Manipulating and Joining

Question 1

What is Chinagraph pencil used for and what evaluate it?

Answer 1

It is used for MARKING OUT as it can be wiped off easily, however sometimes it can be too thick to follow.

Question 2

What is a disadvantage of using a non-permanent marker?

Answer 2

It can be smudged easily

Question 3

When is permanent marker used?

Answer 3

When progress is more important than high-quality finish. So good for early models

Question 4

There is 0.5 HIPS sheet, what method can be used to cut it. Explain why

Answer 4

A scissor because it is suitable to cut fast for thin sheets

Question 5

Describe the process of cutting with a craft knife.

Answer 5

Used to cut thicker sheets.
First SCORE along a line
Then FLEX the material until it SNAPS

Question 6

When do we use Scroll-saws and what do we have to make sure whilst using it and why.

Answer 6

Scroll saw used to cut curved shapes
We must make sure to leave protective layer on as…
the cut may re-seal due to plastic dust heat up.

Question 7

Coping Saw used where?

Answer 7

To cut CURVES in THIN sheets

Question 8

Junior hacksaw used to cut…
fill in the blanks

Answer 8

sections

Question 9

Why might someone use band saw?

Answer 9

To cut precise, SHALLOW curves and larger lines

Question 10

Explain laser cutter usages

Answer 10

It is used to cut and engrave in 2D acrylic sheets. Hence used for decorative pieces.

Question 11

Limitation of laser cutter

Answer 11

The size of the sheet.

Question 12

Usage of milling machines.

Answer 12

to cut slots and grooves in blocks of suitable polymer

Question 13

What can be used to cut more complex shapes?

Answer 13

CNC milling machines

Question 14

central lathes usage

Answer 14

To make round components

Question 15

What is CNC Lathe used for?

Answer 15

To cut more complex shapes

Question 16

What is the difference between milling and multi-axis milling?

Answer 16

> > Milling machines move on 3 axes but multi-axis milling machine move son 4 axis.
A bit like lathe that could stop partway to let milling machine cut some slot.

Question 17

Why is it important to have the correct drill bit?

Answer 17

So the polymer doesn’t whip or crack.

Question 18

Larger the hole, slower the speed of drill, explain why?

Answer 18

The high speed can melt the plastic.

Question 19

A person wants to bend a line on an acrylic sheet, describe how they would do it?

Answer 19

They would use a LINE BENDING.
1) They would use a STRIP HEATER to heat a material over a heated line.
2) Then use a JIG or a FORMER to bend the sheet to the desirable angle until it cools.

Question 20

When is Drape forming used and how

Answer 20

Used when a LARGE CURVE needed
1) Sheet HEATED IN OVEN to ensure the sheet is evenly heated
2)One softened, DRAPED over a FORMER and pulled tightly by a piece of cloth until cooled.

Question 21

Explain the components of press moulding and how it is done

Answer 21

Yoke is the upper piece and plug is the bottom piece.
1) HEAT the sheet in OVEN. to ensure the sheet is heated evenly.
2) Position over plug and pushed downwards by the yoke and clamped together until sheet cooled.

Question 22

Vacuum forming and how it is done?

Answer 22

1)Sheet clamped to form air-tight sheet above the air chamber and mould.
2) Once heated the mould is raised and air evacuated by air pump. so air pressure forces the sheet to shape itself along the mould.

Question 23

Explain why the mould’s and plug has to tapered or have draft angle, and rounded edges?

Answer 23

So it can be removed easily

Question 24

How to make recesses in vacuum forming?

Answer 24

Use vent holes to allow air pressure press the heated plastic into the holes.