Basis for a powerful production and demanding workpieces.
Machine bed
- Inherently rigid structure, optimized after the finite element method, as a thick-walled and extensively ribbed casting
- Optimum chip removal through large chip and return channels for the chip flushing water
Machine column
- Thick-walled and extensively ribbed casting
- Closed, torsion and vibration-proof gantry-type column, thermosymmetric structure
- Integrated tool changer
Table component
- Compact cast-iron table housing
- NC rotary table with 0.001° division controlled by the 4th CNC axis
- Compressed-air prevents the penetration of coolant and dirt
- Hydraulic pallet clamping and fixing unit for pallets as per DIN 55201 with fixed indexing bolt (only NBH 290)
Digital axis drives
- Direct drive with maintenance-free A.C. servomotors and high-precisio recirculating ball screws with preloaded double nut
- Space-coded position measuring system, direct position measuring in all axes
Backlash-free form rail guidances
- All linear axes are equipped with form rail guidances
- High positioning accuracy
- High circularity accuracy
- High carrying capacity for a long working life due to the largely dimensioned roller bearing units
Modular spindle variants
- 25 - 6,000 rpm standard headstock (two-step gear) with steel ball bearing
- 25 - 10,000 rpm (two-step gear) with hybrid bearing [option]
- 25 - 12,000 rpm (motor spindle) with hybrid bearing [option]
Headstock
- Compact cast-iron housing with thermo-symmetric structure
- Working spindle as a complete unit; for service work, the unit may be replaced within a very short time
- High concentric running accuracy due to three-bearing support, extremely rigid spindle
- Long working life through labyrinth seal which in conjunction with compressed-air prevents the penetration of coolant and/or dirt
- Automatic two-step switching gear without clutch
- Spindle positioning via shaft encoder
- Connection for internal coolant supply
- Safe tool location since the tool taper is cleaned by air jet during the changing procedure
Motor spindle
- For further reduction of acceleration and deceleration times
- Smooth running with low vibration characteristics (no meshing frequency)
- Standard temperature equalization of spindle and motor
- Contactless sealing system with compressed-air
Parallel changer
- Due to the higher workpiece weights both, the nbh 290 and the nbh 350 are equipped with the proven parallel changer.
- Double pallet changer with linear pallet in-feed thus offering independent loading, unloading and resetting facilities
- The largely dimensioned loading and unloading space is protected by automatic doors against coolant and chips ejected from the working area
- The resetting station is protected by a light barrier
Tool magazine
- In-process re-setting of complete tool sets
- Tool loading station for inward and outward in-process transfer of single (worn-out) tools
- No affecting of tools by coolant and chips due to the overhead arrangement
- Location-coded tools with electronic management
Tool handling equipment
- Short access times through high traversing speed (160 m/min)
- Brushless, digitally controlled A.C. servo drives with absolute position measuring system
- Taper cleaning device in gripper of handling equipment
Tool changer
- Quick tool changing due to the electro-mechanical forward and backward motion of the double-tong unit
- Programmable accelerating and changing speeds for variable tool weights
- Safe tool changing due to hydraulic tool clamping
- Direct transfer of the tool from the tool handling equipment
- Brushless, digitally controlled A.C. servo drives
