The S121 radius internal cylindrical grinding machine has an exceptional price/performance ratio and is the ideal machine for internal, face and external grinding of chuck components. It has a host of sophisticated technical features such as the revolutionary StuderGuide ® guideway system, high-precision axis drives with linear motors, a fully automatic B-axis with direct drive, etc.

The S121r is especially suitable for grinding complex workpieces from very hard materials such as tungsten carbide, ceramic and sapphire as well as for general grinding tasks. Optimal stability and rigidity enable diameters, cones and transitional radii (ground using the pendulum method through interpolation of the B and X/Z axes) to be ground to a polished surface quality. The machines are ideal for the manufacture of dies, especially in the packaging industry, where tungsten carbide and ceramic are primarily processed. Hydraulic components such as axial pump pistons, guide plates and housings made of hardened steel, cast iron and copper can also be produced. Other fields are the production of complex workpieces with several tapers greater than 20 to 90 deg in a single clamping, where the main applications are in the watch and medical industries with extra-hard materials such as industrial ceramic, sapphire and tungsten carbide, as well as the manufacture of human implants for shoulders, knees and hips from ceramic and titanium.


  • It can be configured for any imaginable internal grinding task
  • High flexibility
  • Compact with excellent accessibility to the inside of the machine from three or four sides (for maintenance and service)
  • Short set-up and changeover times thanks to well thought-through set-up philosophy


  • Swing diameter over table 300 mm
  • Maximum workpiece weight 100 kg
  • Granitan® S103
  • StuderGuide® guide system with linear drive
  • Fully automatic B-axis with direct drive with a swiveling range of -20 to +91 deg
  • Spindle turret with two grinding spindles or one fixed spindle or two spindles in parallel
  • C-axis for the workhead enabling form and thread grinding
  • Full enclosure with two sliding doors
  • Simple to use and program thanks to HMI StuderSim
  • StuderSIM programming and simulation software for the creation and simulation of grinding and dressing programs on the machine control or on an external PC
  • Standardized interfaces for loader and peripheral devices