St Margaret’s Academy

CDT CDT Department Department

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Cylinders

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.

Cylinders

The elevation and end elevation of an uncut cylinder is a rectangle.

The plan of an uncut cylinder is a circle.

Cylinders

Elevation

Plan

End Elevation

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.

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.

Cylinders

The Elevation is the given view.

From this we will produce the Plan and the End Elevation.

Elevation

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

Cylinders

Elevation

Plan

To draw the End elevation, first draw a 45° bounce line from the top right hand corner of the Elevation.

Cylinders

Elevation

Plan

Then project the sizes from the Plan across to the bounce line then vertically down.

Cylinders

Elevation

Plan

Now project the sizes from the Elevation across the page horizontally.

Cylinders

Elevation

Plan

Darken in the outline of the shape.

Cylinders

Elevation

Plan

End Elevation

This is a clearer view of the End Elevation of the bottle.

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.

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.

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!

Cylinders - the Development

To do this we use a 30/60 set square and draw a clockface on the circle.

Plan

Cylinders - the Development

To do this we use a 30/60 set square and draw a clockface on the circle.

Plan

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.

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