Schneeberger Gemini

$300,000 - $420,000 Updated 2026-03-17

Key Specifications

Number of CNC Axes

Operating Modes

Tool grinding + cylindrical/form grinding

Tool Diameter Range

1 – 40 mm

Maximum Grinding Length

320 mm

Grinding Spindle Configuration

3-spindle head (auto-index)

Grinding Spindle Speed

Up to 10,000 RPM

Overview

The Schneeberger Gemini is a 5-axis multi-task CNC tool grinding machine engineered to handle both tool grinding and general cylindrical/surface grinding operations on a single platform. The Gemini's defining characteristic is its dual-task capability — it is designed not only for the production of rotary cutting tools such as end mills, drills, and reamers, but also for grinding flat and cylindrical components such as gauges, punches, form tools, and precision mechanical components. This makes the Gemini an attractive proposition for tool rooms that need to consolidate grinding operations onto fewer machines.

The Gemini accommodates tool diameters from 1 mm to 40 mm in its tool grinding mode, with grinding lengths up to 320 mm — one of the larger capacity ranges in Schneeberger's lineup. In multi-task mode, the machine can handle workpieces of equivalent envelope dimensions for cylindrical and form grinding. Five simultaneously interpolating CNC axes provide the motion capability required for both tool geometry production and complex profile grinding. Schneeberger equips the Gemini with a robust three-spindle automatic indexing head, allowing three different wheel specifications to be pre-loaded and automatically selected during the cycle.

Schneeberger's MARS software drives the Gemini, providing both tool grinding parametric programs and a general CNC interface for custom component grinding programs. The software includes a collision avoidance simulation environment and integrates with Schneeberger's production data logging tools for quality system compliance. In-process gauging can be added to provide closed-loop control of ground dimensions in either tool grinding or component grinding modes.

The Gemini is constructed on a thermally stabilized granite composite machine bed with precision-ground guideways and direct-drive rotary axes to minimize backlash. The machine's automation interfaces support robot loading in both operating modes, making it practical for mixed-production automated cells. For facilities that historically maintained separate machines for tool grinding and cylindrical grinding, the Gemini offers a path to consolidation without sacrificing performance in either application.

Full Specifications

Parameter	Value
Number Of CNC Axes	5
Operating Modes	Tool grinding + cylindrical/form grinding
Tool Diameter Range	1 – 40 mm
Maximum Grinding Length	320 mm
Grinding Spindle Configuration	3-spindle head (auto-index)
Grinding Spindle Speed	Up to 10,000 RPM
Grinding Spindle Power	9 kW
Positioning Accuracy	±0.001 mm
Repeatability	±0.0005 mm
Machine Base	Granite composite, thermally stabilized
Control System	Fanuc + Schneeberger MARS software
In-Process Gauging	Optional

Specifications sourced from schneeberger.com — verified 2026-03-28

Strengths & Limitations

Strengths

Dual-task capability (tool grinding + cylindrical/form grinding) consolidates two machine types onto a single platform
40 mm maximum tool diameter is among the largest in Schneeberger's lineup, covering large-shank carbide and HSS tools
Three-spindle automatic indexing head allows three different wheel types in-cycle, minimizing downtime on complex multi-operation programs
320 mm grinding length accommodates extra-long series tools and longer mechanical components in form grinding mode
MARS software handles both tool grinding parametric programs and general CNC form grinding programs within one environment

Limitations

Broader multi-task capability means the Gemini may not optimize cycle time for high-volume single-tool-type production as efficiently as a dedicated tool grinder
5-axis configuration limits the most complex 6-axis geometries possible on competing premium platforms
Higher capital cost than single-purpose 5-axis tool grinders; ROI requires genuine utilization of both operating modes

Best For

Precision tool rooms that need to consolidate tool grinding and cylindrical/form grinding onto a smaller machine count Job shops offering both cutting tool production/regrinding and precision component grinding services Captive tool rooms in mold and die, aerospace, or medical device facilities where a mix of tool types and precision components must be ground Mid-size manufacturers seeking maximum versatility from a single grinding machine investment

Frequently Asked Questions

01 What makes the Gemini a multi-task machine rather than just a tool grinder?

The Gemini is designed with both a standard tool collet/workholding interface for rotary tool grinding and a precision chuck/center workholding option for cylindrical and form component grinding. Its MARS software includes programming modes for both applications, and the machine's travel and stiffness are designed to handle the different loading profiles of tool grinding and component grinding.

02 Can the Gemini grind tools larger than 40 mm in diameter?

The Gemini's standard configuration handles tool diameters up to 40 mm. For larger special tools, Schneeberger's Norma S universal grinding platform may be more appropriate, offering greater flexibility for large-diameter and non-standard applications.

03 How does the three-spindle head compare to the two-spindle head on the Sirius?

With three spindles, the Gemini can pre-load a roughing wheel, a semi-finishing wheel, and a finishing wheel simultaneously. Tools requiring all three operations can be ground completely without any manual wheel changes. The Sirius with two spindles can cover most operations but may require a manual wheel change for tools needing a third distinct wheel profile.

04 Is the Gemini suitable for lights-out operation?

Yes, with the robot loading automation option, the Gemini can run extended unattended production runs. The in-process gauging option adds process control that compensates for wheel wear automatically, making lights-out operation more reliable over long runs.

05 What is the difference between the Schneeberger Gemini and the Partner R?

The Partner R is Schneeberger's entry-level or specialist platform for specific grinding tasks, while the Gemini is a full 5-axis multi-task machine with a three-spindle head and broader capability. The Gemini is suited to production and complex tool programs; the Partner R targets simpler or more specialized grinding tasks.