Top Down and Bottom Up Modelling Questions
Top Down and Bottom Up Modelling Questions
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Below are questions to test your knowledge and understanding of Top Down and Bottom Up Modelling.
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Question 1
Question 1
An exploded view of a record arm head is shown. a. Explain, giving two reasons, why using top-down modelling would benefit the CAD technician when modelling the needle cartridge. (2 marks)
Answers
Answers
a. (Answers to explain questions must have a cause and an effect.)
- The sizes and positions of the holes of the needle cartridge can be projected from the tonearm head
- The needle cartridge would be modelled in the correct position and would not need to be constrained into place
- If changes are made to one component, this will dynamically update all other components
Question 2
Question 2
A CAD technician has created a 3D model of a coffee machine, shown below. The coffee machine has multiple components, and some have been labelled.
a. Describe the benefits of using top-down modelling to create the wand cap. (2 marks)b. Bottom-up modelling was used to create other components of the coffee machine. Describe the process of bottom-up modelling. (2 marks)
Answers
Answers
a.
- Geometry or dimensions can be projected to ensure an exact fit between the components
- Components can be modelled in situ and will not need constraints to assemble
- Any changes to one component will dynamically change the other component(s)
- Components are modelled individually
- They can be inserted into an assembly to assemble using constraints
- Any changes to a component will need to be made by editing it individually
Question 3
Question 3
Bottom‑up modelling was used to create the components of the clock.
a. Describe the process of bottom‑up modelling. (2 marks)
Answers
Answers
a.
- Components are modelled individually
- They can be inserted into an assembly to assemble using constraints
- Any changes to a component will need to be done by editing it individually
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