Used STUDER S120 CNC Internal Grinder | Swiss Machine

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Product Highlight

Used STUDER S120 is a Swiss-made CNC internal cylindrical grinder designed for precision ID and face grinding. Equipped with FANUC 21i-TB control, dual grinding spindles and automatic loading/unloading, it provides a practical solution for manufacturers requiring stable, repeatable and efficient batch production of high-precision components.

Product Description

Used Swiss STUDER S120 CNC internal cylindrical grinding machine equipped with FANUC Series 21i-TB control, dual grinding spindles and automatic loading/unloading. Designed for high-precision ID and face grinding, this machine offers 0.0001 mm axis resolution and reported production roundness around 0.5 μm, making it well suited for stable batch production of precision small components.

Technical Specifications

Specification	Details
Brand	STUDER
Model	S120
Machine Type	CNC Internal Cylindrical Grinding Machine
Condition	Used / Pre-Owned
Country of Origin	Switzerland
CNC Control	GE FANUC Series 21i-TB
Grinding Process	Internal Diameter Grinding / Face Grinding
Grinding Spindles	2
Spindle Arrangement	Parallel
Center Height	125 mm
Swing Diameter	130 mm
X-Axis Travel	300 mm
X-Axis Rapid Speed	20,000 mm/min
X-Axis Resolution	0.0001 mm
Z-Axis Travel	180 mm
Z-Axis Rapid Speed	15,000 mm/min
Z-Axis Resolution	0.0001 mm
Distance Between Guideways	280 mm
Guideway Type	Roller Bearing / Hydrostatic Option
Grinding Spindle Mounting Diameter	Ø100 mm / Ø120 mm
Installed High-Speed Grinding Spindle	Approx. 60,000 rpm
Installed Secondary Grinding Spindle	Approx. 42,000 rpm
Workhead Speed Range	1–1,500 rpm
Workhead Taper	MT4 / Ø70 mm
Workhead Spindle Bore	Ø26 mm
Workhead Drive Power	2.8 kW
Live Grinding Load	100 Nm
Workhead Roundness Accuracy	0.0004 / 0.0002 mm, configuration dependent
C-Axis	Standard
C-Axis Measuring Resolution	0.0001°
Optional Q-Axis Swivel Range	-5° to +30°
Optional Q-Axis Resolution	0.0001°
Dressing System	Rotary Diamond Wheel Dresser
Dresser Taper	MK1 Short Taper
Rotary Dressing Spindle Diameter	Ø50 / Ø72 mm
Total Connected Load	Approx. 43 kVA
Pneumatic Pressure	Approx. 5.5 bar
Machine Weight	Approx. 5,100 kg
Automation	Automatic Loading / Unloading

Accuracy note: The supplied production information reports roundness of approximately 0.5 μm. One roundness inspection result indicates approximately 0.3 μm P-P. Actual achievable accuracy and surface quality depend on the grinding wheel, tooling, workpiece material, setup and machine condition, so a customer-specific test grind is recommended before final acceptance.

Applications & Suitable Workpieces

The used STUDER S120 CNC internal grinder is designed for precision internal cylindrical and face grinding of small and medium-sized components, especially where repeatability and production efficiency are important.

Typical applications include:

Diesel fuel injector and fuel-system components
Precision nozzles and nozzle bodies
Hydraulic valve spools and hydraulic components
Bearing rings and bearing components
Precision sleeves and bushings
Tool holders and precision tooling components
Gauges and inspection-tool components
Automotive precision metal parts
Small shafts and transmission components
Precision components for automation equipment
Semiconductor equipment components
High-accuracy mechanical components requiring batch grinding

STUDER itself positions internal cylindrical grinding equipment for applications such as spindle shafts, spindle housings, bushes, drive components and other high-precision workpieces.

Why This Used STUDER S120 Is Attractive for Production

The combination of dual grinding spindles, FANUC CNC control, automatic loading/unloading and high-resolution axes makes this machine particularly suitable for repetitive precision production.

For manufacturers already producing the same component in medium or large quantities, the dual-spindle arrangement can reduce unnecessary handling and help integrate several grinding operations into a more efficient cycle.

Its main selling points are:

Swiss-built STUDER grinding platform · Dual grinding spindles · Automatic loading/unloading · FANUC 21i-TB control · 0.0001 mm axis resolution · Precision ID and face grinding · Reported roundness around 0.5 μm · Suitable for production automation

FAQ

What grinding operations can this STUDER S120 perform?

This configuration is mainly intended for internal diameter grinding and face grinding. Its dual-spindle arrangement allows different grinding operations or spindle specifications to be combined for efficient precision production.

What CNC control is installed on this used STUDER S120?

The machine is equipped with a GE FANUC Series 21i-TB CNC control, a widely used industrial CNC platform suitable for precision grinding applications.

What roundness accuracy can the STUDER S120 achieve?

The supplied production information reports roundness of approximately 0.5 μm, while one inspection result indicates approximately 0.3 μm P-P. Actual production accuracy depends on the workpiece, grinding wheel, fixtures, dressing condition and grinding process, so a test grind is recommended.

Can this STUDER S120 be used for automated mass production?

Yes. This machine is configured with automatic loading and unloading together with two grinding spindles, making it particularly suitable for repetitive batch production of precision components such as injector parts, valve components, bearing parts, sleeves and similar cylindrical workpieces.