CAchse

CAchse is a term used to denote the C-axis, the rotational axis around the Z-axis, in CNC (computer numerical control) machining. In German-language documentation the term is commonly written as C-Achse, while English sources typically use C-axis. CAchse may appear as a stylized spelling or in some brand names, but it generally refers to the same concept.

Functionally, the C-axis provides rotary motion of either the workpiece (on a rotary table) or the tool itself in five- and multi-axis machining. This rotation allows the cutting edge to reach features that lie on angled surfaces or to tilt the workpiece for complex contours. In process data, C-rotations are specified with angle values (for example, C+30.0 or C-15.0) and are coordinated with the linear X, Y, and Z axes to define precise toolpaths.

Control and integration rely on servo or spindle motors with feedback encoders. The C-axis must be synchronized with other axes to avoid collisions and to maintain appropriate cutting angles. Depending on the machine, the C-axis may be implemented as a direct spindle rotation, a rotary table, or a combination of both, and is typically controlled by the CNC controller through standard pad or G-code commands.

Applications of the C-axis span aerospace, automotive, mold making, and turbine component manufacturing, where complex geometries and sculpted surfaces require rotational alignment of parts or tools. The concept originated with the evolution of CNC five-axis machines in the late 20th century and is supported by major control platforms from vendors such as FANUC, Siemens, and Haas.

See also: X-axis, Y-axis, Z-axis, A-axis, B-axis, C-axis, five-axis machining, CNC control.