technology

What are the two classes of plastic ?
thermoplastics and thermosetting plastic
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What is the difference between the two types of plastic ?
thermoplastics can be reshaped by applying heat and thermosetting plastics cannot
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Which plastic would would you chose to protect a china ornament by post ?
expanded polystyrene
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Which plastic has the properties required for making a saucepan handle ?
Melamine formaldehyde
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What is the difference between ferrous and non-ferrous metals ?
ferrous metals contains iron and is not resistant to corrosion . Non-ferrous metals do not contain iron and are resistant to corrosion .
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What is the main advantage of using stainless steel instead of mild steel ?
stainless steel is very strong and resistant to corrosion . Mild steel is not resistant to corrosion and can have impurities .
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which tools are used to scratch lines on metal ?
a scriber , an engineer's square or spring dividers
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How can scratches on metal be made to show up more clearly ?
you can wipe dye onto the surface so that you can see the line made .
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what should you use to mark metal before you drill ?
You should use a centre punch to mark onto metal before you drill because it will stop the drill from slipping .
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What is the purpose of a chuck on a pillar drill ?
it is to hold the bit into place
10 of 19
Explain what a pilot drill is used for ?
a pilot drill is to provide a guide for a large hole and to stop wood from splitting .
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What are good quality drill bits made from ?
high speed steel
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why is a pillar drill so called ?
its main parts can be made to slide up and down the central pillar
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when using a hole saw how would you prevent the wood from splitting ?
When using a hole saw drill through to nearly the end and turn the wood over and drill through .
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Explain the term plastic memory
plastic memory is when you mold plastic and then reheat it , it will try and return to the original shape .
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How can the flange be cut away from a moulding ?
the flange can be cut away using a profile router . this machine uses a spinniing abrasive disc that can be set at different heights
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why are vacum forming moulds made with drafted edges ?
vacum forming moulds are made with drafted edges to make it easier to separate plastic and mould at the end .
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what does the term CAD/CAM stand for ?
computer aided design and computer aided manufacture
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list three advantages of using CAD
faster accurate drawings
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Other cards in this set

Card 2

Front

What is the difference between the two types of plastic ?

Back

thermoplastics can be reshaped by applying heat and thermosetting plastics cannot

Card 3

Front

Which plastic would would you chose to protect a china ornament by post ?

Back

Preview of the front of card 3

Card 4

Front

Which plastic has the properties required for making a saucepan handle ?

Back

Preview of the front of card 4

Card 5

Front

What is the difference between ferrous and non-ferrous metals ?

Back

Preview of the front of card 5
View more cards

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