Showing posts with label Robotics Hand. Show all posts
Showing posts with label Robotics Hand. Show all posts

Thursday, March 24, 2011

Adaptive Gripper



The robotic gripper that adapts to all parts, simply.

Robotiq is developed by Quebec company. Robotiq is very interesting robotic gripper that can adapt to various types of objects. 

How it works

    • 3 articulated fingers and 4 grasping modes to pick a wide variety of sizes and shapes.
    • Send simple open-close commands and let the gripper adapts to any geometry.
    • Control the closing speed, force, do partial closing / opening.
    • Receive grip detection feedback from the gripper.
    • Embedded gripper controller communicating with the robot controller over Ethernet/IP, Modbus RTU, DeviceNet or EtherCAT. Program from the teach pendant.
    • Electric gripper, comes with the mechanical mount for your robot. Has two connectors on the side for 24V power supply and communication.

    Monday, February 21, 2011

    Super Robust Anthropomorphic Robot Hand


    German researchers may have an anthropomorphic robot handthat a collision with hard objects, and even the strike, without breaking into pieces survive Hammer built.
    In designing the new site, a researcher at the Institute of Roboticsand Mechatronics, German Aerospace Center, part of the (DLR),focused on resilience. You may only have built a robot hand of themost difficult yet.
    DLR hand has articulated a shape and size of the human hand withfive fingers through a network of 38 tendons each with a singleengine supports the forearm.
    The main features of the DLR from the hand of the other robot cancontrol it its rigidity. The engine can strain the tendon, which thehand can to absorb the shock of the violence. In one study, theresearcher's hand collided with a baseball bat the effects of the66th G Good hands.

    Thursday, June 11, 2009

    Robot Hand Powered by Rocket

    The new rocket-powered robotic arm, shown in this diagram, is stronger and faster than the ones on the market. Here's how it works: The propellant cartridge contains pressurized liquid hydrogen peroxide, which is routed through two flexible lines (not shown) across the elbow joint and into two catalyst packs. The catalyst burns the hydrogen peroxide, generating steam that pushes pistons up and down — allowing the arm to move.

    Michael Goldfarb, a professor at Vanderbilt University, has led the development of a prosthetic arm that, get this, is powered by miniature rocket motor systems! The fuel, hydrogen peroxide, is burnt in a catalytic reaction generating steam that opens and closes valves connected to the joints of the arm. The mechanical parts that make up the arm were precision machined to avoid any leaks. A small canister of hydrogen peroxide loaded into the arm provides sufficient energy to allow 18 hours of normal arm movement! At 450°F (232°C) one would think the super-heated steam would cause a tincy mincy discomfort to the user. Fortunately, the researchers thought of end-user comfort and insulated the really (really) hot parts of the arm. Look at the video.. the motion is quite amazing. The thumb and fingers are controlled independently. It probably sounds really cool too!

    "Our design does not have superhuman strength or capability, but it is closer in terms of function and power to a human arm than any previous prosthetic device that is self-powered and weighs about the same as a natural arm," said researcher Michael Goldfarb, a roboticist at Vanderbilt University in Nashville.
    Conventional prosthetic arms do not have the strength of their flesh-and-blood counterparts, the reason being the batteries. In order to lift comparable weights, a prosthetic arm would need a massive battery, too large for the prosthesis itself. So (project leader) Michael Goldfarb started thinking about other ways to power the artificial limbs, and came up with the idea of using the monopropellant rocket motor system that the space shuttle uses to maneuver in space.

    The researchers say their fuel system is superior to the traditional method of powering prostheses, batteries. Batteries are heavy relative to the power they produce; the rocket-powered arm, says Michael Goldfarb, the professor who led the team, produces more power with less weight than limbs that use other power sources.

    The prototype also produces more natural movement that conventional prosthetic arms. Instead of two joints -- typical arms only move at the elbow and at the "claw" -- the new device has fingers that can open and close independently of each other, and a wrist that twists and bends.

    The Vanderbilt engineers are competing with teams at several other universities and corporations in a program that the Defense Advanced Research Project Agency calls "Revolutionizing Prosthetics 2009," an effort to build an advanced bionic arm to help soldiers who've been injured at war perform the sort of daily tasks most of take for granted.


    Thursday, June 4, 2009

    Flexible Joint Robot Finger


    An exploration into the practicality of a flexible jointed, as opposed to traditional hinge jointed, finger for robotics and prosthetics applications.

    Design emphasis: durability and safety in real world interactions

    It is a hard truth of robot arm design that as one works outward from the torso to the fingertips, parts become smaller, more numerous, and more delicate. This is why robot hands have tended to be delicate and expensive.
    Yet it is this most delicate part of the robot - the hand - that must physically interact with the real world. And these interactions, bumpy in the best of times, can be violent during the long process of software development. A bad line of software can crash a hand, resulting in major repair costs and delays.

    Clearly, for AI software development in the area of manipulation to proceed apace, as well as for robotic and prosthetic hand usage in gereral, a robustness-centric approach to hands and fingers is key.
    One approach to achieve robustness is structural compliance (e.g. a finger with rubber parts that give). Another is high strength (e.g. titanium hinge joints). How these various approaches perform in the harsh test of reality can only be known by building and testing.

    Novel fabrication techniques were a big part of this project, which is more akin to SDM (shape deposition manufacturing) than traditional methods.
    Various molding and casting operations, as well as some machining, were involved in the fabrication of these fingers.
    To the right is shown an early silicone finger mold being made around a delrin and teflon tube pattern.
    There's a big difference between a nice design and a nice design that lasts.
    Repetitive and overstress testing are essential when dealing with novel material arrangements like these - there are no roadmaps. Realistic tests quickly illuminate misconceptions, strengths and weaknesses in a design, and form the basis for design evolution.
    A 2 axis tendon pulling machine with counters was built which allowed unattended repetitive tests of tendons, joints and whole fingers. Various loads and ranges of motion could be tried. 100K reps was deemed an acceptable longevity.
    Central to this design is the cable-reinforced urethane bender, 3 different types of which form the "hinge joints" of a finger. Cast-in tunnels for wiring run down the center, and the dual "X" cables provide torsional rigidity. Physical keying and cable stubs keep the benders in place within epoxy "bones".
    Urethane thermoset elastomers such as this are very rugged, with excellent tear and abrasion resistance.
    The downside to any rubber joint strategy, however, is the force required to bend it. These rubbers also do not immediately return all the way.

    Specifications:

    Research and Development by Carl Pisaturo
    in association with Jeff Weber, MIT Media Lab

    Aprox. Human Size: 5" long x .75" high x .6" wide
    Urethane Rubber, Stainless Steel Cable, Epoxy, Delin rollers, Teflon Tubing.
    About Human Size
    3 Degrees of Freedom
    1 or 2 Actuators
    Reasonable Grasp Strength
    Excellent Abuse Tolerance
    Excellent Longevity
    Reasonable Torsional Rigidity
    Wiring Tunnels to Each Segment
    Lightweight - 35 grams



    Click thumbnail for large size

    Sunday, May 31, 2009

    Lending a helping hand

    When she was on the Cal Tennis Club, Yoko “Yoky” Matsuoka (B.S.’93 EECS) dreamed of creating a robotic opponent that could return balls to her over the net. That bot never materialized, but her desire to build it launched a groundbreaking career that earned her a 2007 MacArthur “genius” award, a no-strings-attached, $500,000 honor from the John D. and Catherine T. MacArthur Foundation recognizing Matsuoka’s bold research in neurobotics—neuroscience meets robotics—most notably her efforts in developing a brain-powered prosthetic hand.

    A native of Japan, Matsuoka grew up in Santa Barbara, California. After graduating from Berkeley, she earned her master’s and doctorate at MIT, then joined the faculty at Carnegie Mellon. In 2006, she joined the University of Washington, where she is now associate professor of computer science and engineering and on the research team at UW’s Neurobotics Lab.


    “Moving forward 25 to 30 years, we have to achieve very dexterous behavior,” Matsuoka says. Current prosthetic options are stiff and provide only limited motion. But her approach could give amputees the ability to operate a replacement limb without, well, giving it a second thought.

    Matsuoka and team modeled a robotic prosthesis on an actual human appendage and wired it to function like the real thing. The device incorporates lifelike “bones” made from composite that articulate when mini-motors drive nylon polymer “tendons” to curl or flex a finger. In place of the brain signals that control movement in a normal hand, this creation uses neural data from real patients, transformed by algorithms into pulses that drive the motors. Matsuoka hopes that one day, an amputee will be able to attach the limb and operate it just as they would a biological one—with brain power.

    “Assume you’re missing your arm, and we give you a complex robotic prosthesis that has nothing to do with how your brain actually controls your arm,” she says. “If we can provide a system that looks and functions like a real system, your brain doesn’t have to work as hard to control it.”

    Matsuoka also built a robotic arm that safely guides individuals recovering from strokes and other neurological problems through their physical therapy regimes. With her newfound MacArthur funding, she has visions of starting a company, “writing a book or three” and working with K–12 institutions, all with the goal of speeding up the timetable for bringing neurobotic technology into our daily lives.

    Great job! Original Article from here

    Saturday, May 30, 2009

    Dexterous Robotic Hand Operated by Compressed Air

    The innovative Robotic Air Powered Hand with Elastic Ligaments (RAPHaEL), developed by Virginia Tech’s Robotics and Mechanisms Laboratory of the College of Engineering came in first place in the recent 2008-2009 Compressed Air and Gas Institute’s Innovation Award Contest.

    The Robotics and Mechanisms Laboratory (RoMeLa) of the College of Engineering at Virginia Tech has developed a unique robotic hand that can firmly hold objects as heavy as a can of food or as delicate as a raw egg, while dexterous enough to gesture for sign language.
    Named RAPHaEL (Robotic Air Powered Hand with Elastic Ligaments), the fully articulated robotic hand is powered by a compressor air tank at 60 psi and a novel accordion type tube actuator. Microcontroller commands operate the movement to coordinate the motion of the fingers.

    “This air-powered design is what makes the hand unique, as it does not require the use of any motors or other actuators, the grasping force and compliance can be easily adjusted by simply changing the air pressure,” said Dennis Hong, RoMeLa (http://www.me.vt.edu/romela/) director and the faculty adviser on the project. RoMeLa is part of Virginia Tech’s department of mechanical engineering (ME).
    The grip derives from the extent of pressure of the air. A low pressure is used for a lighter grip, while a higher pressure allows for a sturdier grip. The compliance of compressed air also aids in the grasping as the fingers can naturally follow the contour of the grasped object.

    “There would be great market potential for this hand, such as for robotic prosthetics, due to the previously described benefits, as well as low cost, safety and simplicity,” Hong said. The concept has won RoMeLa first place in the recent 2008-2009 Compressed Air and Gas Institute (http://www.cagi.org) (CAGI)’s Innovation Award Contest, with team members sharing $2,500 and the College of Engineering receiving a separate $8,000 monetary award.

    The $10,500 prize was announced in April by the Cleveland, Ohio-based CAGI, an industry organization. The design competition was an invitation-only program, with projects overviews – including written reports and video – being sent to the judging panel. Teams from Virginia Tech, the Milwaukee School of Engineering and Buffalo State College each submitted entries on their air-powered designs for judging. Six teams in all participated, according to Hong.

    It is the second year in a row that RoMeLa has won first place in the CAGI competition. A judge on the panel said of the robotic hand, “It is a cutting edge concept, and the engineering was no less than brilliant.”
    Student team members, all ME majors, are:

  • Colin Smith of Reston, Va., a senior.
  • Kyle Cothern of Fredericksburg, Va., a junior.
  • Carlos Guevara of El Salvador, a senior.
  • Alexander McCraw of York, Pa., a senior.
  • Friday, May 29, 2009

    DexHand ( Dextrous Hand )

    Dextrous Robotic Hand is a Robotic Hand with Five Fingers and has 11 DOF. Driven by RC standard servos. Dextrous Robotic Hand controlled by potentiometers as sensor equipped Master Glove to indicate the user's fingers positions. A large variety of different objects can be grasped reliably and the movements of the hand appear to be very natural like human hand movements.

    Each finger have 2 DOF that is MP (Metacarpal Phalangeal) joint and PIP (Proximal Inter Phalangeal)joint. The DIP (Distal Inter Phalangeal) joint is passively driven follow PIP joint.
    The method of control is use a power glove outfitted with potentiometers as sensor across the dorsal surface of the fingers and thumb.

    Read more here