Technical Data for ELKA Precision's 120,000RPM maximum speed hydrostatic internal grinding spindle with high-frequency oscillations of the rotating shaft:

• Maximal Range:
  120,000 RPMs
• Built-In Permanent Magnets Motor
• Continuous power:
  4.5 kW
• Feedback: No
• Oil Viscosity @ 40 Degrees C:
  2.2 cst
• Supply Pressure:
  60 Bars
• Radial Error Motion:
  <0.08 micrometers
• Axial Error Motion:
  <0.10 micrometers
• Friction Power Losses @ Maximal Speed:
  3.2 kW
• Flow Rate at 60 Bar Supply Pressure:
  6 liters/min
• Oil Pumping Power:
  0.6 kW
• Heat Generated by Motor Windings at Maximal Load:
  0.9 kW
• Total Maximal Heat Generation to be Compensated:
  4.7 kW (4,000 kcal/hour)
• Axial Stiffness:
  40 N/micrometer
• Axial Load Capacity:
  470 N
• Radial Stiffness at the Shaft Front End:
  23 N/micrometer
• Radial Load Capacity
  at the Shaft Front End:
  100 N
• Spindle Housing Cartridge Diameter:
  100 mm
• Spindle Cartridge Length (Including Oscillations Generating Device):
  380 mm

Contact ELKA Precision today for more information on our 120,000 RPM hydrostatic spindles with oscillating shafts, or your custom hydrostatic needs.

120,000 RPM Hydrostatic Internal Grinding Spindle with
High Frequency Axial Oscillations of the Rotating Shaft
model # ELP 120/4.5-HYBRID

The World's First "Hybrid" Spindle
ELKA Precision's engineers were the first to design and develop an internal grinding spindle which utilizes hydrostatic and hydrodynamic effects in the grinding process. By combining the high-speed rotation motion of a hydrostatic internal grinding spindle with high-frequency shaft oscillations, significantly improved grinding results can be achieved. These innovative hybrid spindles provide better thermal stability, increased rigidity, increased load capacity and much shorter grinding cycles than other high-speed spindles.

ELKA Precision's hydrostatic spindles which utilize high-frequency shaft oscillations are proven to provide extremely precise internal grinding capabilities, even with the most difficult to grind materials. With precise rotational accuracy and lasting vibration resistance, our 120,000 RPM hybrid spindle has tested accurate, is proven to be dependable and is ready to provide you with unmatched grinding efficiency and quality.

120,000 RPM Hydrostatic Internal Grinding Spindle
with High Frequency Oscillations of the Rotating Shaft
Dynamic Response at the Shaft Front Flange to 100 N Force

ELKA’s Precision offers a wide range of hydrostatic work head grinding spindles, milling spindles and internal grinding spindles. Please contact us for more information on our 120,000 RPM hybrid spindle, or for any of your hydrostatic grinding needs.