic views.

Lesson 4 is a set of practice questions which aim to tie up all the skills that the students are after encountering and ensure that they have developed a solid level of understanding for this topic.

Click on the images on the left-hand side of the page to navigate into a particular lesson.