QMT Features: October 2012
Quality assembly
Mobile measuring device supports the production of electric power generators at DONAKO

We rely on energy for many purposes, and the fact is that natural energy resources are becoming ever scarcer. Renewable energy sources are worth investing in and supporting for the future, this is what DONAKO strives for as a manufacturer of electrical machine sub-assemblies, with world energy industry leaders among its clients. In its aim to produce perfected components and with its future-oriented outlook, DONAKO has decided to put its trust in a mobile measurement solution from Hexagon Metrology – the ROMER Absolute Arm. Now, due to this solution, improved quality of the production process has become a reality.

The company’s hallmark is certainly its long and rich tradition. DONAKO traces its origins to the M-5 Lower Silesian Electrical Machine Production Establishments founded in 1947. The company operating under the current name was established in 1995 as a subsidiary of ABB Dolmel Drives Ltd. DONAKO’s rich experience places it, without a doubt, in a leading position amongst entrepreneurs in the energy sector.

As recently as two years ago, DONAKO was still performing its quality control process using traditional metrological methods. However, in keeping with the spirit of the times and in response to increasingly higher quality demands, it was decided to implement the ROMER Absolute Arm measuring system which has resulted in  a very noticeable increase in production. The ergonomic construction and intuitive operation resulted in the ROMER Absolute Arm immediately gaining the trust of DONAKO employees. “It took less time than expected to adopt this arm for regular service and to reap the associated benefits”, confirms Jacek Zebracki, quality management director at DONAKO.

The ROMER Absolute Arm is used primarily for the measurement of welded assemblies and rotor sheets, the components of electric power generators. The four and a half metre range of the arm also makes the measurement of bulky generator brackets possible, working to a tolerance of ±0.1 mm. Thanks to a leap-frog relocation system provided within the measuring system software, it is possible to measure large elements in many hard-to-reach areas. The arm’s compatibility with metrological software PC-DMIS, ensures that DONAKO employees have no trouble with the inspection of even indirect dimensions, which, before adoption of the arm, was time consuming and costly.

The benefit of the arm’s mobility was confirmed among DONAKO operators taking measurements in several company establishments. This has been achieved thanks to a mobility pack (battery and Wi-Fi module) installed on the arm, as well as by its lightweight technology (carbon fibre).

DONAKO’s quality control process is also supported by another metrology solution from Hexagon Metrology, the Leica Absolute Tracker AT401, making it possible to measure complex surfaces of bulky generator turbines. DONAKO has put its trust in Hexagon Metrology products in the knowledge that, thanks to advanced technology, it is possible to quickly obtain important measurement data wherever traditional methods are impractical or impossible to apply. l

Anna Kulczyk, Hexagon Metrology
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