Introduction and History of the LBR iiwa Cobots
KUKA first publicly presented the LBR iiwa at Hannover Messe in 2013. Its name reflects its purpose: LBR stands for Leichtbauroboter, German for lightweight robot, while iiwa stands for intelligent industrial work assistant. KUKA describes it as the world's first series-produced sensitive robot suitable for direct human-robot collaboration.
Its introduction marked an important step in the development of collaborative robotics. Rather than relying only on positional control, the LBR iiwa incorporates torque sensing throughout all seven joints, allowing it to detect physical interaction and control forces during a task. KUKA's 2013 annual report states that market introduction was underway during that year, and by early 2014 the robot was being qualified for series production and had been installed as a standard product at several automotive customers.
Today, the LBR iiwa remains part of KUKA's cobot portfolio and is available in two main payload classes: 7 kg and 14 kg.
Applications and Use Cases of LBR iiwa Cobots
The LBR iiwa is particularly well suited to tasks where sensitivity, controlled contact and flexibility are more important than simply moving as quickly as possible. KUKA highlights assembly as one of its core strengths, especially applications involving delicate components or parts that need to be fitted, inserted or positioned using controlled forces. Its force-control capability allows the robot to detect contours and locate the correct installation position rather than relying entirely on precisely predetermined coordinates.
KUKA also lists handling, mechanical machining and polishing, applying materials such as adhesives or coatings, packaging and palletizing, and measuring and inspection among its application areas. Real-world KUKA deployments have included applications such as precision screw fastening and sensitive component assembly.
Its seven-axis configuration is also useful where the robot needs additional freedom of movement to reach around equipment, components or human coworkers. This makes the LBR iiwa particularly interesting for collaborative workstations and automation cells where space or access can be challenging.
What Makes LBR iiwa Cobots Special
The defining characteristic of the LBR iiwa is its sensitivity. Integrated joint torque sensors in every axis allow it to detect contact and measure forces acting on the robot. KUKA states that when contact is detected, the robot can react by reducing force and speed. Its position and compliance control also allow it to interact with components in a controlled manner rather than behaving only as a rigid positioning machine.
The seven-axis architecture is another important distinction. Most articulated industrial robots and many cobots use six axes, while the LBR iiwa has seven. This additional degree of freedom gives the robot greater flexibility in choosing its posture while positioning its end effector, which can be valuable in confined or complex workspaces.
The robot also supports several control approaches. In addition to conventional position-controlled motion, KUKA provides gravity-compensation and compliance-control capabilities. This allows the LBR iiwa to be manually moved more easily or configured to respond compliantly when forces are applied. Its Sunrise control system integrates robot control, safety, sensor processing and application programming, with Sunrise.Workbench supporting Java-based robot applications.
Models Within the KUKA LBR iiwa Family
Model: LBR iiwa 7 R800
Rated Payload: 7 kg | Reach: 800 mm | Number of Axes: 7 | Pose Repeatability: ±0.10 mm | Robot Weight: Approx. 23.9 kg | IP Rating: IP54 | Mounting: Floor, Ceiling, Wall
Best suited for: Sensitive assembly, light handling, inspection, precision insertion and other collaborative or force-controlled applications.
Model: LBR iiwa 14 R820
Rated Payload: 14 kg | Reach: 820 mm | Number of Axes: 7 | Pose Repeatability: ±0.15 mm | Robot Weight: Approx. 29.9 kg | IP Rating: IP54 | Mounting: Floor, Ceiling, Wall
Best suited for: Similar sensitive and collaborative applications where greater payload capacity is required.
KUKA also offers LBR iiwa 7 R800 CR and LBR iiwa 14 R820 CR cleanroom variants. The current KUKA product page lists these cleanroom versions with floor mounting.
LBR iiwa vs LBR iisy
KUKA's LBR iiwa and LBR iisy serve somewhat different parts of the collaborative robotics market. The LBR iiwa is the older and more specialised sensitive robot platform. It uses seven axes, offers 7 kg and 14 kg payload versions with relatively short 800–820 mm reaches, and is controlled using the KUKA Sunrise platform. Its major strengths are sensitive manipulation, force control, compliance and complex assembly tasks. KUKA itself describes the iiwa as specialising in delicate assembly work.
The newer LBR iisy uses a more conventional six-axis architecture but offers a substantially broader choice of sizes, with rated payloads from 3 to 15 kg and reaches from 760 to 1,300 mm. It runs KUKA's newer iiQKA.OS2 platform and is positioned as an “Industrial Performance Cobot,” with a strong focus on intuitive programming, rapid commissioning, industrial integration and applications ranging from machine tending and material handling to packaging, palletizing, inspection and welding.
In practical terms, the LBR iiwa stands out when seven-axis dexterity and highly sensitive force-controlled interaction are especially important, while the LBR iisy provides the newer, broader and more scalable KUKA cobot platform for general industrial automation. The two therefore overlap in some applications but are not simply different sizes of the same robot family.
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