Siemens SINUMERIK 840D Operator's Manual page 147

A
03.04
C
C axis
C spline
Circular interpolation
Channel
Channel structure
CNC
CNC programming
language
COM
Compensation axis
Compensation table
Compensation value
Continuous-path mode
Contour
 Siemens AG, 2004. All rights reserved.
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
Axis around which the tool spindle describes a controlled rotational
and positioning movement.
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.
The -> tool is required to travel in a circle between defined points on
the contour at a specified feedrate while machining the workpiece.
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.
The channel structure enables the -> programs of the individual
channels to be executed simultaneously and asynchronously.
-> NC
The CNC programming language is based on DIN 66025 with high-
level expansions. The -> high-level CNC language and programming
allow, among other things, macros to be defined (groupings of
individual instructions).
Component of the NC control for the implementation and coordination
of communication.
Axis with a setpoint or actual value modified by the compensation
value
Table containing interpolation points. It provides the compensation
values of the compensation axis for selected positions on the basic
axis.
Difference between the axis position measured by the position sensor
and the desired, programmed axis position.
The purpose of continuous-path mode is to prevent excessive
deceleration of the -> path axes at the part program block boundaries
(in terms of the control, machine and other properties of the operation
and the user) and to effect the transition to the next block at as
uniform a path speed as possible.
Outline of the -> workpiece
A
Appendix
B Terms
A-147