Connection technology in CNC machines

Andreas Mühlbauer,

CNC quality from Sweden

With CNC machines for the aviation industry, it is important to machine very large parts as quickly and yet precisely as possible. This places high quality demands on the system, which also applies to the entire connection technology. Because only if all components meet the highest standards will this also apply to the entire machine.

Modig builds state-of-the-art CNC special machines and devices for machining large wing components for the aviation industry. © Hanover Fair / Ralf Baumgarten

Huge CNC machines for the aviation industry come from the southern Swedish town of Virserum. They are developed and built by Modig Machine Tool. The connection technology also contributes to their high quality. David Modig has grown up with it. Modig Machine Tool is a family business straight out of a picture book: David's grandfather Harry Modig founded it in 1947 together with his brothers Arne, Sture and Erik Modig. Two other brothers also worked in the company, which at the time was still called Modig Mekaniska Verkstad AB.

After Harry Modig's son Percy took over the management of the company, he often took his offspring David with him to the factory floor. "I've been running around there since I was a little boy," says the junior boss, pointing down into the hall, where there are huge steel parts, each weighing many tons, and machine housings that fill an entire hall. Today, David Modig is 39 years old and is the third generation to manage the company. His father Percy (69) handed over the reins to him in 2011, but is still active in the company.

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The founding generation in Virserum started out with drilling machines and lathes. And the family quickly succeeded in gaining a foothold on the global market. By the fourth year of its existence, the mechanical workshop already counted companies from England, the USA and South Africa among its customers. Today, some 70 years later, Modig Machine Tool enjoys an excellent reputation not only in the aviation industry. The company has branches in 14 countries in Europe, Asia, North America and the Middle East. It employs 60 people worldwide and achieved a turnover of around 400 million Swedish kronor in 2018, which corresponds to approximately 39 million euros.

Faster than the competition

The Swedes are known for the high quality and performance of their ultra-modern CNC special machines and devices for machining large wing parts. This is why machines from Virserum are standard equipment for well-known companies such as Airbus, Boeing, Bombardier and Cessna. This is because they are powerful, fast and yet extremely precise. For example, a RigiMill, the largest and most expensive machine in the portfolio with a price tag of three million dollars, processes meter-sized metal parts 30 percent faster than machines from other manufacturers. "We even guarantee this contractually," emphasizes David Modig.

Not to mention their durability and robustness: Modig machines manufactured in the 1980s are still doing their daily work today - both at the company's headquarters in Virserum and at customers' premises. In some companies where many of the Swedes' machines are in use, it is no longer "a machine", but "a Modig". Incidentally, a RigiMill takes around 2,000 hours of work, and only one of these machines leaves the factory every three weeks.

Ideas, courage and quality

The ingredients of Modig's success are courage, inventiveness and uncompromising quality. Incidentally, the family has courage in its name: "Modig" means "courageous" in German. And the people in charge still stand for inventiveness: The concept for their machines still originates in the minds of Percy and David Modig. The ideas of the two inventors are implemented using state-of-the-art CAD software.

As is usual for Sweden, Modig naturally attaches great importance to supplying customers with only the best quality. And it goes without saying that the high quality standards also apply to the smallest components. Reason enough to source cables and connectors almost exclusively from Lapp Miltronic AB, the Swedish Lapp subsidiary based in Nyköping.

Modig uses the EPIC LS-3 circular connector from Lapp, among others. The power connector is used for power supply and servo drives. © Modig

The annual order volume is several 100,000 euros, and the list of parts that Lapp supplied to Modig in 2018 includes almost 300 items - from the Ölflex control cable to Skintop cable bushings and Epic connectors. There are up to 700 meters of cables in a machine, most of them in energy chains that contain dozens of cables and guide them safely over many meters as the machine moves.

"The broad product range and first-class support are important reasons why we chose Lapp as our supplier for connection systems," says Tony Carlzén, responsible for procurement at Modig. Not forgetting the quality. Modig requires companies that want to be listed as preferred suppliers to be able to demonstrate consistently high quality over many years. In addition, they must always have sufficient stock buffers and a reliable demand forecast in order to be able to deliver products at short notice as soon as they are needed.

Modig has been working with Lapp Miltronic since the early 1990s. Initially, the current Lapp subsidiary only supplied cables. Today, it supplies many other products and complete connection technology solutions. The quality standard has remained the same. This is the most important argument for Modig to retain Lapp as a supplier. However, other aspects are becoming increasingly important. Above all, these are flexibility, delivery reliability and prompt service when required.

The quality of the products is exemplified by the Epic LS-3 circular connector, which is used for power supply and servo drives. Of course, says Tony Carlzén, they also looked at cheaper connectors from other manufacturers, "but none of them met our quality requirements."

Expansion and digitalization

Modig is currently building a new, fully digitalized factory in the conveniently located port city of Kalmar. And it will of course also deliver top quality, David Modig makes clear. The 70-metre-long building with a silver metal façade will house research, final assembly, a customer center and offices on 8,000 square meters. From here, Modig intends to attract customers primarily in heavy industry and the automotive sector on the European continent, not least in Germany. David Modig is already looking forward to the future expansion of the workforce: "In Kalmar, it will also be easier for us to find the staff we need for our expansion plans."

Lapp will also be one of Modig's preferred suppliers at the new location, Tony Carlzén clarifies. "We work together very transparently and have a common goal: to develop ever better and cost-effective technical solutions for our customers in order to remain competitive together."

Bernd Müller, freelance journalist

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