The machine has high drive power of 45 kW at speeds up to 18000 rpm. Extra spindles are available with 25 kW at 5000 rpm.
Berthiez RVU 3700/350
Fewer rejects thanks to high concentricity and axial run-out accuracies (< 5 μm)
Wide manufacturing range thanks to precise and powerful table drive (torque motor)
Increased productivity through complete machining in just one set-up
vertical grinding machine
The RVU grinding machines set new standards in high-precision machining and are especially suitable for high precision grinding applications in the bearing and aerospace industries. The range can be equipped with up to four water-cooled grinding spindles which can achieve a performance of 45 kW at 18,000 rev/min. (according to the type of grinding wheel selected)
The RVU facilitates a complete machining processing without interruption as optional dressing units, grinding wheel changers and workpiece measurement are available. Additional options for hard metal machining boring and workpiece measurement increase the possible applications of the machine series considerably.
Axis configuration
Innovative Solutions
The hydrostatic thrust bearing and the rotary drive are driven by the torque motor. The hydrostatic table bearing with table driven by torque motor ensures a vibration-damping torsional stiffness.
The means for process optimization range from workpiece contact monitoring, process monitoring, automatic or partially automated dynamic balancing up for workpiece measurement.
The grinding head tilt can be adjusted in the range -5 ° to +275 °. Fixation is achieved by a Hirth coupling.
The geometrical properties with a concentricity and axial running
The machine offers the optional possibility for hard metal turning and drilling.
The RVU facilitates a complete machining processing without interruption as optional dressing units, grinding wheel changers and workpiece measurement are available. Additional options for hard metal machining boring and workpiece measurement increase the possible applications of the machine series considerably.
The cast iron construction allows excellent vibration damping and high stiffness. It forms the basis for high accuracy and excellent surface quality.
Everything from simply part storage to most complex flexible manufacturing systems – even of the largest machines. The Starrag Group makes Industry 4.0 a reality. Read more
Technical Data
| Swing diameter | mm | 3,700 |
| Grinding diameter | mm | 3,500 |
| Height under grinding wheel thickness 100 mm | mm | 500 / 800 |
| Standard table diameter | mm | 3,500 |
| Table speed | rpm | 70 |
| Table load | kg | 8,000 |
| Carriages | 1 or 2 |
| Grinding ram stroke | mm | 800 / 1,000 |
| Feed force | kN | 10 |
| X- and Y-axis speed max. | mm/min | 10,000 |
| Spindle-holder tilt | degree | - 5° + 275° |
| Tilt lead | degree | 1° (Hirth) |
| Power (conv. GW) (S1) | kW | 7 à 45 |
| Speed (conv. GW) | rpm | 4,000 à 12,000 |
| Power (CBN wheels) (S1) | kW | 15 / 25 |
| Speed (CBN wheels) | rpm | 8,000 / 18,000 |
| GW diameter (conv. or CBN) max. | mm | 150 / 300 / 400 / 500 / 600 |
| Wheel thickness max. | mm | 50 / 100 / 190 |
| Wheel-holder clamping taper face | x |
| Surface grinding spindle (conv. GW) (S1) | kW | 25 |
| Spindle speed | rpm | 5,000 |
| Wheel diameter max. | mm | 400 / 500 |
| Electropermanent magnetic chuck No. of poles / slots width | mm | 36 / 12H10 |
Berthiez RVU 3700/350
