Used STUDER S120 CNC Internal Grinder | Swiss Origin

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Product Highlight

Used STUDER S120 is a Swiss-made CNC internal cylindrical grinding machine designed for high-precision ID and face grinding. Equipped with dual grinding spindles, FANUC 21i-TB CNC control and automatic loading/unloading, this machine is well suited for high-volume production of precision automotive, hydraulic, bearing and other small cylindrical components.

Product Description

This pre-owned Swiss STUDER S120 CNC internal cylindrical grinding machine is configured for high-precision internal diameter and end-face grinding. It features dual grinding spindles, Fanuc Series 21i-TB CNC control, automatic loading/unloading and 3-axis linear scales, making it well suited for stable, high-volume precision production.

The machine is reported to achieve roundness around 0.5 μm, while one measurement screen shown in the supplied photos records a P-P value of 0.3 μm. It is an attractive used-machine option for manufacturers looking for STUDER grinding capability without the investment required for a new machine.

Technical Specifications

Specification	Details
Machine Condition	Used / Pre-Owned
Manufacturer	STUDER
Model	S120
Machine Type	CNC Internal Cylindrical Grinding Machine
Country of Origin	Switzerland
CNC Control	FANUC Series 21i-TB
Optional Control	FANUC 16i-TB, according to supplied specification
Center Height	125 mm
Swing Diameter	130 mm
Grinding Capability	Internal diameter and end-face grinding
Grinding Spindle Quantity	2
Spindle Arrangement	Parallel
Automation	Automatic loading and unloading
Position Feedback	3-axis linear scales / glass scales
X-Axis Travel	300 mm
X-Axis Rapid Speed	20,000 mm/min
X-Axis Resolution	0.0001 mm
Guideway Spacing	280 mm
Z-Axis Travel	180 mm
Z-Axis Rapid Speed	15,000 mm/min
Z-Axis Resolution	0.0001 mm
Grinding Headstock	Fixed type
Grinding Spindle Mounting Diameter	Ø100 mm / Ø120 mm
High-Speed Internal Grinding Spindle	Up to 60,000 rpm
Second Internal Grinding Spindle	Up to 42,000 rpm
Workhead Speed	1–1,500 rpm
Workhead Interface / Taper	MK4 / Ø70 mm
Workhead Spindle Bore	Ø26 mm
Workhead Drive Power	2.8 kW
Grinding Load	100 Nm
Listed Roundness Accuracy	0.0004 / 0.0002 mm
Standard C-Axis Measurement Resolution	0.0001°
Optional Q-Axis Swivel Range	-5° to +30°
Q-Axis Resolution	0.0001°
Dressing System	Disc diamond-wheel dresser
Dresser Taper	MK1 short taper
Swiveling Dressing Spindle	Ø50 / Ø72 mm
Total Installed Power	43 kVA
Pneumatic Pressure	5.5 bar
Machine Weight	Approx. 5,100 kg
Reported Production Roundness	Approx. 0.5 μm
Measurement Shown in Photo	P-P 0.3 μm

Applications & Suitable Parts

The used STUDER S120 CNC internal grinder is especially suitable for manufacturers requiring accurate bore grinding, end-face grinding, repeatable roundness and automated batch production.

Typical applications include:

Fuel injector components and injector nozzles
Precision nozzles and sleeves
Tool holders and precision tool interfaces
Hydraulic and electronic valve spools
Bearing components
Precision shafts and transmission components
Gears and related drivetrain parts
Gauges, inspection fixtures and precision tooling
Automotive precision hardware
Semiconductor equipment components
Precision automation components
Textile and sewing machinery parts
Cylindrical and sleeve-type components
High-volume precision bore grinding
Components requiring both ID grinding and face grinding

Its combination of two grinding spindles, automated loading/unloading, high-speed internal grinding and precision axis feedback makes it particularly attractive for repetitive production where cycle stability and dimensional consistency are important.

FAQ

Is this STUDER S120 a new or used machine?

This is a used / pre-owned STUDER S120 CNC internal cylindrical grinding machine manufactured in Switzerland. It is not being sold as a new STUDER machine. Actual condition, configuration and accuracy can be verified before purchase.

What can the STUDER S120 grind?

This S120 is suitable for internal diameter grinding and end-face grinding of precision cylindrical components. Typical parts include fuel injector components, nozzles, valve spools, bearing parts, sleeves, tool holders and precision automotive components.

What CNC control is installed on this used STUDER S120?

The machine shown is equipped with a GE FANUC Series 21i-TB CNC control. The supplied technical information also lists FANUC 16i-TB as an optional control configuration for this machine series.

What roundness accuracy can this used internal grinder achieve?

The supplied machine information reports production roundness of approximately 0.5 μm. One inspection screen provided with the machine shows a P-P measurement of 0.3 μm. Actual achievable accuracy depends on the grinding wheel, tooling, workpiece, setup and machine condition, so a test grind is recommended.

Does this STUDER S120 support automated production?

Yes. The listed configuration includes automatic loading and unloading, together with dual grinding spindles. This makes the machine suitable for repetitive and higher-volume precision grinding applications.