Worth knowing

Here we have compiled the most frequently asked questions and answers about our company, our working methods and the resources available to you. Do you have any questions that we have not listed here?

We will be happy to answer them!

Do you need documents such as certificates and attestations as proof of our skills? Then you will find all the necessary files as well as technical articles and other content on our "Downloads" page:

Information and certificates to download

Interesting facts about the company

Who runs the company?

In addition to the founder, Josef Rees Senior, his sons Georg and Valentin joined the company in the 1960s as the second generation. Thomas Rees is now the third generation of the family to run the company. With Mario Rees, the fourth generation is already responsible for the company.

How many people are employed at Rees?

Around 100 employees work in administration, production and quality assurance.

Which industries does Rees manufacture for?

The industry structure is broadly diversified - we mainly manufacture for the automotive, aviation, hydraulics, textile technology, general mechanical engineering and defense technology sectors.

FAQ on production

Which materials can be processed?

In principle, we machine all machinable materials, from brass to titanium. We mainly machine steel materials with a focus on stainless steel. However, we also process plastics, non-ferrous and light metals and even powder metallurgical materials.

What types of source material are possible?

We usually work with round material up to 90 mm in diameter from the bar. In the larger range, up to 250 mm diameter, machining is carried out in the chuck, starting from a saw blank. Other starting forms can be: forged blanks, gray cast iron blanks, die-cast aluminum or sand cast blanks, deep-drawn parts, sintered workpieces or parts made of tube material.

How is the raw material tested?

Each material delivery, regardless of its initial form, is given a unique, consecutive Rees batch number upon receipt. The material is checked for diameter, length, external condition, straightness, etc. Spectral analyses, hardness measurements, elongation tests and microstructure tests are carried out periodically in external laboratories. The type and frequency are defined in consultation with the customer.

How is the raw material documented?

The batch numbers of the material released for production are recorded at many points in the production process: in the warehouse, on every production machine, on every goods accompanying card, on every inspection order and every shipping release. In addition, all material certificates are available digitally so that they can be called up within seconds at any workstation in the network. This means that all raw material parameters are available in detail in production and quality assurance right from the start of production.

What types of workpieces can be produced?

Our machinery is designed for the production of precision turned parts and cubic parts with CNC milling. The focus is clearly on turning. The workpieces should offer a certain work content. We do not manufacture simple or DIN parts.

What are the processing dimensions?

Turned parts are produced in the diameter range of 3 - 90 mm from the bar, up to 250 mm diameter in the chuck, with lengths of up to 2 m and unit weights of up to 50 kg. Cubic parts can be machined up to 700 x 500 x 400 mm.

In what quantities does Rees produce?

Production runs in three-shift operation and is designed for medium to high quantities. This means that the smallest possible batch size is around 1,000 pieces. The largest single order to date amounted to 94 million parts of one type. The typical order size for us ranges from a few 1,000 to around 500,000 pieces.

Is the quality assurance system certified?

Our production has been regularly audited and approved for defense technology orders in accordance with APAP 4/9 (now AQAP2131) since 1982. Therefore, topics such as test planning, test equipment monitoring, production documentation and many other processes have been implemented in our company for over 40 years. In 1997, we were certified according to DIN ISO 9002 and VDA by TÜV-Cert. We have been certified to ISO TS 16949 since 2003.

How is quality planned?

Before production, a work plan and a test plan are created for each workpiece. All parameters relevant to reliable production are defined here. In production, all drawings are provided with positioned characteristics to which a corresponding inspection plan is referenced. A documented manufacturability assessment can also be carried out on request.

Is Rees familiar with PLC and FMEA?

Yes, standard statistical evaluation methods are used for all relevant processes. Data acquisition is computerized at various measuring stations. Evaluations can be centralized and carried out across departments.

What documentation is possible?

The type and scope of delivery documentation is defined in close consultation with our customers. For series parts, for example, the following documentation can be created as part of a DVS (documentation before the start of series production):

  • Process FMEA
  • manufacturability assessment
  • Parts life cycle
  • Production sequence diagram
  • Test sequence diagram
  • Inspection plan
  • Measuring equipment capability test
  • Initial sample test report according to VDA

What measurement options are there?

The following facilities, among others, are available for production and documentation:

  • 3D laser screening microscope
  • Measuring microscope
  • Measuring projectors
  • Conturo-Graph
  • 3D CNC measuring machine
  • Laser contour measuring machine
  • Topographic measurements
  • Coating thickness testing
  • Concentricity measuring devices
  • Roughness testers
  • Digital height gauges

Is there a complaints management system?

The quality status is continuously evaluated and assessed. An IT-supported process is initiated for every complaint, whether external from customers, to suppliers or internal to production. All causes, measures and costs are recorded in this process. If there was a complaint about a workpiece, production is automatically informed about it for the next production order. This minimizes repeat errors. The reporting system enables detailed evaluations with regard to error frequencies, error causes and error locations.

Is a CAD system available?

Yes, every part we produce is first created as a 3D solid model using SolidWorks. All subsequent testing and production processes are based on this. This 3D design is also used to verify every customer drawing submitted. Data import via IGES / STEP / VDA or DXF is standard.

Does Rees work with an ERP system?

We use an integrated program package for the optimal handling of all business processes. This offers all essential elements from purchasing to sales, from work preparation to production control and financial accounting. An integrated reporting and information system provides competent information at all times.