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Drawing to scale generic
- 1. Drawing
- 2. Drawing
- 3. Drawing Labels = iron sheet Key = wire mesh 2.4 m Scale 1.2 m 1m 1.5 m 2m 1.5 m 1:10 SCALE 1 cm on drawing = 10cm in real life
- 5. Activity – Team 2
- 6. Activity – Team 3
- 7. Scale 150 10cm in real life = 1 cm on drawing 1.5 metres = _____ centimetres (in real life) 15 ___ centimetres (on drawing) 1:10 20 ___ centimetres (on drawing) 2 metres 200 = _____ centimetres (in real life)
- 8. Scale 1:100 1:100 5m 5cm 5cm 5m 1:10 1:2 7m 70cm 2cm 4cm 1:2 1:20 1m 50cm 4cm 0.8m 1:50 1:50 10m 20cm 4cm 2m
- 9. Scale side roof SCALE
- 10. Your Turn! Now complete side and top views of your design! SCALE
- 12. Drawing Triangles 1.2 metre 1.2 metre 2 metres 12 centimetres 12 centimetres 1:10 12 centimetres 20 centimetres 12 centimetres
- 13. Drawing Triangles SCALE SCALE SCALE Use the same SCALE as you did before
- 14. Your Turn! Now complete the end view of your design! SCALE
Editor's Notes
- This lesson is about drawing to scale and why it is useful. Students need to be aware of the units of metres and centimetres and how to convert between them in order to complete the lesson. They must also understand how to multiply and divide, as well as having access to a calculator, pencil and compass.
- Revision slide from previous lecture. Why is drawing important? - Communication of ideas
- Drawings need dimensions and materials lists. Scales are better than labels, as it takes less work when you have a complex drawing. Also, if you need to know a dimension which is not labelled, it can simply be measured from the drawing using a ruler.
- Ask each team to go and measure all the dimensions of a small structure on site. In this example, one team measures the bamboo hut, another measures the weather station, and the last group measures a chicken hut. Each team will draw different views of the structure they measured throughout the course of the lesson.
- Self explanatory slide showing how scale works.
- Left hand side of slide: Ask the students to draw each line to scale, using the scales used. Go through the examples one at a time, and ensure everyone understands. Right hand side of slide: ask the students to identify the real life length of each line.
- Ask the students to draw the roof and the side views to scale. The chicken hut can use a scale of 1:10, the weather station should use a scale of 1:5, and the bamboo hut should use a scale of 1:20.
- Ask the students to draw side and top projections of their designs. It is a good idea to discuss scale before they start. As an example, let us say the largest dimension on the design is 10m. You want the drawing to fill the page, so select an easy number that will fit on the page, for example 20cm. You can now say that 20cm on the drawing represents 10m in real life, or 20cm represents 1000cm in real life. You always try and write scale in its simplest, smallest form, so this scale would be 1:50, or 1cm on the drawing represents 50cm in real life.
- Another shape it is useful to learn to draw accurately to scale is the triangle.
- To draw a triangle, start by drawing the base of the triangle. Set the compasses to match the scaled length of the other sides of the triangle. Place the end of the compass on the end of the base line. Draw an arc. Place the compass on the other end of the base line, and draw another arc. The point where they cross is the top of the triangle. Draw in the remaining sides of the triangle.
- Ask the students to draw the end views of the chicken hut, bamboo hut and weather station to scale.
- Ask the students to draw end projections of their designs. It is a good idea to discuss scale before they start. As an example, let us say the largest dimension on the design is 10m. You want the drawing to fill the page, so select an easy number that will fit on the page, for example 20cm. You can now say that 20cm on the drawing represents 10m in real life, or 20cm represents 1000cm in real life. You always try and write scale in its simplest, smallest form, so this scale would be 1:50, or 1cm on the drawing represents 50cm in real life.