Lesson 7 Development of cones with a cut surface.

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Presentation transcript:

Lesson 7 Development of cones with a cut surface

Draw the surface development of a truncated cone with a diameter of 50 height of 110mm. At 25mm away from cone draw a 30° Plane to cut the cone, Create generators Develop surface as before.

To develop a cone you need to know the true length of the generator and the length of the circumference of the base. Once the compass is set to the true length the development can be drawn anywhere Here it is drawn from the side of the elevation. The distance between the points is stepped off 12 times. Draw a circle for the base.

Label and mark off the height of each generator. Cut Generator