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| CAD |
computer-aided design: the
designer uses the computer to help with the production of the design 'on
screen' instead of developing the design by drawing on paper or making 3D
models |
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| Cathode |
This is the negative
electrode in a circuit.
It is commonly linked with diodes
and thyristors. It is the
opposite of anode.
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| CAM |
computer-aided
manufacture: using
a computer to control the machine tools that make a design |
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| Cam |
a
non circular wheel that rotates and moves a follower. It
converts the rotary movement of the cam into reciprocating
or oscillating movement of the follower. Sometimes a
circular wheel mounted off-centre onto a shaft is used as a cam we then
call it an eccentric |
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| Cantilever |
a beam
supported at only one end |
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| Capacitor |
a component
which stores electric charge |
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| Carbohydrates |
sugars
and starches |
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| Carbon
Fibre |
a resin
with threads of carbon sealed in it |
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| Carbon
Steel |
steel with an
excess of carbon |
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| CAT |
computer-aided
testing |
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| CD
Rom |
compact disc read only memory |
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| Centre
Square |
a device used to find and mark the centre of a
circle |
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| Changeover |
Double
throw contacts (on a switch or relay) |
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| Characteristics |
the physical
properties of a
particular material; e.g. its hardness, strength and stiffness |
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| Charge |
is gaining electrons (-ve charge)
or losing electrons (+ve charge) from an atom of material. |
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| Chassis |
the
frame upon which a vehicle is built |
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| Chill
(1) |
to cool below 80C |
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| Chill
(2) |
to cool the
surface of a metal rapidly |
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| Chipboard |
a
board made from compressed wood chips |
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| Chisel |
a
tool (often used with a mallet) to remove wood when making joints |
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| Chuck
Key |
A device used to
tighten a drill chuck |
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| Circuit |
an arrangement of components that
provides a continuous pathway through which an electric current
can flow |
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| Circuit
Symbol |
a
drawing that represents a component
in a circuit diagram |
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| Circuit
Diagram |
a drawing |
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| Circumference |
the
distance around the outside of a disc, wheel
or pulley. |
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| Clamping |
holding
pieces of material together using a vice
or G-clamp |
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| Clay |
a
mineral substance formed when rocks are 'weathered' or broken down by
water. Clay is used with graphite to
make the lead in pencils. |
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| Closed
loop |
a system
with feedback |
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| Client |
a person using the services of a designer. In
school the client is likely to be the person who is going to use the final
product but in the world outside school the client is often a manufacturer
and it is their customers who use the final product. |
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| CMOS |
complementary
metal oxide semiconductor (a method of manufacturing integrated
circuits) |
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| Component |
the name given to one of the parts that make up a
product |
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| Compliant
Materials |
textiles,
paper and other easily worked materials |
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| Composite
Materials |
a
material composed of two or more other materials |
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| Compressive
Force |
a
squashing force |
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| Coping
saw |
a
saw with a thin blade used for cutting curves in wood or plastic |
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| Conductor |
any material that allows electric current
to pass through it |
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| Coniferous |
an
evergreen tree that produces cones |
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| Construction
Kit |
a set of parts that can be assembled into a
variety of working models which can then be taken to pieces e.g. Lego,
Fischer Technik or Meccano. |
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| Constraint |
a
restriction imposed by a design or by a client which a designer must take
account of |
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| Consumables |
materials used to make products e.g. paper, card,
wooden strip, plastic sheet, metal rod. These materials get used up and
have to be replaced. |
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| Consumer |
anyone who purchases goods or services |
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| Continuous
Production |
mass
production which never stops except for breakdown and maintenance. |
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| Control |
the name given to that part of design and
technology concerned with making mechanical, electrical and electronic
devices work in the way they were intended |
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| Corrugated |
a method of constructing sheet materials that is
light yet strong and stiff |
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| Craft
Knife |
a sharp single bladed knife used to cut paper,
stiff card and sheet plastic |
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| Crating |
using
lightly drawn boxes as guides when drawing 2D and 3D objects |
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| Criteria |
requirements
which must be met or the standards by which design success is measured |
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| Cross-section |
a cutaway
view showing the surface that would be left if you cut through
something |
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| Crystal
Lattice |
This is the orderly,
stable structure of the atoms in most metals (except mercury)
when they are in their normal solid state. |
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| Current |
the flow of an electric charge
through a conductor. |
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| Cutaway
view |
a drawing that shows the construction and
internal detail of an object by showing the outer parts 'cut away'. More
accurately called a sectional view |
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Cycle |
the period of time taken to finish one
routine |
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