Studer S33+

The S33+ adds a factory-integrated post-process measuring probe system, enhanced automation interfaces (PROFINET), and typically the longer center distance option as a standard configuration. The mechanical platform — Granitan base, turret wheelhead, spindle specs, axis travels — is the same as the S33. The S33+ is essentially a production-automation configuration of the S33 rather than a different machine architecture. If you don't need closed-loop gauging or robot cell integration, the base S33 offers the same grinding capability at lower cost.

After the grinding cycle completes, the CNC program commands a touch-trigger probe (typically Marposs or Renishaw) to measure key workpiece features — diameter at multiple positions, shoulder locations, and taper if applicable. The measured values are compared to nominal, and the StuderGRIND software calculates size corrections for the next workpiece. This closed-loop process eliminates the manual measure-and-adjust cycle, typically reducing cycle-to-cycle size variation by 60–80% and enabling unattended batch production without size drift.

Yes. The S33+ includes PROFINET connectivity for robot I/O communication and is compatible with System 3R and EROWA zero-point clamping systems for repeatable workholding in automated environments. Studer and United Grinding's automation team can provide complete cell integration including robot arm, pallet changer, and parts conveyor. The measuring probe ensures that unattended cycles remain in specification even as grinding wheel wear progresses.

The S33+ grinds the same material range as the standard S33: hardened steels (tool steel, carburized automotive steel, bearing steel), stainless steels, aerospace aluminum alloys, titanium, ceramics, and carbide with appropriate wheel selection. CBN wheels are supported for hardened steel production applications. The measuring probe is particularly valuable for materials with inconsistent stock removal (e.g., titanium or stainless with variable hardness) where size drift per cycle is less predictable.

Used S33+ machines are less common than standard S33 machines, as the measuring probe configuration is a premium option that owners tend to retain. When available, used S33+ machines typically trade at $120,000–$300,000 depending on age, hours, and whether the measuring system is current-generation. Verify probe calibration traceability and request a capability demonstration before purchasing a used machine with integrated gauging.