Tuesday, May 27, 2008
week 4 term 2
on tuesday we have done some more materials research and i completed my freehand design its been posted.today we are updating our blog and are posting pic
Tuesday, May 20, 2008
Aluminium
Aluminium Info
Background
http://www.azom.com/details.asp?ArticleID=2863
Background
Physically, chemically and mechanically aluminium is a metal like steel, brass, copper, zinc, lead or titanium. It can be melted, cast, formed and machined much like these metals and it conducts electric current. In fact often the same equipment and fabrication methods are used as for steel.
Light Weight
Aluminium is a very light metal with a specific weight of 2.7 g/cm3, about a third that of steel. For example, the use of aluminium in vehicles reduces dead-weight and energy consumption while increasing load capacity. Its strength can be adapted to the application required by modifying the composition of its alloys.
Corrosion Resistance
Aluminium naturally generates a protective oxide coating and is highly corrosion resistant. Different types of surface treatment such as anodising, painting or lacquering can further improve this property. It is particularly useful for applications where protection and conservation are required.
Electrical and Thermal Conductivity
Aluminium is an excellent heat and electricity conductor and in relation to its weight is almost twice as good a conductor as copper. This has made aluminium the most commonly used material in major power transmission lines.
Reflectivity
Aluminium is a good reflector of visible light as well as heat, and that together with its low weight, makes it an ideal material for reflectors in, for example, light fittings or rescue blankets.
Ductility
Aluminium is ductile and has a low melting point and density. In a molten condition it can be processed in a number of ways. Its ductility allows products of aluminium to be basically formed close to the end of the product’s design.
Impermeable and Odourless
Aluminium foil, even when it is rolled to only 0.007 mm thickness, is still completely impermeable and lets neither light aroma nor taste substances out. Moreover, the metal itself is non-toxic and releases no aroma or taste substances which makes it ideal for packaging sensitive products such as food or pharmaceuticals.
Recyclability
Aluminium is 100 percent recyclable with no downgrading of its qualities. The re-melting of aluminium requires little energy: only about 5 percent of the energy required to produce the primary metal initially is needed in the recycling process.
http://www.azom.com/details.asp?ArticleID=1446
Background
http://www.azom.com/details.asp?ArticleID=2863
Background
Physically, chemically and mechanically aluminium is a metal like steel, brass, copper, zinc, lead or titanium. It can be melted, cast, formed and machined much like these metals and it conducts electric current. In fact often the same equipment and fabrication methods are used as for steel.
Light Weight
Aluminium is a very light metal with a specific weight of 2.7 g/cm3, about a third that of steel. For example, the use of aluminium in vehicles reduces dead-weight and energy consumption while increasing load capacity. Its strength can be adapted to the application required by modifying the composition of its alloys.
Corrosion Resistance
Aluminium naturally generates a protective oxide coating and is highly corrosion resistant. Different types of surface treatment such as anodising, painting or lacquering can further improve this property. It is particularly useful for applications where protection and conservation are required.
Electrical and Thermal Conductivity
Aluminium is an excellent heat and electricity conductor and in relation to its weight is almost twice as good a conductor as copper. This has made aluminium the most commonly used material in major power transmission lines.
Reflectivity
Aluminium is a good reflector of visible light as well as heat, and that together with its low weight, makes it an ideal material for reflectors in, for example, light fittings or rescue blankets.
Ductility
Aluminium is ductile and has a low melting point and density. In a molten condition it can be processed in a number of ways. Its ductility allows products of aluminium to be basically formed close to the end of the product’s design.
Impermeable and Odourless
Aluminium foil, even when it is rolled to only 0.007 mm thickness, is still completely impermeable and lets neither light aroma nor taste substances out. Moreover, the metal itself is non-toxic and releases no aroma or taste substances which makes it ideal for packaging sensitive products such as food or pharmaceuticals.
Recyclability
Aluminium is 100 percent recyclable with no downgrading of its qualities. The re-melting of aluminium requires little energy: only about 5 percent of the energy required to produce the primary metal initially is needed in the recycling process.
http://www.azom.com/details.asp?ArticleID=1446
ABS
ABS - Acrylonitrile Butadiene Styrene Plastic
INTRODUCTION
ABS is an ideal material wherever superlative surface quality, colorfastness and luster are required. ABS is a two phase polymer blend. A continuous phase of styrene-acrylonitrile copolymer (SAN) gives the materials rigidity, hardness and heat resistance. The toughness of ABS is the result of submicroscopically fine polybutadiene rubber particles uniformly distributed in the SAN matrix.
GRADES AVAILABLE
ABS sandard grades have been developed specifically to meet the requirements of major customers. ABS is readily modified both by the addition of additives and by variation of the ratio of the three monomers Acrylonitrile, Butadiene and Styrene: hence grades available include high and medium impact, high heat resistance, and electroplatable. Fibre reinforcement can be incorporated to increase stiffness and dimensional stability. ABS is readily blended or alloyed with other polymers further increasing the range of properties available. Fire retardancy may be obtained either by the inclusion of fire retardant additives or by blending with PVC. The natural material is an opaque ivory colour and is readily coloured with pigments or dyes. Transparent grades are also available.
A variety of grades are available for different applications, the material is typically injection moulded or extruded.
PHYSICAL PROPERTIES
Tensile Strength 40-50
Notched Impact Strength 10 - 20
Thermal Coefficient of expansion 70 - 90
Max Cont Use Temp 80 - 95
Density 1.0 - 1.05 g/cm3
History of ABS
Styrene Acrylonitrile copolymers have been available since the 1940’s and while its increased toughness over styrene made it suitable for many applications, its limitations led to the introduction of a rubber (butadiene) as a third monomer and hence was born the range of materials popularly referred to as ABS plastics. These became available in the 1950’s and the variability of these copolymers and ease of processing has led to ABS becoming the most popular of the engineering polymers.
Terluran® is the ABS from BASF : special Terluran® grades and Terluran® Standard are ideal materials wherever superlative surface quality, colorfastness and luster are required. Terluran’s properties are superior to those generally expected from an ABS, even where comparable products require costly modification. Terluran® is an extremely cost-effective material for components with stringent service requirements, or where there is weight-saving potential.
http://www.bpf.co.uk/bpfindustry/plastics_materials_Acrylonitrile_Butadiene_Styrene_ABS.cfm
INTRODUCTION
ABS is an ideal material wherever superlative surface quality, colorfastness and luster are required. ABS is a two phase polymer blend. A continuous phase of styrene-acrylonitrile copolymer (SAN) gives the materials rigidity, hardness and heat resistance. The toughness of ABS is the result of submicroscopically fine polybutadiene rubber particles uniformly distributed in the SAN matrix.
GRADES AVAILABLE
ABS sandard grades have been developed specifically to meet the requirements of major customers. ABS is readily modified both by the addition of additives and by variation of the ratio of the three monomers Acrylonitrile, Butadiene and Styrene: hence grades available include high and medium impact, high heat resistance, and electroplatable. Fibre reinforcement can be incorporated to increase stiffness and dimensional stability. ABS is readily blended or alloyed with other polymers further increasing the range of properties available. Fire retardancy may be obtained either by the inclusion of fire retardant additives or by blending with PVC. The natural material is an opaque ivory colour and is readily coloured with pigments or dyes. Transparent grades are also available.
A variety of grades are available for different applications, the material is typically injection moulded or extruded.
PHYSICAL PROPERTIES
Tensile Strength 40-50
Notched Impact Strength 10 - 20
Thermal Coefficient of expansion 70 - 90
Max Cont Use Temp 80 - 95
Density 1.0 - 1.05 g/cm3
History of ABS
Styrene Acrylonitrile copolymers have been available since the 1940’s and while its increased toughness over styrene made it suitable for many applications, its limitations led to the introduction of a rubber (butadiene) as a third monomer and hence was born the range of materials popularly referred to as ABS plastics. These became available in the 1950’s and the variability of these copolymers and ease of processing has led to ABS becoming the most popular of the engineering polymers.
Terluran® is the ABS from BASF : special Terluran® grades and Terluran® Standard are ideal materials wherever superlative surface quality, colorfastness and luster are required. Terluran’s properties are superior to those generally expected from an ABS, even where comparable products require costly modification. Terluran® is an extremely cost-effective material for components with stringent service requirements, or where there is weight-saving potential.
http://www.bpf.co.uk/bpfindustry/plastics_materials_Acrylonitrile_Butadiene_Styrene_ABS.cfm
Acrylic
Advantages of Acrylic
Ease of FabricationWhen Acrylic is heated to its forming temperature (approximately 325ºF) it becomes soft and pliable and can be formed into a variety of shapes. As the material cools in its formed state, it solidifies and holds the shape to which it has been formed. Because the material is formed at low pressure, molds can be made from plastic and low-cost wood. Acrylic can also be machined, drilled and sawed like wood or soft metals.
Excellent Electrical PropertiesAcrylic has certain unmatched electrical properties which are affected slightly by weathering or moisture. Its surface resistivity is higher than most plastic materials and its power factor decreases with increased frequency.
LightweightAcrylic is less than 50% as heavy as glass, is 43% as heavy as aluminum and 70% as heavy as magnesium.
· Impact ResistantAlthough it weighs less than half as much as glass, Acrylic has from 6 to 17 times greater impact resistance than ordinary glass in thicknesses of .125" to .250"
· Weather ResistantAcrylic sheet withstands weather and sun exposure with almost no loss of light transmittance, clarity and strength in over a quarter century of usage.
Typical Properties
Dimensional stability
Impact resistant
Excellent fabrication characteristics
Lightweight
Excellent clarity
Tough and durable
Good U factor
Weather resistant
Heat resistant
Recommended Operating Limits
ASTM
UNITS
ACRYLIC
Mechanical
Tensile Strength Flexural StrengthModulus of ElasticityCompressive Strength @ YieldIzod Impact Strength (notch)Hardness Rockwell BarcolLight TransmissionSpecific GravityWater Absorption/Saturation
D638D790D790D695D256D785D2583D1003D792D570
psipsipsipsift•lbs/inM%1 = water%
10,00017,000480,00017,0000.49348921.190.2
Thermal
Heat Deflection Temperature Under Load, 264 psiThermal ExpansionFlammability/Burning Rating 0.125"Self Ignition Temperature
D648D696D635D1929
ºFin/inºFin/minºF
195.0000401.0830
Electrical
Dielectric Strength (short time) 0.125" Dielectric Constant 60 Hz 1000 HzDissipation Factor 60 Hz 1000 Hz
D149D150D150D150D150
V/mil
4303.63.30.060.04
http://www.alro.com/DIVplastics/plastic_product_acrylic.htm
Ease of FabricationWhen Acrylic is heated to its forming temperature (approximately 325ºF) it becomes soft and pliable and can be formed into a variety of shapes. As the material cools in its formed state, it solidifies and holds the shape to which it has been formed. Because the material is formed at low pressure, molds can be made from plastic and low-cost wood. Acrylic can also be machined, drilled and sawed like wood or soft metals.
Excellent Electrical PropertiesAcrylic has certain unmatched electrical properties which are affected slightly by weathering or moisture. Its surface resistivity is higher than most plastic materials and its power factor decreases with increased frequency.
LightweightAcrylic is less than 50% as heavy as glass, is 43% as heavy as aluminum and 70% as heavy as magnesium.
· Impact ResistantAlthough it weighs less than half as much as glass, Acrylic has from 6 to 17 times greater impact resistance than ordinary glass in thicknesses of .125" to .250"
· Weather ResistantAcrylic sheet withstands weather and sun exposure with almost no loss of light transmittance, clarity and strength in over a quarter century of usage.
Typical Properties
Dimensional stability
Impact resistant
Excellent fabrication characteristics
Lightweight
Excellent clarity
Tough and durable
Good U factor
Weather resistant
Heat resistant
Recommended Operating Limits
ASTM
UNITS
ACRYLIC
Mechanical
Tensile Strength Flexural StrengthModulus of ElasticityCompressive Strength @ YieldIzod Impact Strength (notch)Hardness Rockwell BarcolLight TransmissionSpecific GravityWater Absorption/Saturation
D638D790D790D695D256D785D2583D1003D792D570
psipsipsipsift•lbs/inM%1 = water%
10,00017,000480,00017,0000.49348921.190.2
Thermal
Heat Deflection Temperature Under Load, 264 psiThermal ExpansionFlammability/Burning Rating 0.125"Self Ignition Temperature
D648D696D635D1929
ºFin/inºFin/minºF
195.0000401.0830
Electrical
Dielectric Strength (short time) 0.125" Dielectric Constant 60 Hz 1000 HzDissipation Factor 60 Hz 1000 Hz
D149D150D150D150D150
V/mil
4303.63.30.060.04
http://www.alro.com/DIVplastics/plastic_product_acrylic.htm
week 3 term2 08
On Tuesday we did our materials research.I did ABS plastic Aluminium and Acrylic plastic . I have also done some stuff on my slim light design and have decided that it will be wall mounted because it will spead more light that way.Today we are updating blogger and our calender.On friday we are doing a 2 hour practical i will most likely be folding by box and making brackets for my aluminium box.
Thursday, May 15, 2008
constraints
CONSTAINTS How to solve this
Rust proof use rustproof materials eg. Alominiun Plastics etc.
weather proof Seal it so no water may get through Make it Sturdy
self powered Use Solar Panel
$60 Budget Buy components from Jay car and circuitronics
On at night off at day put in LDR
Rust proof use rustproof materials eg. Alominiun Plastics etc.
weather proof Seal it so no water may get through Make it Sturdy
self powered Use Solar Panel
$60 Budget Buy components from Jay car and circuitronics
On at night off at day put in LDR
Breif - Dr Tony House
Hi I am Dr Tony House Im your client i wants a self powered light that is outdoor in the corramandel beach.the purpose of the light is to light up poacita beach grass.the light must be able to withstand the corramandel weather so it must be rustproof and weather proof.it must turn off at day and automatically on at night.it must be under 500mm in size. It must be under $60.
Good Luck My Young Apprentice...
Good Luck My Young Apprentice...
Week 2 term 2 08 friday 11DTM
We have taken apart a a solar ligt tha t were from the warehouse . After we took the solar light apart we listed all the components that wer in it and wrote what material they were made of.We also listed what the components did. i finished that on wednesday.i also have helped some people that were a bit behind with there circuits.today we are doing blogging and next period we are most likely doing practical that will be great. :) =D
yesurrrrrrrrrr
yesurrrrrrrrrr
Thursday, May 8, 2008
Tuesday, May 6, 2008
week 1 term 2 08
we have just got back from holidays.Back to work we have just been updating our blogs so far this term.this friday we are going to do some practical.then on friday afternoon we are going o do some more concept designs on macromedia freehand MX
Yesurrrr
Yesurrrr
Monday, May 5, 2008
Week 11 Term 1 08
Today we are updating our blog.I have uploaded some pics of my working circuit.i have now got 3 working LEDs on it
yesurr
yesurr
Subscribe to:
Posts (Atom)