
14.TOOL COMPENSATION FUNCTION NC FUNCTIONS B-63782EN/01
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As the table rotates, the position and orientation of a workpiece fixed on
the table change. However, programmed positions are specified in the
coordinate system fixed on the table (programming coordinate system).
Because the programming coordinate system does not move with respect
to the table, specifying a line with a program generates a straight path as
viewed in the programming coordinate system.
Fig.14.12.1(c) shows how linear interpolation in the programming
coordinate system is performed on a mixed-type machine.
If linear interpolation is specified in this function mode, speed control is
carried out in such a way that tool center point moves at a specified speed
in the programming coordinate system.
Example
Machine configuration: The A-axis is a rotary axis for controlling the tool.
The B-axis is a rotary axis for controlling the table.
Program: Created in the "programming coordinate system"
X’
Y’
Z’
Programming
coordinate system
B
X’
Y’
Z’
Command start
point
Command end point
The cutting path is straight.
Programming
coordinate system
Fig.14.12.1 (c)