Precision processing

Precision processing

Precision processing

A full range of processes for precision machining – the innovative solution for your specific requirements.


To fulfill customer requirements that cannot be met using stamping or fine blanking processes, KERN-LIEBERS uses advanced machining centers for finishing work.

From the manufacture of prototypes at our CNC machining centers to fully automatic production at automated robot rotary transfer machining centers, we have the right machine for any number of parts and for various levels of complexity.


Turning processes are used to finish finely cut blanks or sleeves manufactured with rotary swaging processes. The advantage of turning is the high runout accuracy of the dimensions produced by turning in a single clamping operation. To give an example, sleeves produced by rotary swaging are machined on the end faces and partially on the outside diameter.

Our systems are automated, can be flexibly loaded with robots, and allow impact-free loading and unloading of delicate precision parts, allowing for example high-volume production of IT 7 fits (18 microns in the diameter range 10 mm to 18 mm).

We can also process materials that are difficult to machine.

Double-side grinding

Double-side grinding is used for the manufacture of high-precision metal parts so as to reach a very good level of flatness, parallelism and surface finish.

Parts manufactured with double-side grinding can have important properties such as precision, efficiency, rigidity, stability, and automation.

Deburring processes

In order to improve surface topography, we apply deburring processes to the areas that are hard to reach, such as small bore holes or grooves. During processing, the material is dissolved. This process is particularly suitable for challenging requirements in terms of the cleanliness of the parts, producing a gloss level that meets the requirements of visually demanding applications.

Vibratory finishing

One of the technical requirement for KERN-LIEBERS parts is a defined edge rounding, including at places that cannot be reached by grinding tools. To avoid damaging the yarn, the part surface must also be perfectly smoothed.

This is achieved using special vibratory finishing processes developed by KERN-LIEBERS. These processes are fully reproducible in every respect. We can guarantee our customers that different batches can be mixed with no visible effect on knitting results, again underlining the quality awareness of KERN-LIEBERS.

KERN-LIEBERS has a fully equipped vibratory finishing department that can meet the different requirements of our wide range of products. Particularly challenging in this area is the machining of long, thin workpieces without distortion or damage.

The need for continuous development of processes is understood by everyone at KERN-LIEBERS as an essential requirement for securing our technological lead.

Belt grinding, brushing

Belt grinding and/or brushing are commonly used methods for removing burrs. Belt grinding is used to remove the burrs (larger components only), after which the edges are rounded by brushing. Small holes (less than 1mm in diameter) are difficult to deburr with this process, because the bristles cannot penetrate properly into the holes.

For small parts with small hole diameters, KERN-LIEBERS uses its own part-specific brushing systems with special brushes. These systems can also be used for non-magnetic parts.