KELLENBERGER KEL VISTA UR 1-2-3 BJ. 2008 inkl. B-Achse und Innenschleifen Option

COMMERCIAL OFFER – KELLENBERGER KEL-VISTA UR

High-Precision CNC Universal Cylindrical Grinding Machine

Manufacturer: KELLENBERGER – Switzerland

Model: KEL-VISTA UR 1-2-3

Year of manufacture: 2008

CNC control: FANUC 21i-TB

Configuration: CNC universal cylindrical grinding machine with swivelling B-axis

Machine weight: 3,500 kg

Country of manufacture: Switzerland

Machine location: Germany

Availability: Upon request

MACHINE DESCRIPTION

We are pleased to offer a KELLENBERGER KEL-VISTA UR, manufactured in 2008, a high-precision CNC universal cylindrical grinding machine of Swiss manufacture, designed for machining mechanical components requiring particularly demanding dimensional and geometrical accuracy.

The machine is equipped with a FANUC 21i-TB CNC control, universal UR configuration and a swivelling B-axis grinding wheelhead.

A particularly valuable feature is the extensive technical overhaul and major maintenance work carried out directly by the specialised KELLENBERGER service department in September 2025.

During these operations, numerous mechanical, electronic, pneumatic and safety-related components were replaced, including the Z-axis ball screw.

These documented maintenance operations represent a significant added value compared with machines of the same manufacturing year that have not undergone comparable recent technical maintenance.

MAIN TECHNICAL SPECIFICATIONS

WORKING CAPACITY

Centre height: 175 mm

Maximum workpiece diameter: 349 mm

Maximum workpiece weight between centres: 100 kg

Distance between centres, 600 version: 600 mm

Distance between centres, 1000 version: 1,000 mm

Maximum grinding length, RS configuration: 400 / 800 mm

Maximum grinding length, UR/R configuration: 600 / 1,000 mm

The grinding length specifications refer to the two dimensional versions listed in the manufacturer's technical documentation. The exact dimensional version of the offered machine remains subject to confirmation.

WORKHEAD

Swivelling range: -10° to +100°

Spindle speed: 8–800 rpm

Continuously variable spindle speed

Internal spindle taper: Morse MT5

Reducing sleeve: MT5 / MT4

External spindle mounting: DIN 55026, size 5

Maximum permissible torque: 100 Nm

Manufacturer-specified roundness error for overhung workpieces: Less than 0.5 µm

Maximum workpiece weight when grinding between centres: 100 kg

TAILSTOCK

Taper: MT4

Quill travel: 48 mm

Optional micrometric adjustment: ±60 µm

1. B-AXIS – SWIVELLING GRINDING WHEELHEAD

This specific UR configuration incorporates a swivelling intermediate platform with automatic indexing.

TECHNICAL SPECIFICATIONS – UR CONFIGURATION

Swivelling range: -210° to +10°

Automatic indexing

Indexing increment: 1°

For comparison, the R/RS configurations feature manual indexing with increments of 2.5° and the same swivelling range.

IMPORTANT INFORMATION

The presence of the B-axis on the offered machine is also confirmed by the official KELLENBERGER service report dated September 2025, which documents specific maintenance operations on the grinding wheelhead and its swivelling mechanism.

GRINDING SYSTEM

GRINDING WHEEL DRIVE

Grinding wheel motor power: 6.0 kW / 8 HP

MAXIMUM SPECIFIED PERIPHERAL WHEEL SPEEDS

Grinding wheel Ø300 mm: 30 m/s – 5,905 ft/min

Grinding wheel Ø400 mm: 40 m/s – 7,875 ft/min

Grinding wheel Ø450 mm: 45 m/s – 8,860 ft/min

R GRINDING WHEELHEAD

Grinding wheel mounting: Left-hand side

Grinding wheel dimensions: Ø450 × 80 mm

RS GRINDING WHEELHEAD

Grinding wheel mounting: Right-hand side

Grinding wheel dimensions: Ø450 × 80 mm

UR GRINDING WHEELHEAD

Standard left-hand mounting: Ø400 × 63 mm

Optional enlarged left-hand mounting: Ø400 × 80 mm

Optional enlarged left-hand mounting: Ø450 × 63 mm

Optional additional right-hand mounting: Ø300 × 40 mm

INTERNAL GRINDING PROVISION

Locating bore for high-performance internal grinding spindles: Ø80 mm

The above dimensions represent the technical configurations specified by the manufacturer. The actual presence of individual grinding wheelheads, additional spindles and optional accessories must be verified directly on the machine.

CNC AXES AND MACHINE MOVEMENTS

Z-AXIS – LONGITUDINAL TABLE

600 VERSION

Maximum travel: 750 mm

Maximum traverse speed: 12 m/min

Resolution: 0.1 µm

1000 VERSION

Maximum travel: 1,150 mm

Maximum traverse speed: 12 m/min

Resolution: 0.1 µm

SWIVELLING UPPER TABLE

600 version: 0° to +9°

1000 version: 0° to +6°

1000 version with workpieces shorter than 800 mm: 0° to +9°

X-AXIS – GRINDING WHEEL SLIDE

Maximum travel: 350 mm

Maximum traverse speed: 6 m/min

Resolution: 0.1 µm

AUXILIARY SYSTEMS

PNEUMATIC SYSTEM

Minimum compressed air pressure: 6 bar

Compressed air consumption: Approximately 2.5 m³/h

COOLANT SYSTEM

CONFIGURATION 1

Specified maximum inlet pressure: 3 bar

Maximum flow rate: 80 l/min

CONFIGURATION 2

Specified maximum inlet pressure: 1 bar

Maximum flow rate: 160 l/min

The two coolant configurations correspond to the specifications stated in the available technical documentation and do not constitute confirmation that both systems are installed simultaneously.

EXTENSIVE TECHNICAL OVERHAUL AND MAJOR MAINTENANCE – SEPTEMBER 2025

One of the machine's principal advantages is the extensive technical maintenance performed by the official KELLENBERGER service department between 9 and 25 September 2025.

The maintenance operations are documented in an official manufacturer's service report signed on 27 September 2025.

A. MECHANICAL OVERHAUL AND CNC AXES

Replacement of the Z-axis ball screw

Replacement of the Z-axis standstill monitoring components

Replacement of the X-axis standstill monitoring system

Replacement of the X-axis and Z-axis regulating valves

Partial replacement of piping and fittings

Replacement of needle roller bearings

Disassembly and cleaning of the upper table and workhead spindle assembly

B. B-AXIS AND GRINDING WHEELHEAD MAINTENANCE

Disassembly and lifting of the grinding wheelhead at the B-axis

Cleaning of the swivelling mechanism gear teeth

Replacement of V-shaped seals

Replacement of pins and spring assemblies

Replacement of the grinding wheelhead V-belts

These operations are particularly relevant for a universal cylindrical grinding machine, as they directly concern the mechanical positioning and swivelling system of the grinding wheelhead.

C. WORKHEAD SPINDLE AND DRIVE SYSTEM

Replacement of the workhead spindle timing belt

Replacement of lamellar sealing rings

Replacement and reconnection of pneumatic lines

Replacement of the standstill monitoring sensor, adapter and associated cable

D. LUBRICATION AND PNEUMATIC SYSTEM

Complete replacement of the lubrication unit

Replacement of pneumatic maintenance units

Replacement of pneumatic lines and fittings

Cleaning and refilling of the cooling unit

E. ELECTRONIC COMPONENTS AND SAFETY SYSTEMS

Replacement of an electronic circuit board and associated wiring

Replacement of the ELASO sensor pair and extension cable

Replacement of the Schmersal safety component on the front door

Replacement of the enabling pushbutton on the operator panel

Restoration of the correct joystick mounting

Correction of the electronic handwheel rotation direction and reversal of the corresponding A/B assignments

F. MACHINE GUARDING AND GENERAL MAINTENANCE

Replacement of protective glass panels

Replacement of bellows

Replacement of rubber protective elements

Replacement of protective covers

General cleaning of the machine

DOCUMENTED INVESTMENTS AND TECHNICAL ADDED VALUE

In addition to the official KELLENBERGER service report, documentation is available relating to a spare parts order placed with the manufacturer.

Documented net value of the spare parts order: EUR 39,670.59

This amount relates specifically to the spare parts listed in the purchase order and does not necessarily represent the total cost of the technical overhaul, including service engineers' labour hours.

The maintenance and replacement operations carried out in 2025 represent a significant commercial and technical added value, particularly in the following areas.

PRECISION AND AXIS MOVEMENT

Replacement of the Z-axis ball screw and maintenance of important axis control and monitoring components.

MECHANICAL RELIABILITY

Renewal of belts, seals, transmission components, bearings and mechanical elements of the B-axis swivelling assembly.

OPERATIONAL SAFETY

Renewal of sensors, monitoring devices and electrical safety components.

MAINTAINABILITY

Replacement of the lubrication unit, pneumatic components and numerous machine protective elements.

DOCUMENTED SERVICE HISTORY

Availability of the official KELLENBERGER technical service report and the corresponding spare parts order documentation.

CONCLUSION

The KELLENBERGER KEL-VISTA UR is therefore a Swiss-manufactured high-precision CNC universal cylindrical grinding machine from 2008 which underwent substantial technical maintenance and component replacement work in September 2025.

The documented spare parts investment of EUR 39,670.59 net, together with the extensive official KELLENBERGER service operations, represents a particularly attractive feature for prospective buyers.

These documented improvements distinguish the machine from comparable equipment of the same manufacturing year without a similarly comprehensive and traceable maintenance history.