1. Graphic Communication
Isometric Views
CDT
Department

2. Isometric Drawings
Lengths and breadths are drawn at 30° to the horizontal.
Heights are drawn vertically.
All sizes are drawn to their exact sizes.
Circles cannot be drawn using compasses.

3. Isometric Drawings - Crates
A crate is something that will help you draw isometric drawings.
They can be used for small parts of the drawing to simplify the bigger drawing.

4. Isometric Drawings - Crates
Begin constructing your crate by drawing the 2 lines at 30° to the horizontal and the vertical line of the front corner.
30°
30°

5. Isometric Drawings - Crates
Next mark on the height of the crate and the lengths of the sides.
These lengths are all full size as described on your drawing.

6. Isometric Drawings - Crates

7. Isometric Drawings - Circles
You cannot draw circles in an isometric drawing using compasses.
You must convert a circle into sectors and transfer points of the circle onto an isometric grid.

8. Isometric Drawings - Circles
The face of the cylindrical bar is circular as drawn below.

9. Isometric Drawings - Circles
To draw this face is an isometric drawing we have to split it up into sectors.
To do this we use a 30/60 set square and draw a clockface on the circle.

10. Isometric Drawings - Circles
To draw this face is an isometric drawing we have to split it up into sectors.
To do this we use a 30/60 set square and draw a clockface on the circle.

11. Isometric Drawings - Circles
To draw this face is an isometric drawing we have to split it up into sectors. 12 1 11 10 2
To do this we use a 30/60 set square and draw a clockface on the circle. 9 3 8 4 5 7 6

12. Isometric Drawings - Circles
Now project lines across from the marks on the circle to the centre line. 12 1 11
Use your parallel slide on your drawing board to do this. 10 2 9 3 8 4 5 7 6

13. Isometric Drawings - Circles
Now create a grid on your isometric crate to help you draw the isometric circle.
Length  
Length 
The crate should be drawn to the diameter of the face being the length and breadth of one face and the depth being the other dimension.

14. Isometric Drawings - Circles
First, draw the centre lines on the face of the crate.

15. Isometric Drawings - Circles
Then, draw the construction lines from the circle. You can use a compass to find the distance between each of the lines. 12 11 1 10 2 9 3 8 4 5 7 6

16. Isometric Drawings - Circles
Now, use a compass to mark along the lines the distance to where the circle would cross them. 12 11 1 10 2 9 3 8 4 5 7 6

17. Isometric Drawings - Circles
Finish marking all the points using this technique. 12 11 1 10 2 9 3 8 4 5 7 6

18. Isometric Drawings - Circles
Now complete the isometric circle by joining up the points. This curve should be drawn freehand and should be smooth. 12 11 1 10 2 9 3 8 4 5 7 6

19. Isometric Drawings - Circles
To complete the cylinder extend the length back and project the length from the front face to the back face and complete the curve.