Lesson 2: General Oblique Drawings



The general oblique drawing is typically the hardest of the three oblique drawings to draw because of the 3/4 scale at which the depth dimension is projected. If a student is completing this assignment using a manual drawing board and equipment, the 3/4"=1" scale can be found on their engineers scale. A lesson on reading the 3/4" scale will need to be taught prior to this assignment. The students will need to know how to read the 3/4" scale and use it efficiently or this assignment won't be possible for them to complete.

If the students are using a CAD system to draw this assignment they will not need to know how to use the 3/4" scale. It would be beneficial for them to know and I would recommend that they receive the same instructions, however, it isn't essential to completing this assignment. They will, however, need to use some math to figure out the equivalent 3/4 scale measurements.

Lesson Time

Hook and Set
10 Minutes
Drawing setup
30 Minutes
Drawing lab work
50 Minutes

Industries / Subjects / Grades

Grade Levels
  • 11

Standards and Objectives


California Math Common Core Standards (1)
California's 2008 CTE Standards (1)

Related Instructional Objectives (SWBAT...)

  • Students will learn to set up a general oblique drawing.
  • Students will learn to use a 3/4" = 1" scale.
  • Students will draw a general oblique drawing using manual drafting equipment or a CAD system.

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