Precision processing

The right process for every challenge.


We offer an extremely wide range of machining processes to meet the most challenging parts requirements – with a high level of precision down to the micron range.

KERN-LIEBERS stands out from other market competitors because of the extremely wide range of processes that we can offer.

That is why we always first check whether bore holes can be replaced by more cost-effective forming processes.

But when we do hit the limits of what can be done with forming processes, we use a range of other processes such as for example multi-spindle drilling. Some of our self-built systems operate with up to 40 tools working in parallel, enabling cost-effective and high-precision machining, including deburring. Coordinated machining sequences can be used to produce burr-free drilled holes.

To fulfill customer requirements that cannot be met using stamping or fin blanking processes, KERN-LIEBERS uses state-of-the-art multi-spindle machining centers for finishing work. These allow the processing of up to four workpieces simultaneously, with 5-axis machining providing a great deal of flexibility.

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 every level of complexity.

Deep-hole drilling is the process of drilling holes with a diameter to depth ratio of more than 10:1. KERN-LIEBERS uses this process in high volume production to create high-pressure bore holes in injectors. These requirements, with a diameter of 1.1 mm and a depth of 72 mm along with a material that is difficult to machine, represent an enormous challenge.

To achieve exact positioning, we have integrated this process into a CNC rotary transfer machine that ensures that errors are avoided and an economic machining process is achieved.

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.

Turned parts for the medical and watchmaking industries

  • The focus here is on small parts with diameters below 2.5 mm with high levels of precision
  • Material: Stainless steels, non-ferrous metals, special alloys at the customer's request
  • Applications: Measurement and control technology, medical technology, precision engineering, watchmaking

KERN-LIEBERS uses hard machining during turning, milling, drilling and reaming in order to avoid the need for grinding or honing operations.

In the manufacture of valve seats, we use hard machining in combination with superfinish operations to ensure the tightness of the seats. A 100% leak test using testing machines designed and built by KERN-LIEBERS ensures a tightness rate of 0 ppm.