Cobot vs robot palletizer – what to choose?

Cobot vs Robot Palletizer, what is the difference?

First things first, what defines a cobot and what defines a robot?

Cobots

The expression ”Cobot ” is short for collaborative robot. It is a robot designed to collaborate with humans. The cobot is therefore forced to operate within certain parameters to be allowed to work in the same area as humans, this is maximum speed, safety measures and human supervision. This means that a cobot is limited to productions where the speed of the conveyor/production does not exceed the speed of the cobot. They are well suited for operations where humans work closely or even alongside the conveyor, such as pick and place, polishing, grinding and machine tending tasks. 

Short and easy installation time

A few of the advantages with a cobot is the short installation time, easy interface and flexibility. A complete cobot palletizing solution can be installed in a matter of weeks, including everything from validation, fabrication and installation. 

This case story is an example of how fast it can be done. 

Smaller and more agile

In addition to the short installation time the cobots provide a simpler interface which requires minimal training to use and program. Software like Pally makes it easy to modify and adjust your cobot. Compared to an industrial robot the cobot is often much smaller in size, it can be installed in different places, comply with various tasks and does not necessarily require fencing or major area adjustments to be safe. Combined with easy programming makes the cobot a lot more flexible than an industrial robot. 

Robots (industrial robots)

A robot is not bound by the same parameters as the cobot, such as speed limitation, because it usually needs to be caged. Automation with a robot requires a “fixed workcell” to operate safely, which translates to a more comprehensive installation process and space requirements. On the other hand, the industrial robot is a more capable piece of machinery in terms of payload and speed. 

Higher payload and speed

For high volume production and fast conveyors, a robot is better suited than a cobot since it can operate at a higher pace. Another benefit of an industrial robot is that once the robot is installed with fencing and safety measures, it does not require human supervision. Lastly, reach should also be considered an advantage for robots as they can palletize higher and need less programming to adjust for reach issues.

Costs in cobots vs robots

The cost of a robot/cobot varies a lot depending on what kind of solution works for you, sometimes a “turn-key” solution works and sometimes customization is necessary. A turn-key solution for a cobot palletizer costs from 70 000 EUR depending on what kind of robot, gripper, software etc. you choose. A turn-key robot palletizer can be anywhere from 100 – 200 000 EUR, this might not include fencing and other requirements for installation. 

Palletizers

Palletizing is one of the many areas of use for robots and cobots, in short it is placing products on a pallet for shipment or storage. It used to be, or still is for a lot of SME’s, a task performed by human labor. It is a very repetitive and labor intensive task which robots and cobots are gradually taking over, this trend has led to a wide range of palletizers to choose from.

Six common solutions for robot palletizing.

1. Palletizing Robots – a good choice for many, these are designed to carry heavy payloads and have a long reach. They are usually made with an axis coupling, this means that two or more of the robot’s joints are linked together, by doing this it increases payload capacity and speed.
   
2. 6-Axis Industrial Robots – These robots are more flexible and suited to perform a variety of tasks. They are available in many different sizes, this means that finding one suited for your project should be easy. 6-axis robots are currently the robots that are capable of the largest payload on the market.
   
3. Delta Robots – they are normally used as a high-speed pick and place robot, but it is possible to program one to be used as a palletizing robot.
   
4. SCARA Robots – Not all industrial robots are big, Scara robots are smaller robots with a payload capacity from 3 – 20kg. The Scara robots are designed to only move along the x and y axis, while the Z axis is locked in place. Usually used for light and detailed tasks, but can also be used for palletizing.
   
5. Gantry Robots – Also known as cartesian or linear robots, they are mounted on an overhead system which allows horizontal movement. They are capable of large payloads and usually perform pick and place tasks.
   
6. Collaborative Robots – “Cobots” differ from traditional industrial robots as they are meant to share workspace alongside people and are easy to operate. Because of this, cobots are smaller and slower. They are designed with smooth edges and come with an easy-to-use interface which makes anyone a programming expert. 
   

Universal Robots also recently announced their new UR20 cobot, with max payload of up to 20 kg. It may not be certain, but they expect to be shipping in Q2 2023 and will begin to sell the robot in Q4 2022.

Click here to learn everything you need to know about the UR20 cobot.

Cobot vs robot palletizing

As seen in the table above, cobots and robots are quite similar. But at the same time they’re not, because they’ve got their own individual strengths. These key factors should be taken into account when choosing a palletizer. 

Price

As stated above there could be a significant difference in terms of price on robots and cobots. An industrial robot requires a heavier investment upfront, it needs more resources like floor space and the organization must be financially capable to handle a longer ROI. A cobot has a lower upfront investment than a robot, it does not require the same amount of floor space and the ROI is a lot shorter due to less costs.

In addition to upfront costs there is maintenance and electrical expenses, the maintenance expenses vary a lot depending on what kind of equipment you are using, the electrical costs vary by the size of the robot. Lastly, a cobot is a lot easier and cheaper to reprogram or modify to do different tasks than an industrial robot.

Safety 

The requirements for safety is a big part of the reason why industrial robots need more floor space, they need heavy fencing and sometimes extra sensors. A Cobot is usually installed without fencing and extra sensors, this means that it can be installed with less floor space available.

Payload

The payload is one of the key strengths of an industrial robot, as stated above the Kuka robot can lift up to 1300kg. When comparing this to the new UR20 from Universal Robtos with max payload of 20 kg, it is a big difference. 

Installation

This is where the cobot shines, it can be installed in a day. An industrial robot on the other hand has got a significantly higher installation time, taking up to several months.

Short installation time and no down time was a huge advantage for Aegir Brewery when they chose a cobot palletizer

What should you choose?

The facts suggests that there is room for both industrial and collaborative robots (still) in today’s industry. Even though it’s a tied race you’ll see that the cobot is better suited for smaller product lines because of payload limitations, lower costs and less requirements in terms of floor space and fencing.

The industrial robots are more suited to handle faster production lines and heavier payloads, but they also require more resources in the shape of floor space and financial capabilities. The lessons to be learned from this post is to understand that in order to choose between a cobot and a robot you need to know and form an opinion about the key factors: installation, reach, payload and price. Then you should be able to make the right decision for your business.

For further research on cobot vs robot palletizing you can look here.