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The all-purpose CNC thread grinding machines of the US/UL series were developed for grinding all types of high-precision male threads, such as worms, threaded spindles, ball screw spindles, threaded rolls as well as threading tools and – with the special version – for grinding hobs. Thanks not least to their highly stable basic structure – the machine body is made of grey cast iron – these machines ensure high productivity with maximum precision (machine basis: Reishauer thread grinding machine type US or UL900 or UL1800).

The use of the latest CNC dressing technology in combination with a powerful profile calculation software system allows for high flexibility and precision so that virtually all dressable profiles can be transferred with the highest degree of precision to the grinding wheel.

In the –U version, these machines are used for grinding single and multi-start gear worms (with standard profiles according to DIN such as ZI, ZK, ZA, ZN & ZC and for special profiles). Achievable accuracies are in the range 3 – 6 according to DIN 3962. Furthermore, this version can grind ball screw spindles (quality in the range P1 – P3, grinding lengths up to 2000 mm) and threaded rolls.

The –HG version is a true all-rounder with regard to its ability to grind standard & special threading tools. Focus: thread-cutting tap/forming tap (LH/RH).

In the –HW version, the machine is used in particular for grinding hobs and similar workpieces. Hob qualities of AAA as per DIN 3968 can be achieved without difficulty. Workpieces made from HSS and – with special equipment – carbide can be ground. The available mini grinding spindles are designed for a modulus range of 0.5 to 8.

The machines in the US/UL series are equipped with the latest drive and control technology (digital servo drives: Bosch-Rexroth or Siemens, axial and angle measurement systems: Heidenhain). Thanks to the workpiece-specific user interface by SMS (HMI), the CNC control system (Siemens 840D sl or Bosch Rexroth MTX) can easily be programmed by the operator in the dialogue system and ensures short setup times.

For series production, these machines can be equipped with an optional automatic loading system – adapted to the respective requirements.


Workpiece drive                                         (C-axis)

Workpiece slide                                          (Z-axis)

Grinding support                                        (X-axis)

Dressing axis radial                                    (V-axis)

Dressing axis axial                                     (W-axis)

Swivelling axis                           (optional) (A-axis)

Cooling nozzle tracking           (optional) (U-axis)

Available options for US500 / UL900 / UL2000:

Miscellaneous dressing units

Indexing installation

Automatic loading system