Freedom for articulated arm robots


The 7th axis from Treotham extends the working space by up to 400 percent and is now compatible with all lightweight articulated arm robots worldwide due to a simple Plug & Play kit. Models from Universal Robots, Epson and the igus robolink series from Treotham have benefited from this increased mobility. 

The first users of the so-called 7th axis, a linear axis with an electric toothed belt drive that igus launched in 2020, were thrilled 

According to igus head of automation technology Alexander Mühlens: “Suddenly, thanks to the additional axis, our clients' articulated arm robots are as mobile as humans. This enables them to take on multiple tasks in automation environments making them significantly more productive. We therefore decided to extend the compatibility of the system to all manufacturers worldwide – such as Omron, Franka Emika, Doosan and Yuanda Robotics. With a matching Plug & Play kit of hardware and software we make customisation possible.”


In the future, all lightweight articulated arm robots with a weight range of 10 to 50 kilograms or, depending on the dynamics, a payload of 2 to 20 kilograms can use the 7th axis, according to Treotham. It supplies the system as a ready-to-connect complete solution from a single source. It consists of a drylin ZLW toothed belt axis with a length of up to six metres and two parallel rails made of aluminium. These can be mounted on the floor, walls or ceilings and a toothed belt drive with stepper motor for a positioning accuracy of 0.3 millimetres.
Also included is: an energy chain for guiding energy and data cables; a switch cabinet integration kit with cables; motor control system and the respective software solution, as well as a carriage with the adapter plate that is adapted to the geometry of thousands of articulated arm robots. All components are perfectly matched, so that users can quickly put the system into operation and benefit from the new mobility without expensive design and tuning work.

Save operating costs

Users save time and money not only in planning and purchasing the 7th axis, but also in operation. All made possible because the system works maintenance-free. The reason: the carriages move on the aluminium rails with the help of drylin linear technology. The high-performance plastic of the bearings enables low-friction and maintenance-free dry operation. The absence of lubricants also makes the system hygienic. The stainless steel version with FDA-compliant components makes the linear guide ideally suited for sectors such as linear guide ideally suited for sectors such as the food industry.