Q&A: How Universal Robots Developed the UR20, a New 20kg Industrial Cobot

MMS: What is the significance of offering a 20kg cobot and how will it impact your customers?

AB: We're very proud to launch a 20 kg cobot with 1,750mm of reach. To create a robot that delivers performance and reliability while fitting into human-scale tasks in the work environment has been important for us to get right. We had to redesign a lot of parts because our mechanical design has been around for quite a while, and the demands that this cobot put on the drive train we had been using created new challenges. We really wanted to make sure that we ironed out all of the functionality and make a mechanically superior product compared to where we came from.

In upgrading the drive train, we wanted to bring both a boost in uptime and reliability but also give a product that is really capable of sustaining a heavy load.

MMS: What was the need that Universal Robots identified here? What were the projected applications that drove the project?

AB: I think there's a lot of tasks out there that need this kind of work. Of course, there's packaging, palletizing and other situations where people carry boxes and stack them up high. It is common to see people in this industry moving 10 tons of material a day. Over a lifetime, that's not what we want for our workers. A lightweight robot capable of carrying that kind of weight will change people’s lives.

Having that work done by cobots enables people to stop doing that kind of work, but we’ll also see this cobot in other places like welding and machine tending. These cobots will support machine tools like lathes and CNCs because of the ability to reach further into machines and situations where heavy parts are now within its capacity. And because the whole installation has become a thing that is possible for most professionals, you don't need a lot of different stakeholders to be involved with the programming.

MMS: What kind of engineering upgrades made the UR20 possible?

We had to re-imagine the whole drive train. If you look at the base joint of the UR20, it produces a bit more than 700 Newton meters of force, so the torque it produces is huge but the repeatability at the end of the arm is still 50 microns. We had to work closely with our key vendors and we really thought through the whole mechanical design and simplified the process. We put our attention toward critical aspects of the cobot, especially with the rigidity of the system.

See the UR20 in action in this video by Universal Robots: