Studer S31
Key Specifications
X Travel
Z Travel
Max Spindle
Spindle Power
distance between centers
workpiece length
How much does the Studer S31 cost?
Estimated price range
Our best estimate for a cnc grinding machine in this class — not a quote from Studer. Configuration moves it a long way.
Overview
The Studer S31 is a CNC cylindrical grinding machine built in four lengths: 400 mm (15.7 inch), 650 mm (25.6 inch), 1,000 mm (39.4 inch) and 1,600 mm (63 inch) between centers. Every length has the same 175 mm (6.9 inch) center height, 349 mm (13.75 inch) maximum workpiece diameter and 150 kg (330 lbs) workpiece weight limit.
Choosing the length is the main decision. Z travel is 500 mm (19.7 inch), 800 mm (31.5 inch), 1,150 mm (45.3 inch) or 1,750 mm (68.9 inch) in step with the four sizes. On every size the Z slide travels further than the distance between centers, so the wheel can run off both ends of a full-length part.
The weight limit does not grow with the bed. 150 kg (330 lbs) applies to the 1,600 mm (63 inch) machine just as it does to the 400 mm (15.7 inch) one, which makes the longest version a machine for long, slender shafts and not for heavy rolls.
The wheelhead side is one specification across the range. Wheels can be up to 508 mm (20 inch) in diameter and 80 mm (3.15 inch) wide on an 11.5 kW (15.6 hp) spindle that runs to 3,200 rpm, and the B axis has a swiveling range of 255°. X travel is 370 mm (14.6 inch). Travel speeds are 15,000 mm/min (590 inch/min) in X and 20,000 mm/min (787 inch/min) in Z.
The S22 lists 15 kW (20.5 hp) at the same 3,200 rpm, with a single Z travel of 850 mm (33.5 inch) and 310 mm (12.2 inch) of X. The S31 is the one to look at when length matters more than spindle power.
Full Specifications
| Parameter | Value |
|---|---|
| Distance Between Centers | 400 mm (15.7 inch) / 650 mm (25.6 inch) / 1,000 mm (39.37 inch) / 1,600 mm (63 inch), four sizes |
| Workpiece Length | 400 mm (15.7 inch) / 650 mm (25.6 inch) / 1,000 mm (39.4 inch) / 1,600 mm (63 inch), by size |
| X-Axis Travel | 370 mm (14.6 inch) |
| Max Travel Speed X | 15,000 mm/min (590 inch/min) |
| Z-Axis Travel | 500 mm (19.7 inch) / 800 mm (31.5 inch) / 1,150 mm (45.3 inch) / 1,750 mm (68.9 inch), by size |
| Max Travel Speed Z | 20,000 mm/min (787 inch/min) |
| Spindle Motor Power | 11.5 kW (15.6 hp) |
| Max Spindle Speed | 3,200 rpm |
| Max Grinding Wheel Diameter | 508 mm (20 inch) |
| Max Grinding Wheel Width | 80 mm (3.15 inch) |
| Swiveling Range B | 255 ° |
| Workpiece Diameter | 349 mm (13.75 inch) |
| Max Workpiece Weight | 150 kg (330 lbs) |
| Center Height | 175 mm (6.9 inch) |
Specifications sourced from studer.com — verified 2026-10-03
Strengths & Limitations
Strengths
- Four lengths from 400 mm (15.7 inch) to 1,600 mm (63 inch) between centers on one design
- Z travel of 1,750 mm (68.9 inch) on the longest size, more than its 1,600 mm (63 inch) between centers
- B axis with a 255° swiveling range
- Wheels up to 508 mm (20 inch) in diameter and 80 mm (3.15 inch) wide
- 370 mm (14.6 inch) of X travel, more than the 310 mm (12.2 inch) of the S22
Limitations
- Workpiece weight is 150 kg (330 lbs) on every size, including the 1,600 mm (63 inch) version
- Spindle power is 11.5 kW (15.6 hp), against 15 kW (20.5 hp) on the S22
- Workpiece diameter is limited to 349 mm (13.75 inch) on the 175 mm (6.9 inch) center height
- Studer's table for this model gives no internal grinding spindle figures, so internal work has to be specified separately
Best For
Frequently Asked Questions
01
Four distances between centers: 400 mm (15.7 inch), 650 mm (25.6 inch), 1,000 mm (39.4 inch) and 1,600 mm (63 inch). The matching Z travels are 500 mm (19.7 inch), 800 mm (31.5 inch), 1,150 mm (45.3 inch) and 1,750 mm (68.9 inch).
02
150 kg (330 lbs), with a maximum workpiece diameter of 349 mm (13.75 inch). Studer lists a single weight figure for the model, so the 1,600 mm (63 inch) size does not carry more than the shorter ones.
03
The grinding wheel can be up to 508 mm (20 inch) in diameter and 80 mm (3.15 inch) wide. The spindle is rated 11.5 kW (15.6 hp) with a maximum speed of 3,200 rpm, and the B axis has a swiveling range of 255°.
04
The S22 has a 15 kW (20.5 hp) spindle, 310 mm (12.2 inch) of X travel and one Z travel of 850 mm (33.5 inch). The S31 has 11.5 kW (15.6 hp), 370 mm (14.6 inch) of X and four lengths with Z travel up to 1,750 mm (68.9 inch). Both spindles run to 3,200 rpm.
05
The maximum travel speed is 15,000 mm/min (590 inch/min) in X and 20,000 mm/min (787 inch/min) in Z. X travel is 370 mm (14.6 inch) on all four sizes.
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