Hex Prisms

1
Graphic Communication
Hexagons Hexagonal Prisms
CDT Department
2
Hexagons

• Hexagons are 6 sided shapes.
• Hexagons can be dimensioned in 2 different ways.
• 1. Across the faces.
• 2. Across the corners.

3
Hexagons- Across the Faces
The dimension of the hexagon is taken from one
face to the opposite face.
4
Hexagons- Across the Corners
The dimension of the hexagon is taken from one
corner to the opposite corner.
5
Hexagons - How to draw them
Draw circle at the required size.
If the hexagon is to be 50mm across the corners
or (AC) the draw a circle Ø50.
If the hexagon is to be 50mm across the faces or
(AF) the draw a circle Ø50.
6
Hexagons - How to draw them
For hexagons across the flats use your 30/60
set square to draw the lines to make up the
hexagon.
The hexagon should be drawn outside the circle.
7
Hexagons - How to draw them
For hexagons across the corners use your 30/60
set square to draw the lines to make up the
hexagon.
The hexagon should be drawn inside the circle.
8
Hexagonal Prisms

• Hexagonal prisms are similar to cylinders but
  instead of having a circular cross section they
  are hexagonal.

9
Hexagonal Prisms - the Elevation
Now we will draw the Elevation of the hexagonal
prism.
Height
Height
We see each of the faces as rectangles with the
widest being the centre.
Elevation
10
Hexagonal Prisms - the Plan
Now we will draw the Plan of the hexagonal prism.
Project the lines up from the Elevation.
Elevation
11
Hexagonal Prisms - the Plan
Then use your 30/60 set square to complete.
Plan
Elevation
12
Hexagonal Prisms - the End Elevation
Draw a 45 from the top right hand corner of the
Elevation.
This 45 line is called a bounce line.
Plan
Elevation
13
Hexagonal Prisms - the End Elevation
Project the depth of the block across to the
bounce line then where they intersect project
down.
Plan
Elevation
14
Hexagonal Prisms - the End Elevation
Now project the heights across from the Elevation
to complete.
Plan
Elevation
End Elevation
15
Hexagonal Prisms - the Completed Orthographic
Plan
Elevation
End Elevation
16
Hexagonal Prisms - With Cuts

• Sometimes the top or the bottom (or both of
  these) are chopped off the prism. This could be
  if the prism was for a label or storage for
  something.
• So how do we draw this?
• The next few slides will show us.

17
Cut Hexagonal Prisms - the Elevation
Either the Elevation or End Elevation will
normally be given drawn for you.
Therefore, you will have to be able to identify
them.
Spot the cuts
Elevation
18
Cut Hexagonal Prisms - the Plan
Project the lines up from the Elevation as shown.
Elevation
19
Cut Hexagonal Prisms - the Plan
Use your 30/60 set square to complete the normal
hexagonal shape.
Even though the top and bottom of the prism have
been cut, the outline from the plan view remains
the same.
Plan
Elevation
20
Cut Hexagonal Prisms - the Plan
Now project up the lines from where the cuts are
made.
Plan
Elevation
21
Cut Hexagonal Prisms - the Plan
Now darken in these lines on the plan.
You wont be able to see the cut on the bottom of
the prism so it will be drawn as a hidden detail
line.
Plan
Elevation
22
Cut Hexagonal Prisms - the End Elevation
Now that the plan is complete we have to draw the
End Elevation.
Before we can draw our 45 bounce line we have to
find out where the top right hand corner of the
Elevation is.
Plan
To do this extend the top across and the side up.
Draw your 45 bounce line from where they cross.
Elevation
23
Cut Hexagonal Prisms - the End Elevation
Project the depth of the block across to the
bounce line then where they intersect project
down.
Plan
Elevation
24
Cut Hexagonal Prisms - the End Elevation
Now project the heights across from the Elevation
to complete.
Plan
Elevation
End Elevation
25
Cut Hexagonal Prisms - the End Elevation
This shape looks awkward but remember, there are
6 corners and faces of the shape so the cuts can
only go to the corners.
Plan
Elevation
End Elevation
26
Hexagonal Prisms - the Development

• A development is a flat template of a 3D shape
  that when folded up in the correct way makes the
  actual shape of the 3D object.
• Developments are particularly useful when
  modelling new design ideas or to prepare for
  folding shapes in sheet metal.

27
Hexagonal Prisms - the Development
Here the development of the sides will be drawn.
This does not include the top and bottom of the
prism.
Project the height of the prism across the page.
Plan
Elevation
28
Hexagonal Prisms - the Development
Now, using a compass, step out the lengths of
each side onto these lines.
Draw vertical lines at each of these points.
Plan
Elevation
29
Hexagonal Prisms - the Development
6
1
To make things easier we number each of the
corners of the hexagon.
2
5
Do this as shown on the Plan, Elevation and
development.
4
3
1
2
3
4
5
6
1
Plan
A development always starts and ends with the
same numbered corner. When it folds up these
should meet.
Here one number is above the other. This is
because corner number 3 is in front of corner 1.
5
4
2
3
Elevation
1
6
30
Hexagonal Prisms - the Development
6
1
Project the cuts across onto the development
marking the appropriate corners as you go.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
31
Hexagonal Prisms - the Development
6
1
Project the cuts across onto the development
marking the appropriate corners as you go.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
32
Hexagonal Prisms - the Development
6
1
Project the cuts across onto the development
marking the appropriate corners as you go.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
33
Hexagonal Prisms - the Development
6
1
Project the cuts across onto the development
marking the appropriate corners as you go.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
34
Hexagonal Prisms - the Development
6
1
Project the cuts across onto the development
marking the appropriate corners as you go.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
35
Hexagonal Prisms - the Development
6
1
Project the cuts across onto the development
marking the appropriate corners as you go.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
36
Hexagonal Prisms - the Development
6
1
Now join your dots up to complete the
development.
2
5
As the hexagonal prism has no curves, use a
straight edge to join the dots.
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
37
Hexagonal Prisms - the Development
6
1
Here is a clearer view of the complete
development.
2
5
4
3
1
2
3
4
5
6
1
Plan
5
4
2
3
Elevation
1
6
38
Hexagons Hexagonal Prisms

• Hexagons are 6 sided shapes.
• Hexagons can be dimensioned A/F or A/C.
• The corners should be numbered when drawing
  hexagonal prisms to make it easier to tell where
  cuts go.
• A development will fold up to make a 3D model of
  the object.