Notas sobre diy
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Water Filtration Using Plant Xylem
"Effective point-of-use devices for providing safe drinking water are urgently needed to reduce the global burden of waterborne disease. Here we show that plant xylem from the sapwood of coniferous trees – a readily available, inexpensive, biodegradable, and disposable material – can remove bacteria from water by simple pressure-driven filtration. Approximately 3 cm3 of sapwood can filter water at the rate of several liters per day, sufficient to meet the clean drinking water needs of one person. The results demonstrate the potential of plant xylem to address the need for pathogen-free drinking water in developing countries and resource-limited settings."
Power Controlling Cheap Car Winches for a Large Scale 3D Concrete Printer
"A while back we wanted to experiment with 3D printing in concrete. So we built a cartesian large format structure with off-the-shelf aluminium truss, self-designed carriages running on rollerskate wheels and stepper-motor controlled steel wire driven axises."
Turning Wood Into Plastic
Renewable and biodegradable materials]] derived from biomass are attractive candidates to replace non-biodegradable petrochemical plastics. However, the mechanical performance and wet stability of biomass are generally insufficient for practical applications. Herein, we report a facile in situ lignin regeneration strategy to synthesize a high-performance bioplastic from lignocellulosic resources (for example, wood). In this process, the porous matrix of natural wood is deconstructed to form a homogeneous cellulose–lignin slurry that features nanoscale entanglement and hydrogen bonding between the regenerated lignin and cellulose micro/nanofibrils. The resulting lignocellulosic bioplastic shows high mechanical strength, excellent water stability, ultraviolet-light resistance and improved thermal stability. Furthermore, the lignocellulosic bioplastic has a lower environmental impact as it can be easily recycled or safely biodegraded in the natural environment. This in situ lignin regeneration strategy involving only green and recyclable chemicals provides a promising route to producing strong, biodegradable and sustainable lignocellulosic bioplastic as a promising alternative to petrochemical plastics.
RUC: Robot arm
"We have made a super cheap (less than 1000 dollars) industrial robot arm to enable students to hack larger scale robotics and to enable small local productions to use robots in their processes without breaking the bank. It is a product of a 3 day sprint."
Curso para construção de robots
Recomendo vivamente este curso online
- Lecture 1 - Course Overview and an Introduction to Ball Bearings
- Lecture 2 - Finishing Discussion of Ball Bearings and Introducing Gears
- Lecture 3 - Holes, Screws, and How to Make Precise Stacks of Planar Parts
- Lecture 5 - Belts
- Lecture 6 - Friction Drives, Differentials, and Flexures (Living-Hinges)
- Lecture 7 - Introduction to Cable Transmissions
- Lecture 8 - Push-Pull Cable/Sheath, Universal Joints, and Flexible Shafts
- Lecture 9 - Slip-Rings and Encoders
- Lecture 10 - Encoders, Connecting a Robot to the Computer, DC Motors
- Lecture 11 - Completing Our Discussion of DC Motors
- Lecture 12 - How to Use Precise Measuring Tools
- Lecture 13 - Rigid Linkages, Spherical Bearings, Remote-Center-of-Motion, and Counterbalances
- Lecture 14 - Servo Motors, 80-20 Aluminum Framing, and How to Design Your Robot Base/Table
- Lecture 15 - Discussing Springs and Introducing the Final Project
- Lecture 16 - Final Project, an Inexpensive Motor Controller, and an Inexpensive Linear Slide
- Lecture 17 - Linear Motion/Prismatic Joints
- Lecture 18 - Cams, Wheels, Omni-Wheels, Casters, and Special Motors
- Lecture 19 - Review of Ball Bearings, Different Kinds of Ball Bearings, Exit Questionnaire
A compliant mechanism is a mechanism that gains at least some of its mobility from the deflection of flexible members rather than from movable joints only. An example or a compliant crimping mechanism is shown below.
Flexures: BYU Compliant Mechanisms
The BYU Compliant Mechanisms Research Group (CMR) involves students and faculty who strive to make an impact by creating compliant mechanism theories and applications that are novel, used by others, and make a difference for good.
Elowan: A plant-robot hybrid
Elowan is a cybernetic lifeform, a plant in direct dialogue with a machine. Using its own internal electrical signals, the plant is interfaced with a robotic extension that drives it toward light.
Mechanisms having motion with constrained degrees of freedom
One or more flexures, each having compliant support structures with folded beams, provide a coupling having three degrees of freedom, two couplings having five degrees of freedom, a motion stage having five degrees of freedom, and a motion stage having one degree of freedom.
Multi-rotor wind turbine
Multiple horizontal axis type rotors are coaxially attached along the upper section of an elongate torque transmitting tower/driveshaft.
Última actualização/Last updated: 08-05-2021 [09:16]
(c) Tiago Charters de Azevedo