This term, our topic is D&T based. We are learning how to create our own dragon toy, which will have a moving part.
The D&T curriculum has 4 key components: design, make, evaluate and technical knowledge. We will work through these components to make the best model we can.
- generate, develop, model and communicate their ideas through discussion, annotated sketches, cross-sectional and exploded diagrams, prototypes, pattern pieces and computer-aided design
- select from and use a wider range of tools and equipment to perform practical tasks [for example, cutting, shaping, joining and finishing], accurately.
- select from and use a wider range of materials and components, including construction materials, textiles and ingredients, according to their functional properties and aesthetic qualities.
- evaluate their ideas and products against their own design criteria and consider the views of others to improve their work.
- understand and use mechanical systems in their products [for example, gears, pulleys, cams, levers and linkages].
In our D&T lesson today, we have explored how to create cams, in preparation for making our own moving dragon model. We explored the different types of cam and different materials we could use. We discovered:
- A round cam won’t impact the movement (rise and fall) as there isn’t an opportunity for a dwell.
- A hexagon cam will cause the follower to momentarily rise when the corner presses against the lolly stick.
- An egg-shaped cam will cause the follower to rise for half the cycle as the pointed part is pushed up and then it will dwell.
- An ellipse cam will cause the follower to rise when the cam is at the point.
- The eccentric cam will cause the follower to rise when it is at its furthest point away from the connection.
- The snail cam causes the follower to dwell then rise slowly, until it suddenly falls quickly into the removed section.