GMN Paul Müller Industrie GmbH & Co. KG Äußere Bayreuther Str. 230 · D-90411 Nürnberg High precision ball bearings Special applications

Contents: About Us Pages 4-5 The Company GMN Pages 6-7 Process of Innovation Pages 8-9 Touchdown Bearings Pages 10-11 Vacuum Technology Pages 12-13 Medical Technology/X-Ray Pages 14-15 Bearing Systems Pages 16-17 Measurement and Navigation Technology Pages 18-19 Machine Tool Applications High Precision Ball Bearings Pages 20-21 Standard Program Manufacturing Technologies Pages 22-23 Sample Production and Precision Machining Pages 24-25 From Measurement to Assembly Pages 26-27 PVD Coating

The Company Precision as tradition Leonardo da Vinci himself invented the principle of the ball bearing. Would he ever have imagined the maximum speeds, ball bearings could reach in the 21st century and the loads they would have to withstand? From the beginning, GMN has specialized in products for high precision and high speed applications. GMN was founded in 1908 as the mechanical workshop Georg Müller Nürnberg and was one of the first companies to start serial production of high precision bearings in 1928. Today, we export world-wide and do continuously step up to our traditional reputation...

Innovation as driving force Around 450 employees at GMN represent an invaluable source of experience in successful solutions for machine tool applications, vacuum technology, measurement technology, medical technology and motion technology. In-house development work plus cooperation with universities, as well as international research projects on spindle technology, material science and tribology ensure our orientation to the future. The ability to recognize synergies and to use them is an important reason for our long-term and close customer relations. We are continuously working on economical...

The Process of Innovation Consultation comes first As soon as standard bearings do not fulfill any longer the required specification regarding geometry, precision, material as well as tribological and application-specific requirements, special bearings are requested. Especially for the application in our customers‘ innovative products, we often develop pre-finished bearing systems up to the start of serial production. The application engineers of our high precision ball bearings division provide support and advice regarding all questions and problems right from the start, as even small changes...

Production makes the difference GMN philosophy of producing prototypes under series conditions is a key element. Up to the start of series production, GMN coordinates the entire process of production by itself, as our vertical range of manufacturing exceeds the requirements of the production of special ball bearings by far. It is almost unique for a ball bearing supplier of our size to have our own PVD coating system. The precision measuring division, precision metal machining and assembly are specifically geared to the production of sophisticated high precision bearings and bearing systems....

Touchdown Bearings The use of magnetic bearings gets more and more important for CO2 laser systems, liquid pumps as well as in the optical industry. GMN has successfully been promoting the development and production of touchdown bearings since the mid-nineties. Optimized engineering The design of the touchdown bearing arrangement has a major influence on the dynamic behaviour of the shaft during emergency operation. Triple bearing systems (one pair of spindle bearings with a deep groove ball bearing) or quadruple bearing systems (two pairs of spindle bearings) can be implemented. Important performance...

Low-cost solutions • Speed coefficient: • Mass of rotating parts: • Atmosphere: • Bearing design: • Ring material: • Ball material: • Lubrication: 2.2 x 106 mm/min < 1.5 kg Fore-vacuum Series 618 / full complement 100Cr6 100Cr6 Ball coating and oil High-end solutions • Speed coefficient: • Mass of rotating parts: • Atmosphere: • Bearing design: • Ring material: • Ball material: • Lubrication: 2.2 x 106 mm/min < 3.5 kg Aggressive gases Series 618 / full complement HNS (High Nitrogen Steel) Silicon nitride (Si3N4) Oil

Vacuum Technology In close cooperation with industrial partners, GMN develops overall concepts for complex bearing systems, especially for turbo molecular pumps (TMP). Optimized engineering For turbo molecular pumps GMN develops custom made high precision ball bearings with special dimensions, designs and cages. Important performance criteria: • Product-optimized bearing design • Use of shielded bearings for protection from contamination and to increase life • Ceramic balls for higher speeds, minimum friction and optimized bearing dynamics • Total tribology concept (lubrication, preservation,...

Spindle bearings for TMP • Open or shielded • Silicon nitride balls (Si3N4) • Vacuum up to 10"3 mbar • Speed coefficient up to 1.1 x 106mm/min • Service life > 30,000 h • Cages: Oil-impregnated textile reinforced phenolic resin cage or TXM cage • Special design (dimensions, internal design, cage) • Optimized grease reservoir Deep groove bearings for TMP • Open or shielded • Silicon nitride balls (Si3N4) • Vacuum up to 10"3 mbar • Speed coefficient up to 0.8 x 106mm/min • Oil lubrication • Service life > 30,000 h • Special design (dimensions, internal design, cage)

Medical Technology / X-Ray Based on bearings and bearing units for more than 100,000 X-ray tube systems – amongst them one of the first tubes world-wide which enabled X-rays of the heart – GMN has been an innovative and reliable partner to medical technology for decades. Optimized engineering GMN coats components such as bearing rings, sliding fits and balls on its own PVD sputter system. Ball coatings in lead or silver with a thickness of nanometers (10-9 m) have resulted from various research projects and are the basis for the low-noise, low-vibration, particle-free GMN bearing systems which...