2.1 Isometric projection

• describe isometric projection as used in drawing
• draw basic shapes in isometric projection
• construct circles and arcs in isometric projection
• convert given orthographic views into isometric projection
• appreciate the application of isometric projection in real life

“Why is isometric projection important in real life?”

“How are skills on isometric projection applied in power mechanics?”

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1. Three axes at 30 degrees
   40 min · 1 practice tasks · quiz
   Set out the isometric axes, one vertical and two at 30 degrees to the horizontal, and read the angles at the near corner.
2. The isometric scale
   40 min · 1 practice tasks · quiz
   Construct isometric lengths with a 45 degree line and a 30 degree line, using the factor 0.816.
3. A cube two ways
   40 min · 1 practice tasks · quiz
   Draw a 50 mm cube with true lengths, then the same cube as a projection with edges of 40.8 mm.
4. A cuboid on the three axes
   40 min · 1 practice tasks · quiz
   Draw an 80 by 50 by 40 block in isometric drawing, length to the right, depth to the left, height vertical.
5. Lines that are not on the axes
   40 min · 1 practice tasks · quiz
   Plot the ends of a sloping edge with isometric coordinates, and do not scale the slope itself.
6. A circle on a face
   40 min · 1 practice tasks · quiz
   Plot a 40 mm circle on an isometric face with the offset points 12 mm and 16 mm, inside a rhombus that the curve does not corner.
7. A compass approximation
   40 min · 1 practice tasks · quiz
   Build the four-centre compass oval in the rhombus, and treat it as an approximation of the plotted circle.
8. A rounded corner
   40 min · 1 practice tasks · quiz
   Draw one quarter-circle of radius 15 mm on an isometric plate, using the points 9 mm and 12 mm from its centre.
9. From orthographic sizes
   40 min · 1 practice tasks · quiz
   Crate an 80 by 50 by 40 block, then remove a full-depth step 30 mm long and 15 mm deep from the top.
10. A wheel chock
    40 min · 1 practice tasks · quiz
    Draw a 100 by 60 by 40 chock that slopes to the ground, and say what the picture is for.