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Year 12 DT Exam

Terms in this set (19)

What are two benefits of using lamination to manufacture a curved beam?
The sections are easier to bend
The beams are more stable
Explain two reasons why PVA was used in the bridge?
It dries quickly which will reduce the manufacturing time
It dries clear meaning no extra cleaning or staining is required
What are two suitable wood composite materials that could be used for the web in an I-beam?
Plywood
MDF
Answer to maths question 1?
1440cm^3
Outline the process of setting up and cutting the base of a game board using a CNC router
Design on CAD
Specify cutting oder
Send to CNC router
Specify material
Specify thickness desired
Simulate
Extraction system
Zero
Start
Explain three performance characteristics that make oak suitable timber from which to manufacture the base of the game
Strong so will be resistant to breaking under stress
Hard so won't scratch easily
Stable so won't warp or twist
Durable so can resist general wear
Name two suitable materials that could be used to rotationally mould the base of the game
PVC
Low density polyethylene
Explain two benefits of using rotational moulding in preference to injection moulding when producing the base of the game
No seams so welding or joining is not required meaning less time
No weak points or joints so is less likely to break
Explain two advantages of milling the aluminum component shown in figure 5 from a solid piece of material rather than making it from two separate pieces
Extra steps are required to join the two pieces which would take more time
The finished piece is more likely to be flush as there is no aligning required
Give two advantages of making the component by joining two pieces together rather than machining it from one solid piece
Reduced amount of material cut away
Stock is less valuable as no large pieces
Explain two advantages of anodising in preference to painting for the component
As anodising goes below the surface of the metal, it is harder to scratch the object
Anodising fluids are viscous enough to seap into any gaps and so it covers the whole product
Answer to L shape maths question?
84300mm^3
What are two characteristics of ABS that make it suitable for a lego toy?
Durable which makes the toy last longer meaning you don't have to replace it
Hard so doesn't scratch meaning no dirt gets into scratches making it more hygenic
Explain two reasons why die casting is the method chosen to make the batch of aluminium building blocks
High quality finish meaning no further finishing is required
The die is re-used meaning it is an economical method of production
Answer to table maths question
18,120,850mm^3
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