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Lecture 5 Tuesday 18 April 2023 2
Isometric Terminology
• The three coordinate axes are called isometric axes
• Any line parallel to isometric axes is called isometric line
• A non-isometric line is a line not parallel to any one of the three isometric axis
• In isometric projection of cube, the faces of the cube and any plane parallel to them is called isometric planes
Lecture 5 Tuesday 18 April 2023 3
Notes
• Objects composed entirely of isometric lines can be drawn by taking all measurements parallel to main edges of the enclosing box.
• In an isometric drawing, an angle never appears in its true size.
• Non-isometric lines are drawn by transferring the ordinates (which are on isometric lines) of the end of the lines
Lecture 5 Tuesday 18 April 2023 4
Objects with Normal Surfaces
Make an Isometric Drawing with corner A at the bottom
Lecture 5 Tuesday 18 April 2023 6
Objects with Oblique Surfaces
• Make an Isometric Drawing with corner A at the bottom
NON-ISOMETRIC LINE
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Objects with Non-isometric Lines
• Make an Isometric Drawing with apex A facing front
Lecture 5 Tuesday 18 April 2023 9
Objects with Non-isometric Lines
• Non-isometric lines are drawn with box construction and offset measurements
• Non-isometric lines are not drawn in true length in isometric drawing (BA is shorter than CA in this drawing)
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Irregular Objects
• Make an Isometric Drawing of the following irregular object (pyramid)
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Irregular Objects
• OA and OB offsets help to locate apex O
• Complete box construction may not be needed in each case
Lecture 5 Tuesday 18 April 2023 12
Notes
• Axonometric projection shows all 3 dimensions, length, width and height
• The isometric lines are only drawn to scale.
• Inclined and oblique surfaces are drawn using end coordinates
• Angles, irregular curves require special techniques
• Box construction and offset measurements are common methods