Freistellwinkel

Freistellwinkel is a term used in German technical language to denote a clearance or relief angle. It describes the tilt that creates free space between surfaces in contact, thus reducing friction and wear. The concept is used in various engineering contexts, particularly in machining and mechanical design.

In machining, the Freistellwinkel refers to the clearance angle at the edge of a cutting tool or to the relief of the workpiece surface relative to the tool path. This angle prevents rubbing between flank and freshly machined surface, lowers cutting forces, and influences tool life and surface quality. The optimal Freistellwinkel depends on the workpiece material, tool geometry, cutting speed, and cooling; manufacturers provide guidelines, and numerical standards vary between DIN/ISO.

In mechanical design, Freistellwinkel describes intentional offsets between mating parts to meet functional clearance, accommodate tolerances, or allow for assembly. The concept is also relevant in stamped or molded components where draft angles or reliefs ensure proper release and fit.

Note that the term may be used differently in different sources; precise definitions and tolerances are specified in standards or manufacturer documentation. The Freistellwinkel is one element among several related geometry angles, alongside cutting angle and rake angle.