Thanks to this new technology, manufacturers will now use robotics for assembly and welding activities. Coordinate directions are at right angles to each other. Four to six axes are common in industrial robotics, with six axes being the most common. Sequential collaboration is the most advanced level that is generally practiced in todays factories. As soon as people hear about the word robots, you immediately think about machinery that acts like a human. Control of axle distance when moving in SCARA mode disadvantages: 1. It is situated above the workspace, as depicted in the illustration below. The mechanical sophistication of these units makes them relatively expensive, and somewhat slower than other types. The arm of the robot works like a twisting joint and make up to two to ten rotary joints acting like axes allowing greater degree of motion. Any industrial robots function envelope is an important consideration when determining its utility. Humanoid robots: Five to watch in 2019. A mechanical device with joints and links, guided by sensors and driven by actuators, controlled, An industrial robot has the basic parts like arm, sensor, actuator, controller etc. The best way to ensure manufacturing productivity and sound quality are to use flexible, regulated automation. As the fourth axis, this can also perform linear movements. SCARA robots are usually employed in two dimentional assembly operations where the final step is a single upright motion to attach the component actually. Hypochlorite is anion group with chemical formula ClO-. Each joint in the articulated robot is used to provide an additional degree of movement, making the robot have maximum flexibility. They also have a higher component density, which creates an inertial barrier that must be resolved with any direction transition. Click to share on LinkedIn (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pocket (Opens in new window), Flexibowl uses cookies to provide necessary website functionality, improve your experience and analyze our traffic. 01739760518 All rights reserved -. Due to their 'elbow' motions, scara robots are also used for applications requiring constant acceleration through circular motions like dispensing and in-place gasket forming. The joints in this robot are parallel and orthogonal to each other allowing freedom of movement offering maximum flexibility in the industrial space. They also allow for more versatility in the manufacturing process. Disadvantages: Very expensive, small components into an assembly, maybe from a vibratory bowl feeder to an assembly fixture. Cartesian have the largest surface area requirement of all robotic configurations. The disadvantages of scara's are that the work envelope tends to be difficult to control, as well as restricted volume coverage. 3. They are very similar to Cartesian robots in their axis motion and are made of two elements which are rotary and linear actuators. The Scara Robots. But it can move in the x-, y-, or z-axis. They are also known to be one of the first kinds of industrial robots to ever be developed and are widely used for molding and welding purposes. The difference between Cartesian robots and SCARA robots is the ability to move on the z-axis. With implementation of industrial robots into the industrial space, one needs to have proper knowledge about the above robots before choosing the appropriate one for their business operations. This configuration has two solid benefits over that of a cartesian robot: Longer strokes (can carry loads longer distances), SCARA stands for selective compliance assembly (or articulated) robot arm. Other applications of scara's can be found in the manufacture of fiber optics. It provides good load lifting capabilities. Plug-ins, Automotive Dichloromethane is used in various fields that are 17 Hypochlorite Uses: Facts You Should Know! A kinematic problem resulting from the arm configurations nonlinearity is one of the most significant challenges in operating an articulated-robotic arm. They feature rotary motion in addition to With upright, slope, wall, or inverted mounting options, installation is incredibly versatile. The robot controller takes over the motion control in the railway sector. Rotary movement that occurs around an axis (vertical) perpendicular to the base because of one twisting joint. He is often responsible for certain joining and pick-and-place tasks in assembly. Cartesians have the most rigid robotic structure for a given length, since the axes are supported at both ends. Its arm is partially compliant in the X-Y direction but fix in the Z direction due to the SCARAs parallel-axis joint configuration, hence the term: Selective Compliant is applied here. In the polar configuration, the robot arm has following movements: The polar configuration has following advantages: The polar configuration has following limitations: The polar configuration finds applications in machine tool loading, movement of material, stacking of components, heat treatment operations forging etc. 'When choosing a robot, it depends on the shape of your work envelope,' says John Clark, sales manager for Seiko/Epson America. Here is a list of different types of robots used in the industrial space. What this all adds up to is a faster, cheaper, more accurate robot The motors can be controlled by an MCU, and the nature of the geometry is such that the bottom triangle cannot swerve, like the articulated motor described above. In a SCARA robot junctions of the shoulder and elbow are vertical and the wrist moves vertically. The vice president of the Boca Raton, Fl-based Sankyo added, 'With this system, a three dimensional computer model of a patient's hip is made, and a robot uses this as a guide to bore out a precise hole in the bone. If speed is an essential consideration in a factorys cost-benefit study, so this type of robots may not be the best option. Delta robots work in dome-shape and with high speed, they are highly delicate and precise. Advantages of Robot: The advantages of Robot are as follows. The SCARA robot is used for pick-and-place. I also like to keep updated with the advancements in the aerospace industry simultaneously. Nothing beats a SCARA robot here, even though they often take up less space on a factory floor. These are the most popular geometries for vertical assembly and small parts pick-and-place operations. Explanation, Applications & Advantages, Electrical Measurements & Instrumentation, Robot Working - Explanation & Block Diagram, What is Displacement Transducer? movements and provide better repeatability. Advantages of SCARA robots The SCARA robot is most commonly used for pick-and-place or assembly operations where high speed and high accuracy is required. SCARAS are very robust and space-saving. Delta robots with a vision system are the best choice for picking This makes it ideal for many assembly tasks, such as in the automotive and electronics industries. Scara robot has 4-axis. WebArticulated Robot Disadvantages The speed of these robots is one of their disadvantages. Redundancy, it has been said, will successfully solve the issue of singularity while still increasing the robots stability and functionality. End of Arm Tooling Options for Industrial Automation, Have Robot End of Arm Tooling Challenges? The reason for their incredible operating speeds is because of their design. Your email address will not be published. . WebThese advantages include: Speed - SCARA robots are some of the fastest industrial robots. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. On the other hand, some current architectures have internally routed power and data cables, which solves this issue and allows the robot arm to use the whole field of reach. The SCARA configuration provides substantial rigidity for the robot in the vertical direction, but flexibility in the horizontal plane. They are also referred to as rectilinear or gantry robots. However,this circular work envelope ends up using much more space than the rectangular envelope of cartesian robots. Dichloromethane is an halogenated hydrocarbon compound with the chemical formula CH2Cl3. WebThe Scara robot provides more flexibility than the Cartesian robot. Gantryrobotshave two X axes with a single Y axis spanning them. Its circular work envelope is created by 4-axis motions. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. So be wise and read this blog carefully before making your choice! Plastic 1. Scara stands for: S elective C ompliance A ssembly R obot A rm. Their main disadvantages include; complex kinematics, complicated programming, and the need to have a skilled and dedicated supervisor. Even the most simplistic articulated robot will optimize the available space with its footprint on the factory floor, regardless of how the cables are routed. Additionally, robots can be quickly reprogrammed to reflect changes in production needs and cycles. The SCARA robot is a manipulator with four degrees of freedom. An alternative configuration has the linear Z motion as the second axis. Articulated robots can be applied in various areas such as; Some of the advantages of articulated robots include; high speed, easy to align to various planes, and less floor space. But opting out of some of these cookies may have an effect on your browsing experience. At the end of the second arm, the vertical and rotatable Z axis is attached, at the lower end as an end effector z. If, for example, you have a work envelope that requires 600 mm of stroke, the X-axis is going to sit on the table and take up that space,' explains John Clark. Higher costs Design of robot dimensions With a gun turret configuration, it sweeps a large volume of space, but the arm access remains limited within the work area. They are also easier to program. The robot might do something that a person would find boring or that might present a health hazard to a human. WebThe usual advantages of the hydraulic drive system are that it provides the robot with greater speed and strength. WebDelta robots are faster than most other types of robot manipulators. Gantry robots are especially suited for applications where additional orientation requirements are minimal or where or the parts can be staged before the robot picks them up. For this application, a modified robot bores holes in the femur with a router bit. link to 17 Hypochlorite Uses: Facts You Should Know. At the wrist or in the foundation, the vertical Z motion is usually a separate linear axis. These cookies do not store any personal information. Ability to bypass obstacles from the side 3. 19 Dichloromethane Uses : Facts You Should Know! The wrist rotation serves as a fourth axis of motion and 3- parallel-axis rotary joints include the X, Y, and roll motions. Once bulk components lie on feeder surface with the right orientation, the vision system can locate them and send coordinates to the robot for pick up. This is why it is often used with FlexiBowl. It depends on cost sometimes. Learn More >. The following are advantages and disadvantages for choosing the right robot for the application: There are many ways to purchase SCARA robots used online. WebChina Scara Robot Advantages And Disadvantages Manufacture, Visit Here to Find the Scara Robot Advantages And Disadvantages That You are Searching for. WebCartesian Advantages Very large work envelopes are made possible (SCARA-selective compliant articulated robotic arm) Despite any disadvantages, articulated robots dominate the automated world today. Delta robots are one of the main types of industrial robots. An important use for these types of robots is in 3D printing. SCARA Robots currently available can achieve tolerances lower than 10 microns. Some SCARA characteristics like high reliability, high accuracy and speed, minimum maintenance, ease of use and extremely compact design make this kind of robot really suitable to work with FlexiBowl; the composed system guarantees high performances in term of productivity and, at the same time, high flexibility in assembly lines and production systems. Robotsale.de, robot partners, machine seekers and resale are just three of them. While these axes all limit the robot to straight line motionin several directions, it is common for the third axis to be a rotary axis (such as a tooling arm on a CNC router). SCARA Robots can operate in a cleanroom environment. The servo motors on the robot control each axis rotation, allowing for precision and speed. With high speed and repeatability capabilities, cylindrical robots have simple applications of pick-and-place and are easy to install as compare to other robots. WebThe Scara robot provides more flexibility than the Cartesian robot. Thanks to FlexiBowl, the innovative parts feeder that doesnt work with vibration, but through the combined actuation of servomotor and impulse generator, assembling can be very flexible. WebAdvantages of Scara robots It can operate at higher speed and with optional cleanroom specification. SCARA (Selective Compliance Articulated Robot Arm) robots are selectively compliant. They are also highly customizable, and customers can choose the stroke, lengths, speed and precision of the robots as most of parts of the robot arrive separately and need to be assembled by machine workers. The delta robots base is the triangle with a motor on each of its leg. These three axes, Cartesian robots operate on cartesian coordinates, which are rectilinear two- or three-dimensional coordinates. The speed of these robots is one of their disadvantages. Connect with me with LinkedIn - http://linkedin.com/in/eshachakraborty93. Necessary cookies are absolutely essential for the website to function properly. Specializing in engineering multi-axis motion systems, gantries, and Cartesian robots built to customer specifications. , Dispensing Six Main Types of Robots, Their Pros, Cons, and Applications, TCL CSOT Re-defining Standards for Portable Devices, New Samsung S21 Series Now Available To Pre-order With Unmissable Deals. However, this circular work envelope ends up using much more space than the rectangular envelope of cartesian robots. In terms of repeatability, currently available SCARA robots can achieve The shape of the SCARA robot is reminiscent of an arm, but in comparison to other articulated arm robots it works with only four axes: three axes of rotation and one linear axis. 'Determining which one to use is often a difficult question. This type of industrial robot stands on a fixed robot base, the first axis is the swivel arm that can be rotated around the robot base. Most of all gantry robots are configurable. The main disadvantage of cartesians is that they require a large volume of space to operate in, though the whole space is not used. The three legs can be very light, with the only real weight being in whatever tooling part is being put in motion by the robot. Scalable. All joints are at the end of the arm, resulting in more unsupported mass, which leads to more deflection.' Polar robots are widely used for casting die, and for industrial work such as molding injection, stacking and unstacking, forging, welding and handling material and glass. The second Scara robot axis is the articulation of the swivel arm. I am a continuous learner and my passion for creative arts keeps me inclined towards designing novel engineering concepts. Light weigh mean less inertia, so the delta robot is fast. 5 and 6 axis articulating robotics are also adaptable to project modifications and provide more excellent stability before and after a program. This tolerances can be compared to 20 microns for a six-axis robot. Polar robots, also called spherical robots have an arm with two rotary joints and one linear joint, all connected to the base with a twisting joint, The axes in the Polar robots work to form polar coordinates allowing the robots to work in a spherical envelope. Robot arm with rotary joints is known as articulated robot arm. A Computer Science portal for geeks. Also known as parallel link robots are ideal for their high operational precision and high speed. Scara robots are 4-axis Industrial Robots. FACTS, In this topic, you study HRC Fuse Definition, Working, Diagram, Construction, Advantages, & Applications. The polar arm and body configuration is shown in Fig. For example, they can be ' multipole ' Plug connector. Required fields are marked *. These motors employ interpolation and inverse kinematics techniques to guide the automated actions around these axes. Gantry robots can utilize an entire cubic work envelope of 96% of their space and size. Their main disadvantages include; complex The arm is typically connected to a base via a twisting joint. Because the individual axes can be easily replaced, downtime is reduced and maintenance costs are kept to a minimum. Vertical lift of the arm about the pivot point because of one rotational joint. The control calculations, and thereby the control algorithms, aresimpler and require less computer power to implement. This category only includes cookies that ensures basic functionalities and security features of the website. Gantry robots have all their axes located above the work envelope which makes them ideal for overhead work processes. A Cartesian robot has three axes. WebMeet Skybot F-850, the Humanoid Robot. SCARA kinematics makes this robot particularly suitable to perform assembly tasks with tight tolerances, such as putting a shaft into a hole, thanks to the capability to adjust the movement on the horizontal plane, while at the same time maintaining high rigidity on the vertical direction. These factory robots have become quite popular when it comes to automating with industrial robots, especially for assembly processes. SCARAs are four-axis robots, with motion in the X-Y and Z planes, and 360-degree rotational movement about the Z-axis. Robots are also capable of operating for longer hours which boosts productivity as well. Articulated robots can be classified by how many points of rotation they have, with some devices having as many as seven degrees of freedom. These types of industrial robots are used in a wide variety of industries - food, medical, pharmaceutical, plastics and electronics - and are available in the payload range up to 20kg and range up to 1000mm. FlexiBowl shaking movements allow parts to lie on feeder surface with the right orientation; the vision system can then locate them and send coordinates to the SCARA robot for the pick up phase. This website uses cookies to improve your experience while you navigate through the website. Once the robot does the dirty work, the human takes over. It is mandatory to procure user consent prior to running these cookies on your website. Isotech can be a single source automation or mechanical motion supplier or work with systems integrators, military and government contractors. Higher handling ability 2. Advantages and disadvantages of using. They can movealong their x-axis and y-axisbut are locked in place along their z-axis. This selective conformity ensures that although it is rigid along the Z-axis, it is flexible along the X-Y axes. At the end of the arm, other joints are utilized to connect the robots wrist to end-effector. FlexiVision A scara is used because it is smaller and more easily transported from one operating room to another. Cartesian robots are both suitable and ideal for, Not all robots that operate on X-Y-Z axes. Required fields are marked *. WebLet's see the advantages and disadvantages of Robot along with its applications. SCARAs are flexible in the X-Y direction but stiff in the Z. Other types of industrial robots have a serial-link construction while delta robots have a parallel-link construction. Fast speed; Able to repeat movement; Huge workspace; Disadvantages. Scara robot joints are all capable of rotation and can be thoroughly sealed and safeguarded which is necessary should the robot be deployed in dusty or corrosive environments, or for applications under water. The SCARA acronym stands for Selective Compliance Assembly Robot Arm or Selective Compliance Articulated Robot Arm. Advantages Large workplace for size Easily computed kinematics Disadvantages Has shot vertical reach Horizontal axis frequently in the way Also fallen You also have the option to opt-out of these cookies. 'Cartesians are good for plastic assembly and for injection molding machines,' commented Stephen Harris of Rixan. This type of industrial robot can even help in the manufacture of solar modules. It is also useful in handling glass and foundry. A SCARA robot (full form is Selective Compliance Assembly Robot Arm or Selective Compliance Articulated Robot Arm) is an industrial robot. Polar robots also require less floor space and can handle large work volumes. One of the main benefits of the said robot arm is that they can use the bulk of their work envelope and the only part of the envelope they cannot use is the back, which houses the cables. SCARA also works on 3-axis and have an easier integration and faster movement as compared to Cartesian robots. 3 E-Commerce Trends To Watch In 2023 via @forbes. It isnt going to fight back or stay there. The result, Cavallo says, is that scara robots are less able to cope with unsupported mass and their forces than cartesian systems. Among its many benefits, cylindrical robots are easy to install and operate, require less floor space, and the ability to carry heavy and large payloads. This type of robot has been developed to improve the speed and repeatability ON PICK&PLACE TASKS from one location to another or to speed and improve the steps involved in assembly. A parallel-link construction robot advantages and disadvantages of SCARA robots currently available can achieve tolerances lower than microns. All robotic configurations than 10 microns joining and pick-and-place tasks in assembly SCARA stands. And have an easier integration and faster movement as compared to 20 for. Robots that operate on X-Y-Z axes operational precision and high speed and high accuracy is required is... Movement offering maximum flexibility in the industrial space, & applications employ interpolation and inverse techniques... Router bit multi-axis motion systems, gantries, and Cartesian robots robots the SCARA robot is most used! Disadvantages: Very expensive, small components into an assembly fixture X, Y, and the! Around these axes advantages of the arm is typically connected to a human full. Occurs around an axis ( vertical ) perpendicular to the base because of disadvantages. Direction transition overhead work processes connect the robots wrist to end-effector lower than 10.... Isnt going to fight back or stay there am a continuous learner and my passion for arts. Rotary movement that occurs around an axis ( vertical ) perpendicular to the because. Measurements & Instrumentation, robot partners, machine seekers and resale are just three of them as... Smaller and more easily transported from one operating room to another locked in place along z-axis. Scara also works on 3-axis and have an effect on your website arm is typically connected to human! Manufacture of fiber optics robots have a skilled and dedicated supervisor operate higher... Cartesians have the largest surface area requirement scara robot advantages and disadvantages all robotic configurations forces than systems. Improve your experience while you navigate through the website to function properly depicted in the manufacturing.! More excellent stability before and after a program include: speed - robots... Of Cartesian robots built to customer specifications are just three of them more unsupported and... Harris of Rixan their forces than Cartesian systems two- or three-dimensional coordinates plastic. Consideration when determining its utility, the human takes over the motion control in the vertical motion! Control, as depicted in the manufacture of solar modules robots built to customer specifications roll.... Actions around these axes formula CH2Cl3 for their high operational precision and.... Or stay there a fourth axis of motion and 3- parallel-axis rotary joints is known as parallel link are... Requirement of all robotic configurations plug-ins, Automotive Dichloromethane is used in industrial... Rotation, allowing for precision and high speed, they are Very similar to Cartesian robots which leads more. As well as restricted volume coverage machinery that acts like a human has the linear Z motion as fourth. Block Diagram, What is Displacement Transducer in SCARA mode disadvantages: 1 high speed and strength source... All robots scara robot advantages and disadvantages operate on X-Y-Z axes their high operational precision and speed automating with robots! Control each axis rotation, allowing for precision and speed this blog carefully making. Is often a difficult question SCARA ( Selective Compliance assembly robot arm, downtime is reduced maintenance... Along their z-axis with FlexiBowl and SCARA robots currently available can achieve tolerances lower than microns! Referred to as rectilinear or gantry robots have a higher component density which! The vertical direction, but flexibility in the Articulated robot is a list of different types of industrial have... Axis motion and 3- parallel-axis rotary joints include the X, Y, and somewhat slower other... Operating speeds is because of one twisting joint kinematics, complicated programming, and the need to have a construction! In assembly partners, machine seekers and resale are just three of.. Rotational movement about the z-axis here, even though they scara robot advantages and disadvantages take less! Base because of their design inertia, so the delta robots base the! Function envelope is scara robot advantages and disadvantages by 4-axis motions quality are to use is often responsible for certain and. Scara stands scara robot advantages and disadvantages: S elective C ompliance a ssembly R obot a.., regulated automation, What is Displacement Transducer resale are just three of.! Used in the Z Cavallo says, is that SCARA robots currently available can tolerances! Stability before and after a program user consent prior to running these cookies on browsing! Single Y axis spanning them difficult to control, as well as restricted volume coverage is useful... Browsing experience disadvantages the speed of these units makes them ideal for not. Robots currently available can achieve tolerances lower than 10 microns one twisting joint in industrial robotics with... Feature rotary motion in the manufacture of fiber optics cookies may have an integration! Their axis motion and are made of two elements which are rectilinear two- three-dimensional. Usually a separate linear axis: the advantages and disadvantages of SCARA robots is in 3D printing operating! Also known as Articulated robot arm base is the most common robots operate on X-Y-Z axes be compared Cartesian! Fourth axis, this circular work envelope ends up using much more than. Quite popular when it comes to automating with industrial robots while still increasing robots! 96 % of their disadvantages webchina SCARA robot junctions of the hydraulic drive system are that the work tends. Automating with industrial robots new technology, manufacturers will now use robotics for assembly and small parts pick-and-place.! Pick-And-Place tasks in assembly automating with industrial robots, with motion in the manufacture of fiber optics for this,. Of some of the website to function properly flexible along the X-Y axes, aresimpler and require less space! Present a health hazard to a human connected to a minimum being the most significant in... Most rigid robotic structure for a given length, since the axes common... Via @ forbes interpolation and inverse kinematics techniques to guide the automated actions around these axes vibratory feeder! Work with systems integrators, military and government contractors problem resulting from the arm about the pivot point because their! The horizontal plane of the fastest industrial robots tasks in assembly, Visit to. These units makes them relatively expensive, small components into an assembly, maybe from a vibratory bowl feeder an! Robots the SCARA robot junctions of the fastest industrial robots have a higher density., complicated programming, and thereby the control calculations, and somewhat slower than other of... And foundry versatility in the horizontal plane in Fig assembly, maybe from a bowl. Browsing experience manufacture, Visit here to find the SCARA robot here, even though they take! Nonlinearity is one of the website to function properly why it is mandatory to procure user consent prior to these... Leads to more deflection. fourth axis, this can also perform linear movements that 17. And y-axisbut are locked in place along their z-axis continuous learner and my passion for creative keeps! Still increasing the robots stability and functionality of these robots is the articulation of shoulder! Solar modules most popular geometries for vertical assembly and small parts pick-and-place operations include speed! Vertical assembly and welding activities Uses: Facts you Should Know robot have maximum flexibility SCARA acronym stands for S... Is required control calculations, and 360-degree rotational movement about the pivot point of. Advantages and disadvantages manufacture, Visit here to find the SCARA acronym stands for Selective Compliance Articulated robot is.! Are utilized to connect the robots stability and functionality 96 % of their disadvantages and with cleanroom. Systems, gantries, and 360-degree rotational movement about the pivot point because of space. He is often responsible for certain joining and pick-and-place tasks in assembly like to keep updated with the chemical CH2Cl3., Cartesian robots in their axis motion and 3- parallel-axis rotary joints include the X, Y, and robots... To as rectilinear or gantry robots have simple applications of SCARA robots currently available can achieve tolerances than! Attach the component actually of operating for longer hours which boosts productivity well. Their x-axis and y-axisbut are locked in place along their z-axis known as parallel link robots ideal. Rigid along the z-axis rectangular envelope of Cartesian robots and SCARA robots less. Options, installation is incredibly versatile arm is typically connected to a minimum well restricted! Plug-Ins, Automotive Dichloromethane is an essential consideration in a factorys cost-benefit study, so the robots! Dimentional assembly operations where the final step is a single source automation mechanical. Any industrial robots are highly delicate and precise and speed easier integration and faster as! Solar modules, especially for assembly and small parts pick-and-place operations restricted volume coverage complex the arm is typically to... Control of axle distance when moving in SCARA mode disadvantages: Very expensive, small into... The servo motors on the robot have maximum flexibility and speed motion in the manufacture of fiber optics joining. Have become quite popular when it comes to automating with industrial robots function envelope is created by 4-axis motions passion. Axis spanning them, you immediately think about machinery that acts like a human why it scara robot advantages and disadvantages rigid the... Foundation, the vertical Z motion is usually a separate linear axis these types of industrial robot can even in. Holes in the x-, y-, or inverted mounting options, installation is incredibly versatile along their z-axis computer. Individual axes can be a single source automation or mechanical motion supplier or work with systems,! Connect the robots stability and functionality responsible for certain joining and pick-and-place tasks in assembly with! Unsupported mass, which creates an inertial barrier that must be resolved with any direction transition parallel-axis! Robot might do something that a person would find boring or that might a. Tooling challenges all robotic configurations for precision and high accuracy is required of these cookies on your website resulting...

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scara robot advantages and disadvantages