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Robotic arms are machines that are programmed to execute a specific task or job quickly, efficiently, and extremely precisely. Generally motor-driven, they are most often used for the fast and consistent performance of heavy and / or highly repetitive procedures over extended periods of time, and are especially valued in the industrial production, manufacturing, machining and assembly sectors.
A typical industrial robot arm includes a series of joints, joints, and manipulators that work together to closely resemble the movement and functionality of a human arm (at least from a purely mechanical perspective). A programmable robotic arm can be a complete machine on its own, or it can function as an individual robot that is part of a larger, more complex team.
Today large number of robotic arms are used by countless industries and workplace for various application. The larger versions can be floor mounted, but either way they tend to be constructed of strong, durable metal (often steel or cast iron), with most featuring 4-6 knuckle joints. Again, from a mechanical perspective, the key joints of a robotic arm are designed to closely resemble the main parts of its human equivalent, including the shoulder, elbow, forearm, and wrist.
How Do Robotic Arms Work?
- The joystick in this application is essentially two potentiometers and those two potentiometers are X-axis and Y-axis. When you push or pull the joystick in either direction, you are essentially changing the resistance value of one or both of the knobs.
- When the resistance changes, the joystick draws a voltage from each of its axes and feeds the variable voltages to two pins of the analog-to-digital converter (A0, A1) on the Arduino and Arduino Uno shield.
- The Arduino uses its built-in analog-to-digital converter (ADC) to convert analog data to digital data. This conversion is called quantization. Once the data is converted to digital, the code can use it to determine what position each servo must be in to achieve a desired movement and / or position. See the code comments for an explanation of the code.
The Robotic Arms Are Used to !!
Robotic arms can be used for all kinds of industrial manufacturing, processing and production functions; in fact, any task that requires extremely precise, fast and repeatable movements.
In all cases, selecting the correct type of programmable robot arm for a given function or task must involve consideration of the precise nature and requirements of the intended application. These will generally include:
All types of robot arms have a certain load capacity, and this number specified by the manufacturer should always exceed the total weight of the payload involved in any work you expect the arm to perform (including tools and accessories).
This criterion is generally defined by the footprint and mounting position of the robot arm, and how well it fits together with the other equipment on your production line for the range of movements and manipulations it is expected to perform. This, in turn, will influence where the arm can be physically positioned in relation to the objects it will be moving.
Certain types of robotic arms require larger bases or greater physical clearance to perform their programmed range of motion, and these factors must be considered in terms of other equipment or workers in the vicinity.
Particularly when choosing robotic arms for pick and drop applications, it is important to pay attention to the manufacturer’s ratings for speed, and especially in terms of acceleration over longer distances.
Tolerances and accuracy over wider spans can be reduced on certain types of robot arms, due to arm deflection and differences in support structure design.
If the application requires longer travel distances between payloads or work areas, this can dictate what type of robot arms would be suitable or inadequate to perform the task, depending on the stiffness of the required tolerances.
Certain types of programmable robotic arms are inherently designed to be more precise in their range of motion and joints than others. This can come at a higher cost for a more complex machine and involve a compromise with other factors such as size, speed, potential travel distance, and orientation.
Consideration of atmospheric conditions and potential hazards (including levels of dust, dirt, and humidity) in the immediate work environment will be important when choosing an appropriate robotic arm type for a specific location.
This is essentially an evaluation of how hard the robotic arm is expected to work and for how long between “rest” or maintenance periods. Obviously, wear and tear will become a problem sooner for a robot arm that works continuously, as opposed to one that only works during standard shift cycles.
Various Types Of Robotic Arms
There are varieties of robotic arms available in market and each have their own feature and purpose. So here are some types of robotic arms explained for you.
1. Cartesian robotic arm:
This robotic arm has three prismatic joints. The axes of these joints coincide with a Cartesian coordinator. A Cartesian robotic arm can be used for pick-and-place, assembly operations, arc welding, and machine tool handling.
2. Cylindrical robotic arm:
This type of system has axes that form a cylindrical coordinate system. The cylindrical robotic arms can be used for spot welding, handling of die casting machines and other machine tools, as well as for assembly operations.
3. Spherical or Polar Robotic Arm:
This type of robotic arm has axes that form a polar coordinate system. Spherical robotic arms can be used for gas welding, arc welding, spot welding, die casting, deburring machines, and handling tools.
4. SCARA robotic arm:
This type of robotic arm features two parallel rotating joints that provide flexibility in one plane. It can be used to apply sealant, perform pick and place functions, perform assembly operations, and work with machine tools.
Buying Guides On Robotic Arms
If you are a beginner and you are going to buy a robotic arm for your industrial or personal use. So here we guide you some essential features of a robotic arm before you buy it.
Maximum load that carry by a robotic arms in its workspace is called payload. If you want to transport a part from one machine to another, you must incorporate the weight of the part and the weight of the robot gripper into the payload. So before buying you have to check the payload capacity of the robotic arms.
Number of axles
The number of axes of a robot is directly related to its degree of freedom. If you are looking for a really simple application, like picking up and placing from one conveyor to another, a simple 4-axis robot is enough. However, if your application needs to run in a small workspace and the robot arm needs to twist and turn a lot, a 6 or 7 axis robot would be the best option. Generally, the number of the axes depends on your application.
Particularly when choosing robotic arms for pick and drop applications, it is important to pay attention to the manufacturer’s ratings for speed, and especially in terms of acceleration over longer distances. . In fact, it depends on the speed at which the work has to be done. The specification sheets always express the maximum speed, but you should know that all speeds can be reached between 0 and the maximum speed.
Again, this factor depends on your application. Repeatability can be described as the ability of the robot to reach exactly the same position each time it completes a routine. If your robot is required to build an electronic circuit board, you may want to have a super repeatable robot. If your application is quite complicated, robotic arms are the best for you.
The mass of the robot is an important factor when designing a robot cell. If the industrial robot needs to be seated on a custom bench or even on a rail, you may want to know its weight to design the corresponding stand.
Robotic arms are fast, accurate, and reliable, and can be collectively programmed to perform a nearly infinite range of different operations. So I hope you get a complete idea about robotic arms and spend your precious money on the right brand after reading the buyer’s guide.