With the fever of Automate 2015 two major collaborative robot specific companies have come out with new cobots. These robots are designed for collaborative applications, but they do have different specifications. So, when a market is asking for a specific kind of robot, i.e. more collaborative robots, what is the point of creating two completely different robots? Here are the differences between Universal Robots UR3 and Rethink Robotics Sawyer. Let's look at them.
There really are no clear guidelines for what the robotic market is asking for. However, a couple of points should be considered in order to adapt a robot design to the latest requirements from the industry.
So, in order to meet these requirements, what do UR3 and Sawyer bring to the market that wasn't already there?
As his older brother, Sawyer is using a 7-axes platform. The robot his having a 4 kg payload and a 1,026 mm reach that seems to fit well for industrial uses such as machine tending. With a more compact design than Baxter, it is easier to integrate the robot into a limited space.
The cool thing about this robot is the vision system that monitor the surrounding of the robot but also look where it puts its hand. In fact, with its embedded wrist camera he can have supplementary information on the part it has to grasp. Here is a short list of the specification of Sawyer.
The smallest robot of Universal Robots his keeping the classic UR shape but a little scale down. The arm has 6-axes and has a 3 kg payload (like his name is proposing) the reach is way smaller than Sawyer and this is mainly why they don't have to same usage. In fact, with a smaller reach you want to use this robot for smaller application such as soldering, glue appliance and many others. the robot has less vision and sensors because the company want to keep things simple. Since a lot of applications do not need vision sensors, buying a robot with such sensor would be useless. This way they can lower the price of the robot and offer the same model for everyone without any extra.
So my observations are:
Rethink Robotics had some issues with Baxter and wants to sell a more compact and more rigid robot, but with the same safety features that were working well for Baxter. Easy programming, integrated vision systems and embedded screen to show the status of the robot. All good specifications that were cool to have on Baxter but with a smaller geometry. In fact, since Baxter wasn't able to do machine tending (because it was too big), the new Sawyer is now able to insert its 7-axis arm in a smaller space and with more rigidity and precision. Another cool thing about Sawyer is that its payload to weight ratio is way better than Baxter. So the robot is overall lighter and has a better payload... what more could you ask for?
Yet, the stars were aligned just right for the UR3. In fact, with a very popular UR5 and UR10 platform, they just kept the same recipe and scale it down to do smaller applications. With their UR5 and UR10 being able to support relatively high payloads, they can do machine tending, product testing and other “heavy” applications, but these robots were still quite large for smaller applications. With the increasing demand in electronic manufacturing, it was logical to bring a smaller robot to the market that could perform smaller applications. The safety features of the UR3 robot can be set depending on the environment. The weight of the robot is ridiculously low and can be transported very easily.
So both companies had really good reasons to launch their robots. Either to fill a gap in their product line or to adapt their product to actual applications that the market is interested in. So, they had pretty legit reasons to put out these robots.
Anyways, these are just my observations! In the meantime, look at our updated version of our eBook on Collaborative Robots it includes these 2 fellas. Let us know what you think about the new version, comments are always appreciated.