Siemens SINUMERIK 840D sl Programming Manual page 650

Glossary
C axis
Axis around which the tool spindle describes a controlled rotational and positioning
movement.
C spline
The C-spline is the most well-known and widely used spline. The transitions at the
interpolation points are continuous, both tangentially and in terms of curvature. 3rd order
polynomials are used.
Channel
A channel is characterized by its ability to execute a -> parts program independently of other
channels. A channel exclusively controls the axes and spindles assigned to it. Parts
programs run on various channels can be coordinated by -> synchronization.
Channel structure
The channel structure enables the -> programs of the individual channels to be executed
simultaneously and asynchronously.
Circular interpolation
The -> tool is required to travel in a circle between defined points on the contour at a
specified feedrate while machining the workpiece.
CNC
See -> NC
COM
Component of the NC control for the implementation and coordination of communication.
Compensation axis
Axis with a setpoint or actual value modified by the compensation value
Compensation table
Table containing interpolation points. It provides the compensation values of the
compensation axis for selected positions on the basic axis.
Compensation value
Difference between the axis position measured by the position sensor and the desired,
programmed axis position.
Glossary-4
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
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