Mechanical arm

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A mechanical arm is a machine that usually mimics the action of a human arm. Mechanical arms are composed of multiple beams connected by hinges powered by actuators. One end of the arm is attached to a firm base while the other has a tool. They can be controlled by humans either directly or over a distance. A computer-controlled mechanical arm is called a robotic arm. However, a robotic arm is just one of many types of different mechanical arms. [1]

Contents

Mechanical arms can be as simple as tweezers or as complex as prosthetic arms. In other words, if a mechanism can grab an object, hold an object, and transfer an object just like a human arm, it can be classified as a mechanical arm. [2]

Recent advancements have been brought about to lead future improvements in the medical field with prosthetics and with the mechanical arm in general. When mechanical engineers build complex mechanical arms, the goal is for the arm to perform a task that ordinary human arms can not complete. [2]

Ambroise Pare: prosthetics, mechanical arm (Published: 1564) Ambroise Pare; prosthetics, mechanical arm Wellcome L0043497.jpg
Ambroise Pare: prosthetics, mechanical arm (Published: 1564)

History

Robotic Arms

Researchers have classified the robotic arm by its industrial applications, medical applications, and technology, etc. It was first introduced in the late 1930s by William Pollard and Harold A. Roseland, where they developed a "sprayer" that had about five degrees of freedom and an electric control system. Pollard's was called “first position controlling apparatus.” William Pollard never designed or built his arm, but it was a base for other inventors in the future. [3]

In 1961 the Unimate was invented, evolving to the PUMA arm. In 1963, the Rancho arm was designed, along with many others in the future. Even though Joseph Engelberger marketed Unimate, George Devol invented the robotic arm. It focused on using Unimate for tasks harmful to humans. In 1959, a 2700-pound Unimate prototype was installed at the General Motors die-casting plant in Trenton, New Jersey. The Unimate 1900 series became the very first produced robotic arm for die-casting. During a very short period of time, had been produced at least 450 robotic arms which were being used. It still remains one of the most significant contributions in the last one hundred years. As years went by, technology evolved, helping to build better robotic arms. Not only did companies invent different robotic arms, but so did colleges. In 1969, Victor Scheinman from Stanford University invented the Stanford arm, where it had electronically powered arms that could move through six axes. Marvin Minsky, from MIT, built a robotic arm for the office of Naval Research, possibly for underwater explorations. This arm had twelve single degree freedom joints in this electric- hydraulic- high dexterity arm. Robots were initially created to perform a series of tasks that humans found boring, harmful, and tedious. [3] [4] [5]

Prosthetics

Before the Modern Era

Replica of a prosthetic arm. The original probably dates from between 1550 and 1600. ElizabethanProstheticArm Replica.jpg
Replica of a prosthetic arm. The original probably dates from between 1550 and 1600.

The history of prosthetic limbs came to be by such great inventors. The world's first and earliest functioning prosthetic body parts are two toes from Ancient Egypt. Because of their unique functionality, these toes are an example of a true prosthetic device. These toes carry at least forty percent of the body's weight. Most prosthetic limbs would be produced after there is intensive studying of a human being's form by using modern equipment. Prosthetic limbs were used during the war too, including during the late 1480s. A German knight, who served with the Holy Roman Emperor Charles V, was injured during the war. Even though prosthetic limbs were expensive, this particular limb was manufactured by an armor specialist. Soldiers were allowed to continue their career because of prosthetics. The fingers could grasp a shield, hold reins to horses, and even a quill when drafting an important document. [6]

Modern Era

Artificial left arm, London, England Wellcome. Artificial left arm, London, England Wellcome L0058822.jpg
Artificial left arm, London, England Wellcome.

As time passed, limb design started to focus on people's specialties as well. For example, a pianist would need a different type of mechanical arm than others. Their limbs would be widespread and their middle and ring fingers would be smaller than normal. In addition, an arm design of padded tips on the thumb and little finger would allow a pianist to span a series of notes while playing their instrument. [6]

Technology for the prosthetic limbs kept evolving after World War I. After the war, laborers would return to work, using either legs or the arms because of its ability to grip objects. This is one of the designs that remains unchanged over the past century. People with such prosthetics would do everyday things like driving a car, eating food, and much more. [6]

Arms for Automotive Manufacturing

6 Axis Articulated Robots Industrial robots-transparent.gif
6 Axis Articulated Robots

Without the mechanical arm, the production of cars would be extremely difficult. This problem was first solved in 1962 when the first mechanical arm was used in a “General Motors” factory. Using this mechanical arm, also known as an industrial robot, engineers were able to achieve difficult welding tasks. In addition, the removal of die-castings was another important step in improving the abilities of a mechanical arm. With such technology, engineers were able to easily remove unneeded metal underneath mold cavities. Stemming off these uses, welding started to become increasingly popular for mechanical arms. [5]

In 1979, the company Nachi refined the first motor-driven robot to perform spot welding. Spot welding is a very important process used in the creation of cars to join separate surfaces together. Soon enough, mechanical arms were being passed down to additional car companies. [7]

As constant improvements were being made, the National University of Singapore (NUS) decided to make even further advancements by inventing a mechanical arm that can lift up to 80 times its original weight. Not only did this arm expand its lift strength, but the arm could also extend to five times its original length. These advancements were first introduced in 2012 and car companies can greatly benefit from this new scientific knowledge. [7]

Surgical Arms

Laproscopic Surgery Robot (2006) Laproscopic Surgery Robot.jpg
Laproscopic Surgery Robot (2006)

Surgical arms were first used in 1985 when a neurosurgical biopsy was performed. In 1990, the FDA allowed endoscopic surgical procedures to be done by the Automated Educational Substitute Operator (AESOP) system. This was not the only improvement the FDA made, however. While the AESOP system was more of a Computer Motion system, the first surgery system came about in 2000, when the da Vinci Surgical System became the first robotic surgery system approved by the FDA.

Types

Prosthetic arms

Prosthetics may not seem like a mechanical arm, but they are. It uses hinges and a wire harness to allow an incapable being to perform everyday functions. They have started creating arms that take a structure of a human arm and even though it looks like a skeletal metal arm, it moves like a normal arm and hand. This arm was made by Johns Hopkins University in 2015. It has 26 joints (way more than the old outdated arms) and is capable of lifting up to 45 pounds. This arm has 100 sensors that connect to the human mind. These sensors allow the person with the arm to move the arm like it was just another part of his or her body. People who have used this new prosthetic can say that they have actually been able to feel the texture, ultimately making prosthetics a huge part of the mechanical arm category. [7]

Rover arms

Three generations of Mars rovers PIA15279 3rovers-stand D2011 1215 D521.jpg
Three generations of Mars rovers

In space, NASA used a mechanical arm for new planetary discoveries. One of these discoveries came from sending a rover to another planet and collecting samples from this planet. With a rover, NASA can just keep the rover on its designated planet and explore all they want. Mechanical arms are also attached to the ships that are acting as satellite stations in Earth's atmosphere because they help grab debris that might cause damage to other satellites. Not only that, but they also keep astronauts safe when they have to go make a repair to the ship or satellite. Now, space isn't where all the rover's with mechanical arms are. Even the SWAT team and other special forces use these rovers to go into a building or unsafe area to defuse a bomb, plant a bomb or repair vehicles. [8]

Everyday Mechanical Arms

Every day a person might be using a type of mechanical arm. Many mechanical arms are used for very ordinary things like being able to grab an out of reach object with the pincer mechanical arm. A simple system of 3 joints squeezes and releases motion causing the pincer to close and finally grab a desired object. Even the objects that might seem super simplistic like tweezers can be classified as a mechanical arm. This simple object is being used millions of times daily all thanks to the help of an engineer making a simple, but great design. [9]

Modifications and Advancements

Muscle Tissue for Mechanical Arms

The National University of Singapore has started making artificial muscle tissue to be able to be placed in mechanical arms to be able to help people pick up heavy loads. This artificial tissue can pick up to 500 times its own weight. Depending on how much of the tissue engineers place in the mechanical arm, the greater lift strength the arm has. A regular human well-grown adult weighs around 160 to 180 pounds. Now, a person weighing that much could be able to lift an object that weighs around 80,000 pounds. This would make construction sites a lot safer being able to just walk up with the construction supplies instead of using a crane that can collapse due to harsh weather. Soon, utility vehicles for construction may be a thing of the past. [10]

Sensor Mechanical Arms

New mechanical arms being used for prosthetics are starting to gain sensors that, with the help of a chip attached to one's spinal cord, allows a person to move the arm. Since sensors can easily be programmed to have a higher sensitivity to anything the sensor touches, people with prosthetic arms will also be able to feel the object they are touching. With this, a person could feel even the slightest vibration. This could be a danger and a good thing. It can danger the human because if dealt with to much pressure the person with the prosthetic can suffer severe pain. Besides actually obtaining the sense of touch back, one could also sense more awareness of incoming danger. [11] [12]

Lifelike Mechanical Arms

Lifelike mechanical arms, along with ordinary human arms, are so similar that it may be hard to distinguish between the two. The reason for this is because a spray, that places a coat on the prosthetic arm, makes the arm look real. This futuristic fantasy is beginning to become more of a reality. Scientists are even starting to create sleeve type artificial skins to keep a prosthetic arm looking like a normal arm. This will allow people with prosthetics to not feel self-conscious of their robotic arm. [4]

See also

Related Research Articles

<span class="mw-page-title-main">Robot</span> Machine capable of carrying out a complex series of actions automatically

A robot is a machine—especially one programmable by a computer—capable of carrying out a complex series of actions automatically. A robot can be guided by an external control device, or the control may be embedded within. Robots may be constructed to evoke human form, but most robots are task-performing machines, designed with an emphasis on stark functionality, rather than expressive aesthetics.

<span class="mw-page-title-main">Prosthesis</span> Artificial device that replaces a missing body part

In medicine, a prosthesis, or a prosthetic implant, is an artificial device that replaces a missing body part, which may be lost through physical trauma, disease, or a condition present at birth. Prostheses are intended to restore the normal functions of the missing body part. Amputee rehabilitation is primarily coordinated by a physiatrist as part of an inter-disciplinary team consisting of physiatrists, prosthetists, nurses, physical therapists, and occupational therapists. Prostheses can be created by hand or with computer-aided design (CAD), a software interface that helps creators design and analyze the creation with computer-generated 2-D and 3-D graphics as well as analysis and optimization tools.

<span class="mw-page-title-main">Industrial robot</span> Robot used in manufacturing

An industrial robot is a robot system used for manufacturing. Industrial robots are automated, programmable and capable of movement on three or more axes.

Biorobotics is an interdisciplinary science that combines the fields of biomedical engineering, cybernetics, and robotics to develop new technologies that integrate biology with mechanical systems to develop more efficient communication, alter genetic information, and create machines that imitate biological systems.

BrainGate is a brain implant system, currently under development and in clinical trials, designed to help those who have lost control of their limbs, or other bodily functions, such as patients with amyotrophic lateral sclerosis (ALS) or spinal cord injury. The Braingate technology and related Cyberkinetic’s assets are now owned by privately held Braingate, Co. The sensor, which is implanted into the brain, monitors brain activity in the patient and converts the intention of the user into computer commands.

Domo is an experimental robot made by the Massachusetts Institute of Technology designed to interact with humans. The brainchild of Jeff Weber and Aaron Edsinger, cofounders of Meka Robotics, its name comes from the Japanese phrase for "thank you very much", domo arigato, as well as the Styx song, "Mr. Roboto". The Domo project was originally funded by NASA, and has now been joined by Toyota in funding robot's development.

<span class="mw-page-title-main">Joseph Engelberger</span> Pioneer in robotics

Joseph Frederick Engelberger was an American physicist, engineer and entrepreneur. Licensing the original patent awarded to inventor George Devol, Engelberger developed the first industrial robot in the United States, the Unimate, in the 1950s. Later, he worked as entrepreneur and vocal advocate of robotic technology beyond the manufacturing plant in a variety of fields, including service industries, health care, and space exploration.

<span class="mw-page-title-main">Unimation</span> American robotics company (1962-88)

Unimation was the world's first robotics company. It was founded in 1962 by Joseph F. Engelberger and George Devol and was located in Danbury, Connecticut. Devol had already applied for a patent an industrial robotic arm in 1954; U.S. patent 2,988,237 was issued in 1961.

Prosthetics, the artificial replacement of organic limbs or organs, often play a role in fiction, particularly science fiction, as either plot points or to give a character a beyond normal appearance. Numerous works of literature, television, and films feature characters who have prosthetics attached.

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<span class="mw-page-title-main">Robotic arm</span> Type of mechanical arm with similar functions to a human arm.

A robotic arm is a type of mechanical arm, usually programmable, with similar functions to a human arm; the arm may be the sum total of the mechanism or may be part of a more complex robot. The links of such a manipulator are connected by joints allowing either rotational motion or translational (linear) displacement. The links of the manipulator can be considered to form a kinematic chain. The terminus of the kinematic chain of the manipulator is called the end effector and it is analogous to the human hand. However, the term "robotic hand" as a synonym of the robotic arm is often proscribed.

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<span class="mw-page-title-main">Robotics</span> Design, construction, use, and application of robots


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  11. "Prosthetic Limbs, Controlled by Thought". The New York Times. 2015. Retrieved 13 February 2017.
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