Starrag Berthiez RVU Series
Key Specifications
Max Spindle
machine type
grinding spindles
spindle power per spindle
operations
main drive
Overview
The Starrag Berthiez RVU Series is a family of vertical grinding machines that set standards in high-precision machining for the bearing and aerospace industries. Combines grinding, hard turning, boring, and part measurement in a single integrated platform.
Features up to four water-cooled grinding spindles at 45 kW each, speeds up to 18,000 RPM depending on wheel type. Multi-spindle configuration allows simultaneous or sequential roughing, finishing, and superfinishing. Optional dressing units, wheel changers, and measurement systems.
Incorporates hydraulic compensation, large-dimension ball screws, torque motor main drive, automatic wheel balancing, and comprehensive temperature control. Maintains micron-level accuracy for bearing race grinding and aerospace component finishing.
Hard turning integration alongside grinding eliminates re-clamping errors. Siemens SINUMERIK ONE CNC control. New machines: $1,000,000 to $4,000,000.
Full Specifications
| Parameter | Value |
|---|---|
| Machine Type | Vertical grinding machine (multi-process) |
| Grinding Spindles | Up to 4 water-cooled spindles |
| Spindle Power Per Spindle | 45 kW |
| Max Spindle Speed | Up to 18,000 RPM |
| Operations | Grinding, hard turning, boring, measurement |
| Main Drive | Torque motor |
| Balancing | Automatic wheel balancing |
| Temperature Control | Comprehensive thermal management |
| Optional Features | Dressing units, wheel changers, workpiece measurement |
| CNC Control | Siemens SINUMERIK ONE |
Specifications sourced from starrag.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Up to four 45 kW grinding spindles for simultaneous operations
- Integrated grinding, hard turning, boring, and measurement
- 18,000 RPM for CBN and diamond wheels
- Hydraulic compensation and auto balancing maintain micron accuracy
- Comprehensive temperature control for tightest tolerances
- Siemens SINUMERIK ONE with digital twin
Limitations
- Premium investment at $1M-4M
- Multi-process complexity requires skilled operators
- Specialized vertical grinding has limited resale market
- Multi-spindle adds maintenance complexity
Best For
Frequently Asked Questions
01
Grinding, hard turning, boring, and part measurement in a single platform.
02
Up to four water-cooled grinding spindles at 45 kW each.
03
Bearing manufacturing, aerospace, automotive drivetrain, and precision components.
04
Siemens SINUMERIK ONE with digital twin and process monitoring.
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