MZ120 – Gear hobbing/worm milling machine

The MZ120 is a gear hobbing and worm milling machine for the production of gears and worm gears, straight-toothed bevel wheels, worms and threads. It is suitable for large and small series.

  • The machine is mounted on a solid cast iron base, inclined to the front side by 15°.The longitudinal-, the shift- and the plunge axis are driven by a ball screw.The work piece spindle can be equipped with W20 collets, retractable arbors or customer specific work holding.The CNC-tailstock clamping pressure can reach up to 2000 N, torque controlled. Below 500 N, the clamping pressure is generated by spring load.The CNC-shift axis is integrated in the hob head and has a travel distance of 34 mm. The Hobbing- and milling spindle is equipped with ball bearings. Tool holders are fit to a cylindrical bore. The swivel angle on the hobbing- and milling spindle is programmable. The range go’s from +45° to 0° to -120°.

    The spindle drive is over a precision worm gear.


    • Synchronous axis drive of tailstock spindle (hobbing), dismountable
    • Work piece positioning by dynamic pressure sensor
    • Customer specific loading- and unloading systems


    • Fanuc 30i-B
    • 6 servo axis, optional up to 8 axes
    • Dialog programming
    • Swiveling touch screen with user panel

    Technical features

    • Structure out of solid cast iron- and steel, in vibration absorbing execution
    • Improved outlet for chips and coolant
    • Axis distance between work piece and hob up to 70 mm
    • Swivel angle hob head: gear hobbing ± 45 °, worm milling ± 30 °
    • Hob shift 34 mm
    • Clamping systems: center – center, collet W20, retractable arbor, guide bush
    • Hydraulic deburring unit
    • Automatic central lubrication
    • Revolving tailstock (axial)

    Workpiece data

    • Module, depending on the material, max. 1.0 mm
    • Workpiece diameter 2 – 45 mm
    • Workpiece length up to 250 mm
    • Hobbing length up to 150 mm

    Tool data

    • Gear hobbing: diameter 16 – 32 mm, length up to 40 mm
    • Worm milling: diameter 53 – 70 mm

    Workpiece spindle

    • Ratio i = 1:3.875
    • Speed up to 750 rpm

    Hobbing- and milling spindle

    • Diameter 40 mm
    • Speed up to 7’000 rpm
    • Power 0.55 kW
    • Torque 2.4 Nm