Tractor Design Rationale, Product Ecology: Difference between revisions
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'''Definition''': LifeTrac is a versatile, 4-wheel drive, full-sized, hydraulically-driven, skid-steering tractor of 18-200 hp with optional steel tracks. LifeTrac is intended to be a minimalist but high-performance, lifetime design, design-for-disassembly workhorse and power unit of any land stewardship operation. It features featuring easy serviceability by the user. Its modular nature allows for quick attachment of implements; interchangeability/stackability of multiple power units (Power Cubes) for adopting power level to the task at hand; quick attachment of all hydraulic components via quick-coupling hoses; including quick interchangeability of hydraulic motors for use in other applications. It can be fitted with up to two sets of loader arms. LifeTrac is intended to be used with modern steam engine Power Cube module for fuel flexibility, such that locally-harvested, pelletized biomass crop, such as hay, may be used for fuel. Regarding safety features, LifeTrac replaced the traditional power take-off (PTO) shaft for driving other implements with a detachable hydraulic motor for the same purpose, where this motor may be mounted on the tractor, on the implement, or wherever it is required. | '''Definition''': LifeTrac is a versatile, 4-wheel drive, full-sized, hydraulically-driven, skid-steering tractor of 18-200 hp with optional steel tracks. LifeTrac is intended to be a minimalist but high-performance, lifetime design, design-for-disassembly workhorse and power unit of any land stewardship operation. It features featuring easy serviceability by the user. Its modular nature allows for quick attachment of implements; interchangeability/stackability of multiple power units (Power Cubes) for adopting power level to the task at hand; quick attachment of all hydraulic components via quick-coupling hoses; including quick interchangeability of hydraulic motors for use in other applications. It can be fitted with up to two sets of loader arms. LifeTrac is intended to be used with modern steam engine Power Cube module for fuel flexibility, such that locally-harvested, pelletized biomass crop, such as hay, may be used for fuel. Regarding safety features, LifeTrac replaced the traditional power take-off (PTO) shaft for driving other implements with a detachable hydraulic motor for the same purpose, where this motor may be mounted on the tractor, on the implement, or wherever it is required. | ||
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'''Solution''' – LifeTrac is designed to be the peoples' tractor. The user is able to service, modify, and produce fuel for the tractor. Gear transmission is replaced with a hydraulic drive train, where quick-connect, flexible hoses are the means of transferring power. Lifetime design (bolt-together construction, modularity) with general purpose parts allows the tractor to be passed down from generation to generation, before its life-cycle is completed as feedstock for the induction furnace. The absolute simplest design facilitates creation of small-scale enterprise for manufacturing these tractors in as little as 3 days of time using a RepLab1 facility. This allows communities to be entirely self-sufficient in their mechanical power infrastructures, while reducing lifetime costs of tractors by a factor of at least 10. | '''Solution''' – LifeTrac is designed to be the peoples' tractor. The user is able to service, modify, and produce fuel for the tractor. Gear transmission is replaced with a hydraulic drive train, where quick-connect, flexible hoses are the means of transferring power. Lifetime design (bolt-together construction, modularity) with general purpose parts allows the tractor to be passed down from generation to generation, before its life-cycle is completed as feedstock for the induction furnace. The absolute simplest design facilitates creation of small-scale enterprise for manufacturing these tractors in as little as 3 days of time using a RepLab1 facility. This allows communities to be entirely self-sufficient in their mechanical power infrastructures, while reducing lifetime costs of tractors by a factor of at least 10. | ||
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Development Status and Needs''' – We have completed Prototype I-III, and we are currently on Prototype IV. Prototype I (ref) was an articulated version of the tractor without roll cage, and Prototype II (ref) was an enclosed version with tracks and skid steering. Prototype II has demonstrated quick-attachment and stackability of power units (ref), as well as interchangeability of wheel motors and control valves via quick-couplers for repurposing in other applications. Prototype III was a shortened version of Prototype II with only one set f loader arms, and it featured CNC Torch Table assist in its fabrication. Prototype IV (Current as of Dec. 2011) introduces [[Quick Connect Wheels]]. Moreover, minor redesign of LifeTrac | '''Development Status and Needs''' – We have completed Prototype I-III, and we are currently on Prototype IV. Prototype I (ref) was an articulated version of the tractor without roll cage, and Prototype II (ref) was an enclosed version with tracks and skid steering. Prototype II has demonstrated quick-attachment and stackability of power units (ref), as well as interchangeability of wheel motors and control valves via quick-couplers for repurposing in other applications. Prototype III was a shortened version of Prototype II with only one set f loader arms, and it featured CNC Torch Table assist in its fabrication. Prototype IV (Current as of Dec. 2011) introduces [[Quick Connect Wheels]]. Moreover, minor redesign (thicker wheel shafts and bearings (2.5") of LifeTrac lend themselves to adaptation as a tracked bulldozer – via addition of chain gear reduction to the direct-coupled wheel drive. | ||
Development Brief for LifeTrac Digital Fabrication - Download the LifeTrac Blender file. Then import it into a professional CAD package like Solidworks to generate 2D fabrication drawings, and further, these drawings have to be converted to toolpath (xy) files for a torch table. | Development Brief for LifeTrac Digital Fabrication - Download the LifeTrac Blender file. Then import it into a professional CAD package like Solidworks to generate 2D fabrication drawings, and further, these drawings have to be converted to toolpath (xy) files for a torch table. |
Revision as of 07:53, 28 December 2011
Definition: LifeTrac is a versatile, 4-wheel drive, full-sized, hydraulically-driven, skid-steering tractor of 18-200 hp with optional steel tracks. LifeTrac is intended to be a minimalist but high-performance, lifetime design, design-for-disassembly workhorse and power unit of any land stewardship operation. It features featuring easy serviceability by the user. Its modular nature allows for quick attachment of implements; interchangeability/stackability of multiple power units (Power Cubes) for adopting power level to the task at hand; quick attachment of all hydraulic components via quick-coupling hoses; including quick interchangeability of hydraulic motors for use in other applications. It can be fitted with up to two sets of loader arms. LifeTrac is intended to be used with modern steam engine Power Cube module for fuel flexibility, such that locally-harvested, pelletized biomass crop, such as hay, may be used for fuel. Regarding safety features, LifeTrac replaced the traditional power take-off (PTO) shaft for driving other implements with a detachable hydraulic motor for the same purpose, where this motor may be mounted on the tractor, on the implement, or wherever it is required.
Problem Statement – Industrial tractors are being designed increasingly for planned obsolescence with 10 year lifespans, and the user typically cannot service their own tractor due to complexity of design. Power transmission and engine systems are the dominant failure modes of tractors. Fuel costs are a significant expense of operating a tractor. Capital costs of purchasing tractors typically place their users in debt.
Solution – LifeTrac is designed to be the peoples' tractor. The user is able to service, modify, and produce fuel for the tractor. Gear transmission is replaced with a hydraulic drive train, where quick-connect, flexible hoses are the means of transferring power. Lifetime design (bolt-together construction, modularity) with general purpose parts allows the tractor to be passed down from generation to generation, before its life-cycle is completed as feedstock for the induction furnace. The absolute simplest design facilitates creation of small-scale enterprise for manufacturing these tractors in as little as 3 days of time using a RepLab1 facility. This allows communities to be entirely self-sufficient in their mechanical power infrastructures, while reducing lifetime costs of tractors by a factor of at least 10.
Development Status and Needs – We have completed Prototype I-III, and we are currently on Prototype IV. Prototype I (ref) was an articulated version of the tractor without roll cage, and Prototype II (ref) was an enclosed version with tracks and skid steering. Prototype II has demonstrated quick-attachment and stackability of power units (ref), as well as interchangeability of wheel motors and control valves via quick-couplers for repurposing in other applications. Prototype III was a shortened version of Prototype II with only one set f loader arms, and it featured CNC Torch Table assist in its fabrication. Prototype IV (Current as of Dec. 2011) introduces Quick Connect Wheels. Moreover, minor redesign (thicker wheel shafts and bearings (2.5") of LifeTrac lend themselves to adaptation as a tracked bulldozer – via addition of chain gear reduction to the direct-coupled wheel drive.
Development Brief for LifeTrac Digital Fabrication - Download the LifeTrac Blender file. Then import it into a professional CAD package like Solidworks to generate 2D fabrication drawings, and further, these drawings have to be converted to toolpath (xy) files for a torch table.
The problem requires virtual dismounting the tractor into all of its structural tubing and plates - the components that we will be cut with the torch table. The tubing is 4x4x1/4" mild steel tubing, and the plates are 1/2" mild steel plate plate steel.
The final step is optimizing the cutting strategy based on available stock steel that can fit on a torch table. For example, we can start with a sheet of 1/2" thick steel, not individual plates, for producing all the mounting plates.
Product Ecology
From | Uses | Creates | Enables |
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