When you think of robots, you might picture a vaguely human-like machine marching around in a futuristic setting or perhaps you think of a massive arm swirling around objects on an assembly line. A new generation of robots has come on the scene and is growing in numbers and capabilities. First developed by General Motors in the mid-1990’s, collaborative robots, also called
Why consider a collaborative robot?
Cobots can increase throughput, reduce stress and potential injuries to employees, and even transition them into more meaningful and skilled work. As collaborative robot technology continues to advance and improve, prices drop so you could see a return on your investment in a few years or less. If you shop carefully and study the specs, your cobot investment could benefit you well into the future.
This might bring to mind images of a job shop filled with automated equipment and no human beings in sight. The reality is collaborative robots exist to help humans, not to replace them or eliminate their jobs. Tasks that are tedious and repetitive are not only boring, they pose risks of error or injury as workers become fatigued. An employee may slow down or miss a step at the end of a long shift, but a
They also offer flexibility. Many models are easily programmed with a user-friendly graphical interface or by hand-guiding the robot arm through the needed movements. No coding expertise is required, which means a robot can be used in more than one location and easily “trained” by the humans working
Flexibility also comes from the variety of grippers and tools available. End of arm tools (EOAT) are often easy to swap out, allowing the robot to do a variety of tasks (e.g. pick up, weld, grind, dispense). Some models can be equipped with vision cameras and sensors to enable the robot to scan items and distinguish one piece from another.
What are your applications?
Applications with repetitive, boring (and therefore mistake-prone) or tedious component tasks are the best-suited for
- Material handling (e.g. pick and place, packaging, palletizing)
- Machine tending (e.g. loading and unloading a machine, waiting during a
cyclefor the next step)
- Process tasks (e.g. weld, glue, dispense)
- Finishing (e.g. grind, polish, deburr)
- Inspection/visual tasks (e.g. quality control, sorting mixed items)
Cobots also have limitations. As you analyze your applications, consider:
- Payload - This is the combined weight of the workpiece and any tooling. To determine the amount of weight your cobot can safely handle, subtract the weight of the end-of-arm-tool from the maximum payload. While most cobots have a maximum payload between 4 and 10 kg, some have a capacity as high as 35 kg (77 pounds).
- Reach and rotation – Cobots generally operate from a fixed location and have a maximum reach of about 71 inches. Consider how many degrees it will have to twist and turn as it operates too.
- Cycle time/speed – Working in proximity to humans means the robot must maintain a safe speed to avoid injury and collision.
- Size – Most
cobotsare small enough to mount on a tabletop or other work surface, which could limit the size of workpieces or tools they can manipulate.
Are they safe?
Cobots are often advertised as “inherently safe.” Compared to their full-sized, caged, industrial robot relatives, they are far safer for humans to be around. However, Robotiq CTO Jean-Philippe Jobin cautions, “it’s a common misconception that if the robot is ‘inherently safe’ then the operation is safe. Not true. For instance, if your robot is manipulating sharp objects, then it is not safe to have a human beside it, without protective safety measures. Another case is if the robot is handling a heavy object, which could cause injury if it’s dropped or become a projectile at a particular rate of speed.”
Built with the purpose of sharing a close work area with humans,
Before installing a
- Severity of injury
Possibilityof injury occurrence Possibilityof injury avoidance Frequencyof exposure to risk
Sources:What are collaborative robots and why should you care? - packagingdigest.com
Collaborative robots and safety hand in hand - robotics.org
Collaborative Robotics And Sensing Technologies Reshape The Manufacturing Environment - robotics.org
Collaborative robots market update 2018 - robotics.org
Are You Planning to Adopt Cobots? Here are 6 Common Applications - businessblogshub.com
How to shop for a collaborative robot – modernapplicationsnews.com
7 Common applications for
How to evaluate a risk for a collaborative robot – Robotiq - youtube.com