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REQUIREMENTDETAILS
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Performance Specifications
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power, size, weight, speed, torque, force, hydraulic flow, lift, precision, cost, etc.
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expected lifetime, operating and maintenance costs, production/throughput rate
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Module-Specific Requirements
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Determine how machine is broken into moduleswrite down a list of modules and their explanations.
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Describe each module.
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Interface Requirements
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list known design features of the interface between modulesInclude concept diagrams of geometry, any known technical design of geometry; qualitative features of interface
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list know design features of interface to other machines in GVCS Product Ecology
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Design Choices
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list choices of components or design approaches selected from Tech Tree of Choices
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Fabrication Requirements
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Admissible tools, materials, techniques used. Design for disassembly and repair: easy to service, access parts. No unreachable or untightenable fasteners. Transparent design that makes fabrication process as transparent as possible.
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OSE Specifications
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Module-Based DesignMachine must be broken into modules and interfaces between these modules must be defined. When requesting design work, OSE requires a level of modularity that facilitates easy builds and reuse of modules in different products.
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CompatibilityMust be compatible with these other machines, components, or systems: (list)
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Product Ecology DesignDesigned as a Product Ecology - at the component, module, and machine level. This means any single machine is being design with consideration of fitting in the overall set, not as a single machine. This means that the specific machine can be used with components from every other machine and that it can be scaled in a relatively unlimited way. The intent here is that we are testing the feasibility of the entire package being managed (capable of being built from scrap steel in 50 days with 4 skilled people and 12 apprentices and repaired/maintained as the entire set at no more than 400 hours per year).
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Low cost. Common, off-shelf parts. Minimum machining. Capable of using low cost feedstocks.
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Lifetime Design. Achieved by: bolt-together, Space Frame construction; modularity - allows new functions to come from machine, extending range of service; simplicity, transparency, and serviceability - user is in control and user can take responsibility for maintaining the machine in good shape; scalability - allows machine to grow/shrink with needs.
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Design for Scalability. Intensive and Extensive Scalability. Includes stackability via easy interface design. Machines should be designed to allow infinite scalability. Ex. Power cube can be built using the same structural frame in sizes from 5 hp to 200 hp, and these can be stacked in parallel or siries.
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Modular Design. Involves clear interface design. Quick-coupled hydraulics and bolt-together space frames facilitate this. Modularity can occur on the component level as well, with the Stock Tubing and Stock Pivot Plates. Same PTO motor drives Open Source Car and agricultural implements.
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Design for Fabrication. Design for minimal fabrication requirements. Design for common parts. Design for production of multiple, stock, identical components - like Legos and erector set.
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Simplicity. Minimal parts count. Maximum redundancy of part types.
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High Performance. Meeting or exceeding industry standards - as defined in GVCS Comparison to Industry Standards. Overbuild with Space Frames. Match production rates of industry standards.
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Efficiency. OSE efficiency is measured on global performance (based on regenerative economic development as the goal) as opposed to point performance
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Time of ProductionDesign for Fabrication should maximize module-based design to enable one day, rapid production in the Collaborative Production Model
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