1. Hexagonal Pyramid cut at an angle #1
Drawing Abilities Teacher
Hexagonal Pyramid cut at an angle #1
© J Lewis 2004

2. Orthographic projection
The complete Elevation and partial Plan of a hexagonal pyramid are given below
The pyramid is cut by plane AB and the upper section is removed
Number the six edges on the Elevation and Plan as shown
© J Lewis 2004

3. Drawing construction lines
Draw vertical construction lines from the Elevation to the Plan.
The points projected are those where the edges are cut by the plane AB.
Where the construction lines cross the same numbered edges on the Plan, points for the Plan are obtained.
Elevation of the pyramid before cutting
© J Lewis 2004

4. Completing the Plan view
Join the points as shown
Plan view after cutting
© J Lewis 2004

5. Starting the End Elevation
Construct the outline of the End Elevation.
Edge 5 is at the front and the construction lines are as shown
Take care that the Elevation shows 3 sides but the End Elevation shows 2
End Elevation – 2 sides !
© J Lewis 2004

6. Starting the End Elevation
Draw the horizontal construction lines from the plane AB to the End Elevation
© J Lewis 2004

7. Completing the End Elevation
Join the points as shown – note that where a line is cut in one view, it is cut in the same place in every other view.
Elevation
End Elevation
© J Lewis 2004

8. Drawing the True Shape
Draw construction lines at right angles to the cut surface – this gives the True Length for the surface
Draw a Datum line parallel to AB as shown
© J Lewis 2004

9. Drawing the True Shape
Draw lines, as shown, which are the same length as 1-3 and 6-4 on the End Elevation
© J Lewis 2004

10. Drawing the True Shape Join the points to generate the True Shape
This is the view with the cut surface at right angles to the direction of viewing
© J Lewis 2004

11. Surface Development
Mark the various heights on to the right hand edge which is a True Length of side.
© J Lewis 2004

12. Surface Development
Redraw the True Length line from the last slide as shown
Draw an arc of this radius
Step off the 6 sides of the base as seen on the Plan around the arc
© J Lewis 2004

13. Surface Development
Swing the various heights from the True Length line on to their respective edges
© J Lewis 2004

14. Surface Development
Construct the points on the correct radius as shown
© J Lewis 2004

15. Finished Surface Development
Join the points as shown to complete the Surface Development
© J Lewis 2004

16. Completed drawing
© J Lewis 2004