CNC bending machine for office furniture

The BLM tube bending technology to produce high quality and design office chair

Initial situation

Sedus Stoll AG, established in Germany in 1871, is a leader in office furniture manufacturing. They have written the history of office chairs with their models. There are two production sites today: one in Geseke and one in Dogern, in which 422.3 kilometres are tubes are processed every day to make nearly 2000 chairs. Over the past 15-20 years they have won many awards and their R&D team are always at work to find new innovative solutions.


Ergonomics and eco-friendliness together with quality and design are the columns of the Sedus production philosophy. Combining beautiful design with the needs of the human body is not a simple task: an ergonomic chair must be high-quality but the price - and consequently the cost - must be taken into account.

Also for this reasons Sedus manufactures only in Germany. This guarantees complete control of the entire process in terms of quality but also particular attention to eco-friendliness. Environmental respect does not just mean choosing reusable materials but also clean manufacturing using machinery that is power-efficient.

Since the 1960s and 1970s, steel has become the material of choice for making chairs. Before acquiring BLM machines they used old 2D tube benders 
capable of making just one radius in one bending direction. Production was performed in a succession of process steps and multiple handlings of the same part. This approach was not economically advantageous.


The solution

The first BLM bender arrived in 2005 and today they have three E-TURN40 tube benders and one ELECT40. Sedus makes over a hundred different models with an average of 124,533 bent parts a year. Both the ELECT and the E-TURN are all-electric, multi-radius tube bending machines capable of bending on different planes and capable of fully satisfying the production needs. Today, with BLM machines they can make a pivoting frame model using up to four different bending radii and variable radius tools all in a single working cycle. This approach was previously unimaginable.

The benefits

The machines guarantee production speed and ease of use without sacrificing or accuracy or reliability. The consolidation of process steps provides reduced consumption and consequently cleaner production. This combines important advantages like low maintenance costs and technical assistance.

Technical aspects

All-electric CNC bending machines guarantee maximum accuracy and short cycle times when switching radii.