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History

GMN was founded in 1908 as the mechanical workshop Georg Müller Nürnberg and is now active all over the world. We are constantly reinforcing our traditional reputation as a specialist for challenging products in the field of high-precision and high-speed applications.

1900

1908

  • Georg Müller opens his mechanical workshop
1920

1923

  • Start of ball bearing production (angular ball bearing E5)

 

1928

  • Start of “high-precision ball bearing” production

 

1930

1932

  • Start of production for the patented “tempo grinding spindles”

 

1937

  • Motor-driven grinding spindle with 5 kW motor for a grinding depth of up to 1,000 mm
1950

1952

  • Belt-driven grinding spindle with 105,000 rpm
  • Electric spindle for grinding holes with a grinding depth of 2,000 mm

 

1953

  • First water-cooled HF spindle with up to 30,000 rpm
1960

1963

  • Patent registration freewheel clutch

 

1966

  • Start of production for sprag type freewheel clutches with 4 mm sprag height

 

1967

  • Start of production for sprag type freewheel clutches with 16 mm sprag height
1970

1976

  • Start of production for non-contact labyrinth metal seals

 

1978

  • First HF spindle for automatic tool change

 

1979

  • Start of production for non-contact labyrinth plastic seals
1980

1981

  • High-speed milling with magnetic bearing spindle (25 kW, 30,000 rpm)

 

1982

  • HF spindle with 24,000 rpm for aluminum machining

 

1983

  • High-speed HFS (milling) and HSS (grinding) spindles with oil injection lubrication

 

1985

  • HF spindle with speed factor up to 1.8 mill. mm/min
  • Development of the oil-air lubrication

 

1987

  • Start of production for sprag type freewheel clutches with 8 mm sprag height

 

1988

  • Ball bearing cage made from PEEK for temperatures up to 250 °C and grease lubrication

 

1989

  • Spindle series for internal grinding with oil-air lubrication
  • High-speed HF spindle for machining centers
  • Development and testing of active magnetic-bearing high-speed spindles
1990

1994

  • Spindle series for internal grinding with a speed coefficient up to 2.5 mill. mm/min
  • HF spindle for machining centers with HSK, internal coolant supply, rotary encoder, short acceleration and braking times

 

1997

  • Complete bearing systems for X-ray tubes
2000

2002

  • HF spindle with 80 kW at 16,500 to 30,000 rpm and a removal rate of 8 l/min

 

2003

  • Spindle series for internal grinding with speed coefficient of up to 2.8 mill. mm/min
  • High-performance grinding spindle with 125 kW at 20,000 rpm
  • Small milling spindles for automatic tool change and with encoder-free synchronous motor
  • HF spindle for rotary milling centers with Hirth shaft locking
  • Sealed spindle bearing design for maximum speeds and increased service life

 

2004

  • HF spindle with HSK 25 and 75,000 rpm, internal coolant supply and encoder

 

2005

  • HF spindle with 120 kW at 13,500 to 30,000 rpm and removal rate of > 10 l/min

 

2006

  • Internal grinding spindle with 250,000 rpm and speed coefficient 4.5 mill. mm/min

 

2008

  • Spindle bearing with a hole diameter of 75 to 120 mm

 

2010

2010

  • Spindle bearing with optimized inner ring geometry for maximum speeds with a hole diameter of 75 to 120 mm