Corvus NGB BBA

Corvus_BBA grinding machine


corvus NGB BBA

Production and regrinding of all known broaches with the 6-axis CNC grinding machine.

The 6-axis CNC grinding machine corvus BBA with its well thought out, attractive design is the leader in broach grinding machine. It is the result of years of co-operation with broach tool manufacturers from all over the world. The CNC grinding of broach tools is possible in a single clamping grinding gullets, spiral flutes, profile, spiral profile, clearance angle, chamfers, cylindrical grinding or surface grinding and all with the highest precision. Complete processing OD and face, up to 2800 mm cutting length, diameter up to 400 mm, maximum workpiece length that can be clamped 3500 mm. With its T-slotted table, the machine envelope can accept steady rests, tailstocks and magnetic chucks.

In all likelihood, the following broach tools and broach needles are ground the world over on a corvus BBA:

  • Internal broach tool: Profile broaching tool, round, polygonal, rectangular, hexagonal, keyway, feather key groove
  • External broach tool: Flat broaching tool, concave tool
  • hard broach tool
  • Large tool
  • Turbine tool
  • Helical fluting tool
  • Broach needle for twist broaching
  • Broach needle for hard broaching
  • Gear rack broach needles
  • Custom broach tools

Thanks to an A-axis torque of up to 1250 Nm, tools up to 1500 kg can be produced or re-ground. Transmission manufacturers appreciate the universal nature of this machine when regrinding of gear cutting tools such as gear hobs and shaper cutters.

Accessories for individual expansion of the application spectrum and increased productivity:

  • X-stroke of 1250 mm up to optional 3100 mm
  • Measurement system in all axes
  • Linear motors in all axes
  • Direct drive motor for cylindrical grinding tasks up to 1250 Nm torque
  • Dressing unit for dressing profiles
  • Manual or hydraulic tailstock
  • Steady rest
  • Magnetic chucks
  • Collet chucks, clamping mandrels
  • Coolant filtration system
  • Exhaust air filter
  • CO2 extinguishing system


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X-axis, 1250, 2100, 3100 mm travel, longitudinal axis, linear motor, resolution 10 nm

Y-axis, 400 mm travel, longitudinal axis, linear motor, resolution 10 nm

Z-axis, 400 mm travel, vertical column, resolution 0.1 µm (optional: up to 10 nm)

A-axis, work piece holder, free rotation, direct drive, 800 rpm, 218 nm, ISO50,

resolution 0,000045°, center height 210 mm (optional: 200 rpm, 1’250 Nm)

B-axis, 220°, grinding head swivel, direct measuring system, resolution 0,000045°

C-axis, 325°, grinding head rotation, direct measuring system, resolution 0,000045°


FANUC 31i B5, 5 axes simultaneously

15‘‘ color monitor with keyboard and touch screen, USB 2.0

Grinding head:

Double ended grinding spindle with positive air purge for grinding wheels ø 50mm to 250mm,

Water-cooled motor spindle with ceramic hybrid bearing,

14 (18) kW 100% (60%), 1’000 ÷ 18’000 rpm, HSK50


CORVUS bba 1’100: 14’000 kg (30’865 lbs)

CORVUS bba 1’700: 18’500 kg (40’786 lbs)

CORVUS bba 3’000: 22’000 kg (48’500 lbs)