Studer S41
Key Specifications
Weight
Spindle Power
Accuracy
center height
distance between centers
max workpiece weight
Overview
The Studer S41 is the large-workpiece universal cylindrical grinding machine in Studer's lineup, built for shops that need to grind heavy, long parts with Swiss-level precision. It handles workpieces up to 250 kg (550 lb) between centers, with configurable center heights of 225 mm (8.8 in) or 275 mm (10.8 in) and distances between centers of 1,000 mm (40 in) or 1,600 mm (63 in). That flexibility means it covers everything from large hydraulic cylinders to aerospace shafts.
The machine rides on Studer's proprietary StuderGuide guideway system, a combination of hydrodynamic and hydrostatic principles that delivers both high damping and zero stick-slip. Axis drives use linear motors for direct, backlash-free positioning, which eliminates the mechanical wear and periodic adjustment that ballscrew-driven machines require. The B-axis uses an extremely fast direct drive for wheel head swiveling, allowing rapid changeover between external, internal, and angular grinding setups.
The grinding wheel spindle takes wheels up to 500 mm (20 in) diameter and 100 mm (3.9 in) wide, with a maximum speed of 4,500 RPM and 15 kW of spindle power. The wheel head can be configured with up to four grinding spindles (two external, two internal), and Quick-Set software reduces changeover time to under 60 seconds. Studer's integrated high-frequency internal grinding spindles run up to 120,000 RPM for precision bore work.
The control is Fanuc-based with StuderPictogramming, Studer's graphical programming interface that lets operators set up grinding cycles from pictograms rather than writing G-code. StuderTechnology software automatically calculates optimal feed rates, speeds, and spark-out times based on workpiece material, grinding wheel type, and required surface finish.
The S41 weighs approximately 8,600 kg (19,000 lb). New machines typically price in the $350,000-$550,000 range depending on spindle configuration and automation options, though fully loaded versions with robot loading can exceed $600,000. Used units from 2013-2020 appear in the $120,000-$250,000 range. Positioning accuracy is within 0.001 mm, and surface finishes down to Ra 0.1 um are achievable. Specs sourced from Studer published data, United Grinding brochures, TechSpex listings, and verified used-equipment dealers.
Full Specifications
| Parameter | Value |
|---|---|
| Center Height | 225 mm (8.8 in) / 275 mm (10.8 in) |
| Distance Between Centers | 1,000 mm (40 in) / 1,600 mm (63 in) |
| Max Workpiece Weight | 250 kg (550 lb) |
| Max Grinding Wheel Diameter | 500 mm (20 in) |
| Max Grinding Wheel Width | 100 mm (3.9 in) |
| Wheel Speed | 4,500 RPM max |
| Spindle Motor Power | 15 kW |
| Guideway System | StuderGuide (hydrodynamic/hydrostatic) |
| Axis Drives | Linear motors (X, Z) |
| B Axis | Direct drive (high-speed swivel) |
| Max Spindle Configurations | Up to 4 spindles (2 external, 2 internal) |
| Internal Grinding Spindle Speed | Up to 120,000 RPM |
| Positioning Accuracy | 0.001 mm |
| Best Surface Finish | Ra 0.1 um |
| Machine Weight | 8,600 kg (19,000 lb) |
| CNC Control | Fanuc with StuderPictogramming |
| From | To |
| Newark New York | Las Vegas (LAS) |
| San Francisco | Newark/New York (EWR) |
| Los Angeles | Newark/New York (EWR) |
Strengths & Limitations
Strengths
- StuderGuide guideway system combines hydrodynamic and hydrostatic principles for exceptional damping and zero stick-slip, delivering surface finishes that ballscrew machines struggle to match
- Linear motor axis drives eliminate backlash and mechanical wear, maintaining accuracy over years of production use without periodic adjustment
- Configurable with up to four grinding spindles (two external, two internal) and Quick-Set changeover in under 60 seconds, reducing setup time on complex parts
- 275 mm center height and 1,600 mm between centers handles large aerospace and hydraulic components that smaller universal grinders cannot accommodate
- StuderTechnology software automatically calculates optimal grinding parameters, reducing reliance on operator experience for consistent results
- Direct-drive B-axis enables rapid, precise wheel head swiveling between external, internal, and angular grinding operations in a single setup
Limitations
- Price point starting around $350,000 new puts it well above entry-level cylindrical grinders, making it a significant capital investment for smaller shops
- Machine weight of 8,600 kg requires substantial floor reinforcement and rigging capabilities for installation
- The sophisticated linear motor and StuderGuide systems require Studer-trained service technicians for maintenance, limiting third-party service options
- 250 kg workpiece capacity, while generous, may not be enough for the heaviest roll grinding or large crankshaft applications
- StuderPictogramming interface, while intuitive for Studer users, has a learning curve for operators accustomed to standard Fanuc conversational programming
Best For
Frequently Asked Questions
01
New Studer S41 machines typically range from $350,000 to $550,000 depending on spindle configuration, automation packages, and center distance options. Fully loaded versions with robot loading systems can exceed $600,000. Used units from 2013-2020 sell in the $120,000-$250,000 range depending on hours, condition, and configuration. The S41 sits in the middle of Studer's lineup, above the Favorit but below the S51 for very large workpieces.
02
StuderGuide is Studer's patented guideway technology that combines hydrodynamic bearing principles (oil film for load capacity) with hydrostatic principles (pressurized oil for zero stick-slip). This gives the S41 extremely smooth axis motion at any speed, which directly translates to better surface finish and roundness. Traditional boxway or linear rail machines can exhibit stick-slip at very low feed rates, which shows up as chatter marks on the workpiece. StuderGuide eliminates this entirely.
03
The S33 and S31 are mid-size universal grinders with center heights of 175 mm and distances between centers up to 1,000 mm. The S41 steps up to 225/275 mm center height and 1,000/1,600 mm between centers, handling heavier workpieces (250 kg vs. 150 kg on the S33). The S41 also adds linear motor drives and the direct-drive B-axis. If your parts fit within the S33 envelope, it's a more economical choice. The S41 is for shops that genuinely need the larger capacity and faster axis response.
04
Yes. The S41's wheel head can be configured with up to four spindles: two external grinding spindles and two high-frequency internal grinding spindles running up to 120,000 RPM. The direct-drive B-axis swivels between spindle positions quickly, and Quick-Set software handles the changeover in under 60 seconds. This makes the S41 a true universal grinder that can complete complex parts in a single setup.
05
The S41 can achieve surface finishes down to Ra 0.1 um with appropriate wheel selection and grinding parameters. StuderTechnology software automatically calculates optimal spark-out times and feed rates to hit target surface finish specifications. For most production cylindrical grinding applications, Ra 0.2-0.4 um is typical, with Ra 0.1 um reserved for precision bearing seats, seal surfaces, and similar critical features.
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