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Arrangement of the physical elements to carry out its requiredfunction. Relationship among the component in the product and thefunction the product performs. For the example is defining thebuilding blocks of the product in term of what they do and interface.

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Power transmission machines use either chains,gears or belts. Usually, chain is an economicalpart of power transmission machines for low

speeds and large loads.

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From the table above it shown we choose the chain because it have more benefit thanother. Futhermore it suitable with our sprocket.Generally, under the same transmission conditions, the cost of toothed belts and pulleysis much higher than the cost of chains and sprockets.See the following features and points of notice about roller chain transmission.

Features of Chain Drives:Speed reduction/increase of up to seven to one can be easily accommodated.Chain can accommodate long shaft-center distances (less than 4 m), and is moreversatile.It is possible to use chain with multiple shafts or drives with both sides of the chain.Standardization of chains under the American National Standards Institute (ANSI), the

International Standardization Organization (ISO), and the Japanese Industrial Standards(JIS) allow ease of selection.It is easy to cut and connect chains.The sprocket diameter for a chain system may be smaller than a belt pulley, whiletransmitting the same torque.Sprockets are subject to less wear than gears because sprockets distribute the loadingover their many teeth.

Points of Notice:Chain has a speed variation, called chordal action, which is caused by the polygonaleffect of the sprockets.Chain needs lubrication.Chain wears and elongates.Chain is weak when subjected to loads from the side. It needs proper alignment.

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Sprocket are used in our project totransmit rotary motion between twoshafts where gears are unsuitable orto impart linear motion to a track.

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A pedal is the part of our project componentthat the user pushes with his or her foot topropel the gear and motor. It provides the

connection between the user's foot on shoeand the crank allowing the leg to turn thebottom bracket axle. Pedals usually consist ofa spindle that threads into the end of the crankand a body, on which the foot rests or isattached, that is free to rotate on bearings withrespect to the spindle.

http://en.wikipedia.org/wiki/Pedalhttp://en.wikipedia.org/wiki/Crankhttp://en.wikipedia.org/wiki/Axlehttp://en.wikipedia.org/wiki/Bearing_(mechanical)http://en.wikipedia.org/wiki/Bearing_(mechanical)http://en.wikipedia.org/wiki/Axlehttp://en.wikipedia.org/wiki/Crankhttp://en.wikipedia.org/wiki/Pedal

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Since we are not expert in electric, but we have doingresearch and surveying through internet and we foundthat below is the motor that commonly used togenerate electric.We chose a Permanent magnet DC motor for thefollowing reasons:1. Easy to control2. Ability to function as a generator and regeneratepower

3. Good torque-Speed relationships4. High-power weight ratio5. Past experience through Control Theory6. Ease of motor characterization (solving for torqueconstant, back-emf constant, voltage-speed constant)

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Given the time constraint and the complexity of theother system components, a permanent magnet motorwas ideal for our application. It would deliveradequate torque and rotate at a sufficient speed givenseveral levels of gear reduction to improve the existingsystem

Another factor leading to ourselecting a permanent magnet motorwas its relative low costs comparedto brushless motors, and the ease

with which it could be integratedinto the system.

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For our system we decided to purchase a 15-Amp-Hr battery. The costs does not increasedramatically as the Amp-Hr Capacity

increases, however, the size of the batteriesdoes. The B&B HR15-12 batteries would fit thescale of the system just as well as some of thesmaller capacity batteries, which is why weselected it over some of the higher capacitybatteries whose physical size increased beyondthe systems scale.

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Human factor is a term used to describe the abilities, limitations andother physiological or behavioral characteristics of human that effect thedesign and operation of tools, machine etc.

There are a few type of factor that we are consider in the our project:

Physical size limitationStatic human physical characteristicsHand and foot operated control devices

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Common condition environment posture measurements .

Example of result thatwe refer when designour product. Thatshown us the range ofhuman posturemeasurement.

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Assembly is the process of putting together all the products componentsbefore display.The individual components manufactured have to be assembled into aproduct. Assembly is an important phase of the overall manufacturingoperation and requires consideration of the ease, speed, and cost of

putting part together. Methodologies and computer software areavailable for DFA, utilizing 3-D conceptual design and solid models.Permanent-attachment methods include welding, brazing, soldering etc.Temporary-attachment methods include threaded fasteners such asscrews, nuts and bolts etc.

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FUNDAMENTAL:

The fusion of the joint between two part (melting and coalescingmaterial by means of heat) The consumable bare wire is fed automatically through a nozzle

into the weld arc by a wire-feed drive motor.

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This method is a comprehensive approach toproduction of goods and it integrates thedesign process with materials, manufacturing

method, process planning, assembly, testing,and quality assurance.

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This process are to produce the seat paddle in

our device. But we just get the already existingpart.That because it will take time to produce a newpart and required higher cost.

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Machining involves removing material from the workpiece by a sharpcutting tool that shears away chips of material to create a desired form orfeatures.Machining is a subtractive process that produces manufactured waste.There are a few machining process inlcude:

milling (involves removal of material from the flat surface by arotating cutter tool).

drilling (is removing material using a rotating bit to form a cylindricalform.

sawing (involves removing material with a toothed blade)

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Drilling is the process of using a drill to producecylindrical holes in solid materials, such as woodor metal. Different tools and methods are used for

drilling depending on the type of material, the sizeof the hole, the number of holes, and the time tocomplete the operationWe choose this method because we need to drill in

the internal frame to locate the shaft and to put thebolt and nut. This method is suitable to our processto produce the product and the machine we canuse in the our workshop.