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| Salting |
a
method of preservation involving packing food in layers of salt |
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| Sand
paper |
an abrasive
paper used to smooth the rough edges of freshly sawn wood |
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| Sanding
Block |
a piece of cork or wood or plastic which glass or
sandpaper can be wrapped around when sanding. |
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| Scale
of Production |
the
size of a production run, i.e. one-off, batch,
mass and continuous |
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| Scale |
the
size of a model compared to the real thing |
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| Scissors |
a hand tool that is used to cut paper, thin card
and fabric |
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| Seam |
used
to join pieces of fabric together |
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| Seasoning
(1) |
reducing
the moisture content of newly felled timber before use |
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| Seasoning
(2) |
adding
salt, pepper and other ingredients to improve the flavour of food |
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| Secondary
research |
research collected and published by others |
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| Sectional
view |
a
cutaway view showing internal details |
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| Semiconductor |
a
silicon based material or electronic component that can be made to act
like a conductor or an insulator. |
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| Sensor |
a component
such as an LDR that can detect changes in its surroundings
e.g. a light sensor can detect changes in brightness, a heat sensor can
detect changes in temperature. |
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| Series |
arrangement
of terminals, so that components are placed end to end with unlike poles
connected together |
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| Shaft |
a rod that rotates and normally has pulleys,
sprockets or gear
wheels attached to it. |
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| Shear |
a
force which acts to rip or tear a material |
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| Sheet
Material |
a form of material where the length and
width are much greater than the thickness e.g. paper, card, fabric,
corrugated plastic |
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| Shell
Structure |
a structure composed of a single piece of sheet
material formed
to provide strength and rigidity |
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| Signal |
a
voltage produced by a sensor or some other component |
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| Simulate |
use
a computer to try something out before actually building it |
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| Single
Acting Cylinder |
a
pneumatic cylinder which uses air pressure to push a piston out and a
spring to return it |
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| Sketching |
drawing
freehand |
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| Sliding
Fit |
joining two parts together loosely so that they
can move independently of each other. You can use a sliding fit to join a wheel
to a fixed axle. |
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| SMA |
shape
memory alloy: a type of smart material which remembers its original shape
when heated with an electric current |
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| Smart
Materials |
new
materials with unusual characteristics and properties |
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| Snail
Cam |
a
snail shell shaped cam |
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| Soft
jaws |
plastic
jaws which fit in a vice to prevent damage to the object being held |
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| Softwood |
wood
from an evergreen tree which keeps it leaves in winter |
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| Solvents |
a
chemical which dissolves a material |
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| SPDT |
single
pole double throw |
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| Specialist |
an
expert in a specific area |
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| Specification |
a
detailed description of what the product has to do; look like; and be made
from |
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| Spreadsheet |
a
computer program that allows data to be manipulated |
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| Sprockets |
a thin wheel that has tiny teeth around its
edge, normally used with a chain to transmit rotary
motion, as on a bicycle. |
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| SPST |
single
pole single throw |
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| Stability |
resistance
to changes in shape or movement |
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| Stain
Resistance |
fabric
that is chemically protected against staining |
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| Star
Chart |
a visual representation of the attributes of a
product. It consists of several axes each representing a particular
attribute that can be given a score. Joining the score points often
creates a shape like a star, hence the name. |
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| Static
load |
a
constant applied force |
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| Stencil
Cutter |
a
CAM plotter which can cut thin plastic sheet or card |
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| Sterile |
a
complete absence of micro-organisms |
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| Stiffness |
a material property: A stiff material is
difficult to stretch or bend |
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| Stock
Sizes |
the
standard sizes of material stocked by suppliers |
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| Strength |
a
material property: a strong material can resist the forces of compression,
tension, torsion or shear
without breaking |
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| Stroke |
the
length of movement of a pneumatic cylinder |
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| Structure |
a framework or shell
that supports a load and/or encloses a space. |
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| Strut |
a
rigid structural member used to resist compressive
forces |
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| Survey |
an investigation used to elicit opinions. Surveys
usually rely on information from questionnaires. |
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| Switch |
a component
that controls the flow of electricity by either turning it on or off or by
changing the path along which it flows |
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| Symbols |
simplified
drawings used to represent things |
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| Synthetic |
a
manufactured material: not natural |
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System |
a group of components
which work together to make something happen |
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