Project Details
Modul ZFWZ 250/4 Recontrol with NUM CNC
S/N 9432, full recertification and recontrol
As with all used equipment MTB places for sale, this machine was totally cleaned, hydraulic and coolant systems drained and cleaned, all gib adjustments were checked, all worm lashes were adjusted, all broken or missing parts were replaced, all oil leaks repaired and then the machine was fully recertified using the ISO/DIN 6545 alignment standards for gear hobbing machines.
This machine was recontrolled using a NUM Axium Power CNC controlling two NUM MDLU2 digital Servo drives for the X and Z axes. All the old German controls were eliminated and replaced with new IEC components. New Heidenhain linear scales were installed on the two axes, for accurate size control and crowning capability. For cost reasons, the change gears were left in place to control the index and helical functions.
We also removed the old PIV system and installed a Vector drive and Vector duty rated motor to control the hob speed.
The new electrical cabinet we installed was painted to match the original machine colors.
Machine Mechanical Specifications:
| Pitch rating depending on application | 4.0 DP | Mod 6.3 mm |
| Maximum workpiece diameter | 20″ | 508 mm |
| Maximum axial travel | 10.875″ | 276 mm |
| Maximum center distance | 11.75″ | 298.5 mm |
| Minimum center distance | 1.75″ | 44.5 mm |
| Work table bore | 6.3″ | 160 mm |
| Maximum hob diameter | 5.7″ | 144.5 mm |
| Maximum hob length | 6.7″ | 170 mm |
| Hob shift length | 4″ | 101 mm |
| Minimum number of teeth | 8 | |
| Radial feedrate | .004-.020″/min | .1-.50 mm/min |
| Axial feedrate | .020-.400″/min | .5-10.0 mm/min |
| Tangential feedrate | .004-.020″/min | .1-.50 mm/min |
| Main motor power | 10 HP | 7.45 kW |
| Maximum helix angle | 45 Deg. | |
| Hob speed range I, infinitely variable | 50-200 RPM | |
| Hob speed range II, infinitely variable | 114-400 RPM | |
| Machine weight | 15,000 lb. | 6,800 kg |
Machine Equipment List:
- Chip conveyor
- Leveling wedges
- Full change gear set
- One 1.25″ hob arbor, outboard bearing, arbor wrench
- Two copies of the machine operators manual
- Two copies of all electrical and mechanical prints
- One full year warranty on the recontrol
- Tooling available upon request
Machine Control Specifications:
- NUM Axium Power Digital CNC
- Conversational programming
- Two axes of motion with NUM MDLU2 Digital Servos
- Programmable feedrates and RPM’s
- Multi-cut cycles
- Crowning and taper compensation
- Axial, radial/axial and radial cycles
- Tangential cycle
- Index controlled by change gears
- Helix controlled by change gears
- 460V plant power
