Engineering drawing

1. John Ogilvie High School
Department Of Technical Education
Graphic Communication

2. Department Of Technical Education
Cut Hexagonal Prism - Question
The given views show the Front Elevation and
Plan of a cut hexagonal prism.
Draw the following views :-
End Elevation
Surface Development of sides
True Shape of cut

3. Department Of Technical Education
Finding position of End Elevation
Project the outline of the End Elevation from the
Front Elevation and the Plan.

4. Department Of Technical Education
Identifying Generators
Number each of the points on each of the views.
1 2
6 3
5 4
1/2 3/6 4/5 6 1 /5 2 /4 3

5. Department Of Technical Education
Finding Cut Surface on End Elevation
Project from the cutting line on the Elevation to
find the cut points on the End Elevation.
Join each of the points to find the cut shape on
the End Elevation
1 2
When you are sure that the view is correct,
6 darken the outlines of the End Elevation.
3
5 4
1/2 3/6 4/5 6 1 /5 2 /4 3

6. Department Of Technical Education
Drawing Surface Development (1)
To draw the Development of the sides of the
prism, project the base line and the height from
the Front Elevation.
Draw a vertical generator to indicate where the
Development will start, and then step out the
1 2 width for the six sides. Draw generators through
each of these points.
Number each of the generators starting with
6 either the highest point or the lowest point.
3
Project each of the cut points from the Elevation
onto the appropriate Development generator
5 4 and draw straight lines to indicate the shape of
1/2 3/6 4/5 6 1 /5 2 /4 3 the Development.
3 4 5 6 1 2 3

7. Department Of Technical Education
Drawing Development (2)
Darken the outlines of the Development.
Add ‘fold lines’ to the Development to indicate
where the corners are.
1 2
6 3
5 4
1/2 3/6 4/5 6 1 /5 2 /4 3
3 4 5 6 1 2 3

8. Department Of Technical Education
Drawing True Shape of cut surface
To find the True Shape, project the cut points
away from the Front Elevation at right angles to
2
the cut.
3
1 Draw a datum line on the True Shape parallel to
the cut line of the Front Elevation and at right
1 2
angles to the lines just projected. Also add a
datum line to the plan.
4
6 6 Measure the vertical distances from the datum
3
5 to each of the cut points. Transfer these sizes
onto the True Shape.
5 4
Number each of the points and join them to
produce the True Shape.
1/2 3/6 4/5 6 1 /5 2 /4 3
3 4 5 6 1 2 3

9. Department Of Technical Education
Finishing the drawing
To finish the drawing darken the outlines of the
True Shape
2
3
1
1 2
4
6 6 3
5
5 4
1/2 3/6 4/5 6 1 /5 2 /4 3
3 4 5 6 1 2 3

10. Department Of Technical Education
PowerPoint Presentation produced by John McRae, Nairn Academy 2003