Universal Cylindrical Grinder - United Grinding Technologies Inc.


United Grinding Technologies (UGT) announces the new Studer S41 CNC universal cylindrical grinder, featuring outstanding technology and cost-effectiveness. The machine grinds with superior precision and at extreme metal removal rates.  In addition, the longitudinal and cross slide, as well as the swivel axis for the wheelhead, feature electric direct drives, which move to the working position swiftly and precisely.

Higher precision, better surface quality, higher metal removal rates – these are the demands of today’s market.  In addressing these requirements, Studer has again raised the bar with its new S41 CNC universal cylindrical grinder.  The developers based the new grinder on a predecessor machine proven worldwide over many years, while adding a number of outstanding design features.  It offers a broader range of applications with production options that are highly attractive from any perspective. By saving on auxiliary times, the S41considerably shortens the cycle times of the grinding process.  

Extremely rigid machine bed and maintenance-free guide system
The Granitan® S103 machine bed provides a very solid, rigid and thermally stable machine ideal for absorbing the high forces that occur during grinding with high metal removal rates.  
    Its remarkable thermal behavior allows the machine to operate with consistently high precision even with changing ambient temperatures.  Its high rigidity and excellent damping provide the basic prerequisites for outstanding surface quality of ground parts and long grinding wheel lifetimes.  
    The new StuderGuide® guideway system ensures high precision of the longitudinal and cross slides when both stationary and during movement. The StuderGuide® system uses the advantages of hydrostatic and hydrodynamic guide systems and avoids the slip-stick effect or floating of the slide. Also contributing to the machine's high precision is the fact that the solid gray cast iron longitudinal and cross slides rest completely on the guideways over the entire travel.  With this maintenance-free guide system, Studer guarantees a straightness of < 0.0001” over a measured length of 37.4”.

Electric direct drives increase speed and precision
The longitudinal slide (Z-axis) has a ground work table which carries the workhead and tailstock as well as additional accessories and devices.  Longitudinal and cross slides are moved by linear direct drives and, with up to 66 ft per minute, achieve four times higher travel speeds and axis system resolutions of ten nanometers.  This enables high-precision and highly efficient grinding, as well as making a huge contribution to reducing auxiliary times.
    The swivel movement of the turret wheelhead (B-axis) is also powered by a direct drive. It swivels the turret wheelhead around three times faster and positions the new grinding wheels in a much shorter time with a positioning resolution of 0.00005 deg. The positioning is therefore twice as precise as with the predecessor machine.  The elimination of the Hirth gear, which fixed the wheelhead in position on the predecessor machine, also contributes to faster positioning.

Machine variants expand market potential for users
The S41 also has a number of advantageous characteristics which enable the user to cover an extended workpiece range, and thus a broader market range.  This includes greater heights of centers and distances between centers, allowing workpieces with weights of up to 551 lb. to be machined. Up to four external grinding wheels or three internal grinding spindles enable over 30 grinding head combinations.  The grinding wheels are now driven by motor spindles rather than belt drives; the machine can be equipped with motor spindles for high speed grinding (HSG); internal grinding spindles with speeds from 6000 to 120,000 rpm can be used; and automatic balancing systems and frequency converters for each external grinding spindle allow grinding processes to be matched to the respective conditions of use.  Wheelhead variants are also available with a vertical spindle for grinding keyways or with a traverse grinding axis for traverse grinding of internal tapers.

Simple operation and integration into complete manufacturing processes
Fatigue-free working and straightforward machine operation are important components for consistently high quality. For this reason, optimized ergonomics were one of the developers' priorities.  For instance, hoses and cables have largely disappeared from the work area of the machine. Grinding wheel change is performed with a single Allen wrench, and a special small crane is integrated into the machine, so that heavier grinding wheels do not have to be lifted manually.


  • superior precision
  • extreme metal removal rates
  • rigid machine bed
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