Gruenewald - Graevenwiesbach
Case Study Gruenewald - Graevenwiesbach

All-round coordinate measuring system facilitates testing of constant velocity joints and tools

Grünewald Feinmaschinenbau has facilities in Grävenwiesbach in Hessia and in Weilmünster and is a company that enjoys a complex challenge. This family-owned business produces various drive components for its customers to drive a diverse range of vehicles, such as HGVs, military vehicles, racing cars, ships or rail vehicles. Constant velocity joints in particular form a large part of the order volume. Flexibility is a must for this commission-based work and so the company‘s metrology also has to be flexible. With the universally usable Leitz Reference and the QUINDOS software, Grünewald is able to measure ball races as well as toothed wheel work of constant velocity joints in one measuring process - and obtain a reliable documentation at the same time.

For Grünewald, flexibility covers more than the range of parts they produce. In terms of batch size, the company also offers a variety of options for drive components, from prototypes to small, medium and large series. In addition, the company offers a jig making, tool making and special machine building service. What is the production strategy behind this approach? The company firmly believes in offering a broad range of production services. „Whether it is machining before heat treatment, toothed wheel technology or heat treatment, we have the expertise“, says Markus Grünewald who is the third generation Managing Director of the company. „Anybody can get a serial production going but when the batch size is small, you have to be able to control it. For example, when you are building a prototype and there is a change of material at short notice, you have to be able to influence the process directly.” So it is no surprise that the proportion of specialist workers is more than 90 percent.

Grünewald is one of the first companies to have taken constant velocity joints into their production programme. A constant velocity joint transmits the torque evenly from one shaft to another shaft - irrespective of the angle between these two shafts. For example in a lorry the joints transmit the torque from the drive shaft to the wheels. Usually constant velocity joints consist of six balls that move between a ball race and the hub of an axle. A ball retainer encloses the balls and keeps them in their race...

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