Used Studer S series Cylindrical Grinding Machines for Sale 41

Advantages of Buying Used Studer S series Cylindrical Grinding Machines

Acquiring a used Studer S cylindrical grinding machine provides precision manufacturers, toolrooms, and production grinding operations with Swiss-engineered cylindrical grinding capability at reduced capital investment compared to new equipment.

Recognized Precision Grinding Reference Brand

Studer's decades-long position as a leading cylindrical grinding machine manufacturer means that used S series machines carry an established technical reputation. Customers across the machine tool, automotive, aerospace, medical, and watchmaking industries have accumulated extensive operational experience with Studer equipment, creating a broad base of programming knowledge, application expertise, and maintenance capability accessible to buyers integrating used Studer machines into existing operations. The brand's market position and the global installed base of approximately 23,000 delivered machines ensure that service support, tooling, and technical documentation remain accessible for used machines across multiple production generations.

Granitan Mineral Casting Machine Bed

The Granitan S103 mineral casting base on which Studer S series machines are built provides vibration damping characteristics superior to conventional cast iron structures, contributing to surface finish and roundness quality during grinding operations. Granitan's thermal stability reduces the thermal error drift that metal machine beds exhibit during production runs as components warm during operation. The material's chemical resistance protects the machine base against coolant degradation over the service life of the machine. Used Studer S machines retain the Granitan base properties throughout their operational life, as the composite material does not degrade in the way that cast iron guideways wear over time.

External and Internal Grinding in a Single Setup

CNC variants in the S series — particularly the S33, S40, and S41 — accommodate both external OD grinding and internal ID grinding from a single machine setup using turret wheelhead configurations with external grinding wheels and high-speed internal grinding spindles. This single-setup capability eliminates part transfers between OD and ID grinding operations, removing the positioning errors that accumulate between separate machines and reducing total cycle time for components requiring both bore and external diameter grinding. Internal grinding spindle speeds of up to 120,000 RPM on equipped S33 configurations enable bore grinding down to small diameters.

CNC Control with Studer Application Software

CNC S series machines use Fanuc control platforms — including Fanuc 21i-TB on earlier S33 production, Fanuc 31i-B on more recent models, and Siemens Sinumerik 840D on select configurations — combined with Studer's application-specific grinding software including StuderPictogramming, StuderWin, and StuderGrind. These software layers provide graphical step-by-step programming interfaces that allow operators to create and edit grinding cycles without manual G-code programming, reducing setup times and operator training requirements compared to general-purpose CNC turning or machining center programming. Used CNC Studer machines with documented control function and intact software installations maintain these programming advantages in production environments.

Swiveling Table for Taper Grinding

Studer S series machines incorporate swiveling worktable designs that enable taper grinding without auxiliary fixtures, simplifying setup for tapered shaft components, conical bearing surfaces, and tapered bore profiles. The S33 table tilts up to 8.5° for high-precision taper grinding. The S41 table accommodates helical and taper grinding with swivel capability suited to the large workpiece sizes the model addresses. Taper grinding flexibility reduces the machine count required in shops producing diverse shaft and spindle geometries with mixed straight and tapered surfaces.

Scalable Workpiece Size Range Across the Series

The S series spans workpiece weight capacities from 20 kg on the S20 to 250 kg on the S41, with distance between centres available from 400 mm through 1,600 mm depending on model and configuration. This range means that buyers can match used Studer equipment precisely to their workpiece size requirements rather than acquiring machine capacity that significantly exceeds or falls short of actual production needs. For operations expanding grinding capacity, the secondary market availability of multiple S series models enables staged investment scaling as production volume grows.

Main Technical Features of Studer S series Machines

Granitan Machine Bed and Guideway System

All current production Studer S machines are built on Granitan S103 mineral casting beds. Guideways on CNC S series machines are coated with Granitan S200, an abrasion-resistant material providing high vibration damping and guideway rigidity. On the S41, Studer's StuderGuide® guideway system uses a combination of hydrostatic and hydrodynamic guide elements providing particularly high rigidity and damping characteristics for demanding precision grinding. The guideway and bed combination defines the long-term accuracy characteristics of the machine.

Wheelhead Configurations

Wheelhead variants across the S series cover a range of grinding applications:

• Fixed wheelhead (S20, S30): External grinding wheel in a fixed position; internal grinding unit available as optional attachment
• Swiveling wheelhead (S20): Manual swivel to 0°, 15°, and 30° for angular plunge grinding
• Turret wheelhead (S33, S40, S41): Multiple wheel positions accommodating external grinding wheel, second external wheel, and internal grinding spindles for complete OD/ID machining in one clamping
• B-axis automatic swivel (S33, S41): CNC-controlled wheelhead swivel enabling precise angular positioning for taper and contour grinding; indexing precision of 1° Hirth coupling on S33, 0.001° continuous B-axis on S41

Workhead and Tailstock

Studer S series workheads use hydrodynamic or roller bearings depending on model and configuration, enabling both grinding between fixed centres for maximum workpiece support rigidity and live spindle grinding for chuck-held workpieces. The S41 offers a direct drive universal workhead with C-axis capability for angular positioning, worm grinding, and form grinding applications. All S series tailstocks feature adjustable centre pressure and fine cylindricity correction adjustment, allowing the operator to compensate for slight cylindricity errors during setup without remounting workpieces.

Axis Travel and Resolution

Verified axis data from manufacturer and secondary market sources across key S series models:

• S20: X-axis 30 mm at up to 2 mm/min, Z-axis 420 mm at up to 3,500 mm/min; spindle power 3 kW; max wheel diameter 350 mm; max wheel width 50 mm
• S30: X-axis 260 mm at up to 6 mm/min, Z-axis 700 mm at up to 5,000 mm/min; spindle power 6 kW; max spindle speed 2,110 RPM
• S33: X-axis 370 mm at up to 15,000 mm/min, Z-axis 500 mm (up to 1,150 mm on longer table configurations) at up to 20,000 mm/min; spindle power 8 kW; resolution 0.0001 mm on both axes; max wheel diameter 508 mm; max wheel width 80 mm; max workpiece weight 150 kg
• S41: X-axis 350 mm, Z-axis 1,750 mm; wheelhead motor power 15 kW; workhead power 10 kW; max workpiece weight 250 kg; distance between centres 1,000 mm / 1,600 mm; centre height 225 mm / 275 mm

Internal Grinding Capability

High-frequency internal grinding spindles available on CNC S series machines enable bore grinding as part of the standard machine cycle without workpiece transfer. On S33 configurations with high-frequency spindles, bore grinding at speeds up to 120,000 RPM is documented, enabling precise grinding of bores down to small diameters. The high-frequency spindle's flat torque curve across the speed range reduces the number of spindles required to cover a bore diameter range, simplifying setup and reducing tooling investment compared to multi-spindle ID grinding configurations.

In-Process Gauging Compatibility

Studer S series machines are designed with expansion interfaces for in-process gauging systems — including Sensitron gauging — which measure workpiece diameter during grinding and feed the size data back to the control for automatic spark-out and size compensation. In-process gauging eliminates the measurement cycles that interrupt grinding programs, reduces scrap from operator measurement errors, and maintains dimensional consistency across production batches. Used S series machines with gauging systems already installed provide this capability without additional investment in gauging equipment and integration.

Common Studer S Series Models

S20 — Conventional Universal for Small Workpieces

The Studer S20 is a conventional universal cylindrical grinding machine for small precision components, with distance between centres of 400 mm or 650 mm, centre height of 100 mm, and maximum workpiece weight of 20 kg. The S20 uses an SPS control unit with automatic grinding cycles for plunge and traverse grinding, rapid infeed, and automatic spark-out. The wheelhead swivels manually to 0°, 15°, and 30° for angular plunge grinding applications. An internal grinding attachment is available as an option, extending the S20's capability to bore grinding in the same clamping as external operations. The S20 targets individual part and small series production in watchmaking, medical devices, electronics, and precision toolroom environments where compact machine footprint and small workpiece focus define requirements.

S30 — Conventional for Medium Workpieces

The Studer S30 addresses medium-sized workpiece production in individual and small batch manufacturing. Distance between centres of 650 mm or 1,000 mm, centre heights of 125 mm, 175 mm, or 225 mm, and maximum workpiece weight of 130 kg accommodate the larger shaft and spindle components beyond S20 capacity. The S30 uses a hydraulic infeed system — a proven approach for plunge and traverse grinding cycles — with automatic cut-out on spark-out completion. The Granitan S103 machine bed is standard. Turret wheelhead with grinding wheel configurations for left, right, and internal grinding attachment provides flexibility within the conventional control architecture. Used S30 machines are widely available on the secondary market and serve as cost-effective cylindrical grinding platforms for toolrooms and job shops with conventional grinding workflows.

S33 — CNC Universal OD/ID

The Studer S33 is the principal CNC universal cylindrical grinder in the S series for small to large workpiece production, with distance between centres of 400 mm, 650 mm, 1,000 mm, or 1,600 mm, centre height of 175 mm, and maximum workpiece weight of 150 kg. CNC control generations across used S33 machines include Fanuc 21i-TB on earlier production and Fanuc 31i-B on more recent machines, with StuderPictogramming or StuderWin software providing graphical programming interfaces. The S33's turret wheelhead accommodates external grinding wheels and high-frequency internal grinding spindles for complete OD/ID machining in a single setup. B-axis Hirth coupling provides 1° indexing repeatability for angular grinding positions. X-axis resolution and Z-axis resolution are 0.0001 mm. Used S33 machines from 2006 onward appear frequently on secondary markets globally, with documented specifications including control type, hours, and accessory configurations.

S40 — CNC Universal for External and Internal

The Studer S40 is a CNC universal cylindrical grinding machine designed for both external and internal grinding, with centre height of 175 mm, distance between centres of 1,000 mm, and table maximum travel of 1,050 mm with maximum swivel of 8.5°. Used S40 machines appear on secondary markets with Fanuc control configurations and document centre height, table travel, and workpiece capacity consistent with the S30/S33 class but reflecting a different production generation. The S40 serves production grinding applications in automotive and industrial manufacturing where CNC cylindrical grinding of shaft components and bearing surfaces defines the primary use case.

S41 — CNC Universal for Large Workpieces

The Studer S41 is the large-capacity CNC universal cylindrical grinding machine in the current S series, with distances between centres of 1,000 mm or 1,600 mm, centre heights of 225 mm or 275 mm, and maximum workpiece weight of 250 kg. The S41 incorporates StuderGuide® hydrostatic/hydrodynamic guideway system, linear motor axis drives for the highest dynamic stiffness, and direct drive B-axis with 0.001° resolution for continuous angular positioning. Wheelhead motor power is 15 kW, workhead motor power is 10 kW, and total installed power is approximately 30 kW. The S41 floor space is approximately 5,200 × 3,800 mm and machine weight approximately 10,200 kg. Used S41 machines from 2013 onward appear on secondary markets with documented specifications. The S41 serves aerospace component manufacturing, large spindle and shaft production, hydraulic component grinding, and industrial drive component manufacturing where large workpiece mass and high precision are simultaneously required.

Industries and Applications

Studer S cylindrical grinding machines serve precision manufacturing sectors where external and internal cylindrical grinding to tight tolerances defines component quality.

Automotive Manufacturing

Automotive OEMs and tier suppliers use Studer S machines for grinding camshafts, crankshafts, transmission shafts, gear shafts, injection system components, and bearing surfaces where cylindricity, roundness, and surface finish tolerances determine functional performance. The S33's single-setup OD/ID capability is particularly relevant for automotive components requiring both bore and external diameter grinding to closely correlated dimensional specifications. High-volume automotive grinding applications benefit from in-process gauging integration enabling automatic size correction and consistent dimensional output across production batches.

Aerospace Component Manufacturing

Aerospace manufacturers grind turbine shaft sections, landing gear components, hydraulic actuator rods, and structural fasteners on Studer S machines where material certifications, traceability, and tight geometric tolerances define quality requirements. Titanium, nickel alloys, and high-strength steels common in aerospace applications are ground effectively on S series machines. The S41's large workpiece capacity serves the larger aerospace shaft components and structural elements that exceed S33 capacity. In-process gauging supports the statistical process documentation requirements of aerospace quality management systems.

Medical Device Manufacturing

Medical device manufacturers use S20 and S33 machines for grinding implant components, surgical instrument shafts, and precision medical hardware where surface finish, roundness, and dimensional accuracy affect both device function and biocompatibility. The S20's focus on small workpieces serves the micro-scale precision requirements of dental implants, bone fixation components, and minimally invasive device hardware. Medical grinding applications frequently require clean-room compatible coolant systems and chip containment provisions, both of which can be integrated into S series machine installations.

Toolroom and Die Manufacturing

Toolrooms use Studer S machines for grinding tool shanks, punch and die components, guide pins, and precision tooling elements where grinding accuracy defines tool performance and service life. The S30 and S33 serve toolroom environments with conventional and CNC grinding capability respectively. The S20 addresses the small precision tooling work — drill grinding, reamer preparation, gauge pin finishing — where compact machine size suits the small workpiece dimensions involved. Toolroom applications typically involve diverse component geometries from different jobs, making the S series universal configuration particularly suited to the varied part portfolio of precision toolroom work.

Pneumatics and Hydraulics

Manufacturers of hydraulic cylinders, pneumatic actuators, control valves, and pump components use S series machines for grinding cylinder bores, piston rod external diameters, valve spindle surfaces, and pump shaft bearing surfaces where sealing clearance tolerances require precise OD and ID grinding. Single-setup OD/ID grinding capability on CNC S series models supports the bore and external diameter grinding required in a single part setup for hydraulic components where concentricity between bore and external features is functionally critical.

Watchmaking and Precision Instruments

Swiss watchmakers and precision instrument manufacturers use Studer S20 machines for grinding watch components, instrument shafts, and micro-mechanical parts where dimensions measured in microns define part function. The S20's compact workpiece capacity and high-precision grinding capability suit the requirements of horological manufacturing where component dimensions, surface finish, and roundness must meet the exacting standards of watchmaking quality systems. Studer's Swiss manufacturing origin and long relationship with the watchmaking industry underpin the brand's strong position in this segment.

Power Generation and Energy Equipment

Turbine manufacturers, generator producers, and energy equipment suppliers grind large shaft sections, bearing journals, and rotor components on S41 class machines where large workpiece weight and long distance between centres accommodate the component dimensions of rotating machinery in power generation equipment. Replacement component grinding for existing turbine and generator fleets requires the large-capacity precision grinding that the S41 provides, making used S41 machines a resource for maintenance and overhaul facilities serving power generation installations.

Pricing Factors for Used Studer S series Machines

Multiple variables influence the secondary market value of used Studer S cylindrical grinding machines. Understanding these factors helps buyers assess whether available equipment represents appropriate value for their specific grinding requirements.

Model and Workpiece Capacity

The S series spans from the compact conventional S20 through the large-capacity CNC S41, with each model addressing a distinct workpiece size range. Secondary market valuations reflect the capacity difference between models, with larger-capacity and more feature-rich CNC configurations generally commanding higher valuations than smaller conventional models. Within each model category, the specific distance between centres configuration (400 mm through 1,600 mm) affects both workpiece capability and market positioning.

Conventional Versus CNC Configuration

Conventional S20 and S30 machines represent lower investment than CNC S33 and S41 models, reflecting their more limited automation and programming capability. The step up to CNC — with full-axis servo drives, StuderWin or StuderPictogramming software, and automatic cycle execution — provides production capability and programming flexibility that buyers with volume grinding requirements or complex grinding programs should evaluate against acquisition cost differences. Conventional machines serve individual part and small series production effectively at lower capital cost, while CNC machines justify their higher secondary market valuations through production efficiency and programming capability in appropriate applications.

Control Generation and Software Version

CNC S series machine valuations are influenced by the Fanuc or Siemens control generation and the version of Studer application software installed. Machines with later control generations offer improved connectivity, updated cycle capabilities, and longer expected component support life. Buyers should confirm that the control system on any target machine supports their required grinding cycles, NC programming approach, and any integration requirements for DNC networking or production monitoring systems.

Accumulated Hours and Maintenance History

Grinding spindle hours, total power-on time, and documented maintenance history provide the primary objective indicators of machine condition and remaining service life. Buyers should request spindle hour counter data and available maintenance records before evaluating specific machines. Complete maintenance documentation demonstrating regular spindle bearing inspection, guideway lubrication, and coolant system service supports buyer confidence and influences seller pricing positions relative to undocumented machines in otherwise similar condition.

Included Accessories and Grinding Equipment

In-process gauging systems, additional internal grinding spindles (particularly high-frequency spindles for small bore diameters), dressing units, additional grinding wheels, workholding fixtures, and steadyrests represent significant accessory value in used Studer packages. Machines offered as complete production-ready installations with calibrated gauging, documented spindles, and relevant fixtures are preferable to bare machines requiring separate accessory sourcing. Complete packages also allow buyers to assess total operational readiness more accurately than bare machine acquisitions.

How to Select the Right Studer S Machine

Define Workpiece Size and Weight Range

Establish the maximum diameter, maximum length between centres, and maximum workpiece weight across your anticipated production program before evaluating specific S series models. Workpiece weight determines whether S20, S30, S33, or S41 class machines are appropriate. Distance between centres determines whether 400 mm, 650 mm, 1,000 mm, or 1,600 mm configurations serve your longest required workpiece. Confirm that the target machine's capacity accommodates your largest workpieces with adequate margin rather than at the extreme limits of machine specification.

Determine External-Only Versus Combined OD/ID Requirements

Clarify whether your production program requires only external OD grinding or combined external and internal grinding on the same components. Pure OD grinding applications can be served by external-only wheelhead configurations at lower complexity and cost. Applications requiring both bore and external diameter grinding on the same components benefit significantly from single-setup OD/ID capability available on CNC S series machines with turret wheelheads and internal grinding spindle attachments. Mapping your component grinding requirements to machine capability before acquisition prevents purchasing insufficient capability or paying premiums for unused features.

Assess CNC Versus Conventional Requirements

Evaluate your production volumes, part variety, and programming requirements against the conventional versus CNC options in the S series. Conventional S20 and S30 machines serve individual part and small series production cost-effectively with simpler operation and maintenance. CNC S33 and S41 machines serve higher-volume production, complex multi-step grinding programs, and applications where cycle time reduction through automated infeed, gauging feedback, and automatic spark-out justifies CNC capability investment. If your production consists primarily of single parts or very small series with frequent geometry changes, the simpler setup of conventional machines may be preferred over CNC complexity.

Verify Control Compatibility and Software Integrity

For CNC S series machines, confirm that the Fanuc or Siemens control is fully functional and that Studer application software — StuderPictogramming, StuderWin, or StuderGrind — is installed and operational before purchase commitment. Request a demonstration of program creation, cycle execution, and dressing operation on the machine under evaluation. Verify that the software version installed supports your required grinding cycles and that CAM post-processor output is compatible with the installed control if your programming workflow uses offline programming software.

Arrange Inspection Including Spindle and Guideway Assessment

Engage a qualified grinding machine technician to perform physical inspection including grinding spindle bearing runout measurement, internal grinding spindle condition assessment, guideway condition evaluation, axis positioning accuracy verification through ballbar or circular interpolation testing if applicable, and Granitan machine bed condition inspection. In-process gauging calibration should be verified on machines offered with gauging systems. Request any available spindle bearing inspection records, prior service reports, and the results of previous accuracy checks. Physical inspection findings should inform acquisition decisions and pricing negotiations based on actual machine condition.

Buy Used Studer S series Cylindrical Grinding Machines on Exapro

Explore the current selection of used Studer S cylindrical grinding machines available on Exapro and connect directly with verified sellers offering equipment for precision cylindrical grinding in automotive, aerospace, medical device, toolroom, and high-precision manufacturing applications. Access detailed machine specifications, review documented control configurations and included accessories, and contact sellers to discuss technical requirements and logistics for your next precision grinding investment.