Junker JUMAT 6000

$900,000 - $1,500,000 Updated 2026-03-16

Key Specifications

distance between centers

6,000 mm (236 in)

center height

300 mm (11.8 in)

max workpiece weight

1,500 kg (3,307 lb)

max grinding wheel diameter

600 mm (23.6 in)

grinding spindle type

High-frequency motorized spindle

wheel speed

Up to 120 m/s with CBN wheels

Overview

The Junker JUMAT 6000 is a heavy-duty CNC cylindrical grinding machine capable of grinding workpieces up to 6,000 mm between centers — placing it among the largest capacity CBN cylindrical grinders available from any manufacturer. Designed for the demanding requirements of energy, hydraulics, heavy equipment, and large-scale precision engineering, the JUMAT 6000 brings Junker's proven superabrasive grinding technology to workpieces that smaller machines simply cannot accommodate.

The JUMAT 6000 shares the same core engineering philosophy as the JUMAT 3000: hydrostatic guideways on both linear axes, high-frequency motorized grinding spindles optimized for CBN and diamond superabrasives, and a mineral-cast machine bed for maximum thermal and vibrational stability. At 6,000 mm between centers, the engineering challenge of maintaining micron-level tolerances across the full workpiece length is significantly greater, and Junker addresses this through enhanced bed stiffness, active thermal compensation, and integrated steady rest systems that support long workpieces during grinding.

Steady rest positioning is CNC-controlled and programmable, allowing multiple supports along the workpiece length to be repositioned automatically as the grinding wheel traverses. This is critical for slender, long shafts where deflection under grinding forces would otherwise compromise roundness and cylindricity. The steady rests use self-centering, adjustable-force contact to support without marking the workpiece surface.

The wheelhead supports CBN wheel diameters appropriate for the workpiece scale, with high-frequency spindle speeds providing the surface velocity needed for efficient superabrasive cutting. CNC wheelhead swivel accommodates tapered and shouldered sections in a single setup. Angular approach grinding for shoulder faces eliminates the need for separate face grinding operations.

Siemens 840D sl control manages the full multi-axis system including steady rest coordination, in-process gauging, and automation interfaces. For very long workpieces, in-process gauging typically employs multiple measurement points along the part to detect taper and correct automatically during the grinding cycle.

Pricing for the JUMAT 6000 falls in the $900,000-$1,500,000 range, reflecting the machine's size, engineering complexity, and the specialized market it serves. Lead times for new machines are typically 12-18 months.

Full Specifications

Parameter	Value
Distance Between Centers	6,000 mm (236 in)
Center Height	300 mm (11.8 in)
Max Workpiece Weight	1,500 kg (3,307 lb)
Max Grinding Wheel Diameter	600 mm (23.6 in)
Grinding Spindle Type	High-frequency motorized spindle
Wheel Speed	Up to 120 m/s with CBN wheels
Wheelhead Swivel	CNC-controlled ±45°
Guideways	Hydrostatic on X and Z axes
Machine Bed	Mineral cast polymer concrete, reinforced
Steady Rests	CNC-positioned, self-centering, programmable
CNC Control	Siemens 840D sl with Junker software interface
In Process Gauging	Multi-point gauging for taper detection and correction
Workhead Speed Range	1 - 300 RPM
Automation Interface	Robot / gantry loader compatible

Strengths & Limitations

Strengths

6,000 mm between-centers capacity addresses workpieces that no smaller cylindrical grinder can accommodate — crankshafts, lead screws, hydraulic cylinders, and large rolls
CNC-controlled steady rests with programmable positioning support long slender workpieces during grinding, preventing deflection and maintaining cylindricity
Hydrostatic guideways maintain consistent positioning accuracy across the full 6,000 mm Z-axis travel with zero mechanical wear
High-frequency spindle at CBN-capable surface speeds delivers cycle time advantages over conventional abrasives even on very large workpieces
Multi-point in-process gauging detects and corrects taper automatically during the grinding cycle — essential at 6 meter workpiece lengths
Active thermal compensation system maintains dimensional accuracy during long production runs and environmental temperature variation

Limitations

At $900,000-$1,500,000 new, the JUMAT 6000 represents a significant capital commitment — the market for 6-meter grinding machines is specialized and justification requires high-value, recurring work
12-18 month lead time for new machines requires careful production planning and cannot serve urgent capacity requirements
Machine footprint is substantial — facility planning must account for the full machine envelope plus operator and maintenance access, coolant systems, and automation
Operator and programmer training for 6-meter CBN grinding operations is highly specialized — skilled personnel are difficult to find and retain

Best For

Energy sector manufacturers grinding large hydraulic cylinder rods, piston rods, and valve stems that exceed the capacity of standard cylindrical grinders Heavy equipment and mining machinery manufacturers producing large-diameter, long drive shafts and transmission components Precision machine tool manufacturers grinding their own large ballscrews, spindle shafts, and structural components Aerospace and defense manufacturers grinding long structural components, actuator shafts, and landing gear cylinders requiring both length capacity and micron tolerances

Frequently Asked Questions

01 How do CNC steady rests work on a 6-meter cylindrical grinder?

CNC steady rests on the JUMAT 6000 are mounted on the Z-axis bed and move under program control as the grinding wheel traverses the workpiece. Each steady rest has three contact points that self-center on the workpiece diameter being ground — they adjust automatically as the diameter changes in stepped or tapered sections. The CNC program coordinates steady rest movement with grinding wheel position, retracting and repositioning rests as the wheel approaches to avoid interference. This automated coordination is essential for unattended operation on long workpieces.

02 What industries typically purchase the JUMAT 6000?

The primary customers are energy sector suppliers (hydraulic system manufacturers, oil and gas equipment), heavy industrial equipment manufacturers, large aerospace subcontractors grinding structural and actuator components, and specialized precision engineering firms serving these industries. The machine is also used by manufacturers of large machine tools grinding their own critical components such as long ballscrews and spindle assemblies. The combination of 6-meter capacity with superabrasive speed and precision is unique in the market.

03 Can the JUMAT 6000 grind multiple diameters and shoulders in one setup?

Yes. The CNC wheelhead swivel allows the grinding wheel to approach at angles for shoulder and taper grinding without reclamping. The Siemens 840D sl control manages the full multi-step grinding program — rough plunge, semi-finish traverse, finish traverse, and shoulder approach — as a single automated cycle. In-process gauging monitors each diameter and can adjust stock removal automatically. This reduces total cycle time and eliminates the setup errors that occur when workpieces must be repositioned between operations.

04 What is the typical lead time for a new JUMAT 6000?

Lead time for a new JUMAT 6000 is typically 12-18 months from order placement, depending on machine configuration, automation requirements, and Junker's production schedule. Because each machine at this scale is largely custom-engineered to the customer's workpiece envelope and process requirements, Junker conducts an application engineering process before quoting — this process itself can take 4-8 weeks. Customers should plan accordingly and engage Junker's application team 18-24 months before they need machine capacity.