|1934||Founded by Paul Kehren, dealer for alloyed steel and subcontracor for “Deutsche Bahn” – railway Company|
|1949||Development and manufacturing of rotary table grinding machines|
|1963||After the death of the founder, the company is taken over by his son Helmut Kehren|
|1980||KEHREN equips the first grinder with CNC-control (Siemens Primo SG).|
|1989||The vertical grinding machine “Ri” with rotary table is developed and delivered one year later.|
|1993||Helmut Kehren dies, the company is taken over by Dr. Neumann and by Richard Krämer, who becomes sole executive director. |
Reorganizing and downsizing the vertical range of manufacture allows the workforce to be reduced from 98 to 54 employees.
|1996||Development of the backlash-free direct drive of a rotary table, for grinding curves and serrations for example. |
The first machine is delivered to INDEX in 1997.
|2001||Presentation of the first Ri grinder with Y-Axis in the side support|
|2002||Ulrich Krämer is appointed technical director, Bruno Mies becomes commercial director|
|2003||Development and presentation of the grinding machine in portal design|
|2004||Presentation of a Y-axis in the grinding head, for serration grinding|
|2005||Enlargement fo the Ri series by the Ri 4 and Ri 5 model|
|2006||Presentation of the Ri 8-4 grindturn model in slant bed design and enhanced ergonomics|
|2008||Development of a new hydrostatic table bearing with fewer components, with improved stiffness, improved true running and better damping properties. |
Implementation of hard turning and hard milling into the machining process
|2009||75th anniversary of the company founding|
|2011||Development of a new drive concept for the x-axis, hydrostatics in combination with a direct drive.|
|2012||Development and manufacturing of KEHREN grinding spindles for all KEHREN products|
|2013||Inauguration of a new assembly shop|
|2014||Development of a new, compact grinding centre in portal design for machining 5 faces of a work piece in one clamping|
Until today, KEHREN is in private hands.