 | Term | Definition |
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Technology |
The use of tool, materials, and knowledge to solve problems |
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Tool |
A device used to help solve a task |
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Material |
Something which is used to make something |
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Natural materials |
Materials that comb from nature |
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Synthetic materials |
Materials that are man made |
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Properties of metal |
Characteristics of a given metal |
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Weight |
How heavy a metal is |
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Strength |
How strong a metal is |
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Hardness |
Resistance to pressure (dents and holes) |
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Conductive |
Whether or not electricity can flow through it |
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Ductile |
Can the metal be stretched out or bent without breaking |
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Malleable |
Can the metal be shaped by hammering or rolling |
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Luster |
Is here a shine to the material |
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Cost |
How expensive a metal is |
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Mohs scale |
A scale of hardness of materials, the softest mineral is Talc, the hardest is Diamond |
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Rockwell scale |
A scale of the hardness of metals, usually steel |
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Ferrous metals |
Contain iron and are magnetic |
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Examples of ferrous metals |
Iron and steel (which is made from iron |
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Nonferrous metals |
Don’t contain iron and do not rust |
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Examples of nonferrous metals |
Aluminum, tin, copper, and lead |
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Metallurgy |
The science and technology of metals |
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Ore |
Rock like material which metal comes from (different metals come from different ores) |
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Blast furnace |
A large furnace which uses a blast of air to melt down ore |
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Rolling mill |
A large device in a factory which rolls metal into sheets and shapes |
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Element |
The smallest particle in nature, something which can not be broken downy any further |
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Alloy |
Two or more metals mixed together, generally done to make the metal stronger |
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Tarnishing |
When nonferrous metals darken and turn colors. Doesn’t weaken the metals. |
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Rusting |
A flaking process which can weaken ferrous metals. |
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Melting point |
The temperature on which metal melts |
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Examples of melting point |
Mercury- 72, Iron-2800, Silver-1700 |
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Three forms of metal |
Sheet metal, bar stock, and wire we use sheet metal and wire |
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Identifying metals |
Magnet test- if the magnet sticks then it is ferrous (stainless steel is not magnetic but it is ferrous) |
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Rockwell Hardness Tester |
Forces a diamond into metal and the results are read on a gauge |
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Mechanical fastening |
Usin bolts and screw to hold the metal together |
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Welding |
Welding is used for ferrous metals. It uses extremely high heat. Example would be electric arc welding or oxy-acetylene welding |
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Soldering |
Used for nonferrous metals |
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Soft soldering |
Low heat using a soldering iron and used for electrical work |
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Hard soldering (silver soldering) |
Hard soldering uses a blow torch and little piece of silver to form the bond |
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CAM |
Computer Aide Machining |
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How does CAM work |
It is when a machine is hooked up to, and run by, a computer. It can be used to cut shapes out of metal or engrave on metal quickly and accurately. |
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Machine used in class |
Vanguard Unica engraving machine |
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Program |
Adobe Illustrator |
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Precious metals in order |
Platinum, gold, and silver |
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Aluminum |
Al |
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Iron |
Fe |
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Copper |
Cu |
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Chrome |
Cr |
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Lead |
Pb used to be mixed in paints in the 1970s |
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Tin |
Sn |
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Brass |
Copper and zinc |
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Nickel silver |
Nickel, copper, and zinc |
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Steel |
Iron and carbon |
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Stainless steel |
Steel and chromium |
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Silicon carbide paper |
Black sand paper |
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Diagonal cutters |
Used to cut off messed up jump rings |
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Acetylene torch |
Blow torch |
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Burr |
Sharp edge caused in metal by drilling and filing |
