st margaret’s academy cylinders. cylinders are shapes that have a circular cross section and a...
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St Margaret’s Academy
CDT CDT Department Department
Gra
phic
G
raphic
C
om
munic
ati
on
Com
mu
nic
ati
on
Cylinders
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Cylinders
Cylinders are shapes that have a circular cross section and a depth.
They are used in shapes of bottles and their developments are used for labels.
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Cylinders
The elevation and end elevation of an uncut cylinder is a rectangle.
The plan of an uncut cylinder is a circle.
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Cylinders
Elevation
Plan
End Elevation
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Cylinders
However, it is unlikely you will be asked to draw a cylinder that has not been cut.
The difficulty in drawing cylinders is that there are no corners to project distances and cuts from.
We have to make our own by constructing a clockface.
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Cylinders
A new shape for a bottle is shown on the right.
The views given are frontal and from the back.
We will draw the Elevation, End Elevation and the Plan of the bottle.
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Cylinders
The Elevation is the given view.
From this we will produce the Plan and the End Elevation.
Elevation
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CylindersThe plan has an angled cut taken from it going across the middle.
The cut taken from the front of the cylinder cannot be seen from above. Therefore, it is shown as hidden detail.
Elevation
Plan
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Cylinders
Elevation
Plan
To draw the End elevation, first draw a 45° bounce line from the top right hand corner of the Elevation.
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Cylinders
Elevation
Plan
Then project the sizes from the Plan across to the bounce line then vertically down.
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Cylinders
Elevation
Plan
Now project the sizes from the Elevation across the page horizontally.
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Cylinders
Elevation
Plan
Darken in the outline of the shape.
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Cylinders
Elevation
Plan
End Elevation
This is a clearer view of the End Elevation of the bottle.
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Cylinders - 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.
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Cylinders - the Development
In order to draw a development of a cylinder we have to first construct ways of transferring sizes across from the elevation to the development.
We do this by constructing a clockface on the Plan view, then projecting this down to the Elevation and then across onto the development.
The next few slides show this happening.
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Cylinders - the Development
It is important that when you draw your own cylinders that you keep any construction lines very light!!!
You will see that there are a lot of construction lines. If you do not keep them light you will end up very confused!
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Cylinders - the Development
To do this we use a 30/60 set square and draw a clockface on the circle.
Plan
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Cylinders - the Development
To do this we use a 30/60 set square and draw a clockface on the circle.
Plan
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Cylinders - the Development
To do this we use a 30/60 set square and draw a clockface on the circle.
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Cylinders - the Development
Project these points down onto the Elevation.
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Number these projection lines. The points in front are written above those that are at the back of the Elevation.
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Cylinders - the Development
Project the height of the Elevation across the page.
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Cylinders - the Development
Using a compass, step out the distances between each point on the plan onto this top line from a start point.
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Cylinders - the Development
Project vertical lines down from these points.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Project horizontal lines across from the Elevation at where the construction lines meet the curved cuts first.
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Cylinders - the Development
Sketch in 4 smooth freehand curves that join these dots. You should also darken the outline for the development.
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Cylinders - the Development
Now we will draw in the rectangular cut part. As the ends of this part do not lie on a projection line from the plan we have to make our own.
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Cylinders - the Development
Project up from the Elevation to the plan from the 2 ends of the rectangular part.9
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Cylinders - the Development
Using your compass, mark from point 7 going towards point 8 the distance shown. 9
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Cylinders - the Development
Draw a vertical line here.9
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Cylinders - the Development
Using your compass, mark from point 5 going towards point 4 the distance shown.
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Cylinders - the Development
Draw a vertical line here.9
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Cylinders - the Development
Now project across horizontally from the Elevation the points for the rectangular part.
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Cylinders - the Development
Now darken in this rectangular part on the development.
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Cylinders - the Development
This is the completed Plan, Elevation and the development shown without any construction lines.
Plan