
B–64113EN–1/01
6. INTERPOLATION FUNCTION
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One of the axes (servo axes) controlled by the CNC is assigned as a tool
rotation axis. Either serial spindle or analog spindle can be used as a
workpiece axis (spindle).
Polygonal turning using a servo axis is detailed in the operator’s manual
(for lathe).
This section focuses on supplementary information and examples for the
connection.
A position coder must be mounted on the spindle. However, polygonal
turning requires no additional changes to the spindle connection (See
Section 9.3.).
Polygonal turning uses the position coder feedback signal to control the
positional relationship (cutting position) between the spindle and tool
rotation axis, and the ratio of speed.
Parameter No. 7610 specifies the controlled axis (servo axis) to be used
as the tool rotation axis.
The same parameter setting as for ordinary servo axes applies to the servo
axis connection for polygonal turning except for some parameters.
When the machine is not in the polygonal turning mode, the servo axis
specified as the rotation tool axis functions as a feed axis. So, the servo
axis can be:
· Used as a subspindle under PMC axis control
· Positioned by a move command from a machining program.
However, be careful about the angle to rotate through and feedrate. Read
the operator’s manual (for lathe) and the following examples.
· The following descriptions exemplify typical parameter setting for
polygonal turning using a serial pulse coder (with a million pulse
capability).
→ The parameter setting described here is not a must for polygonal
turning.
→ Specify typical values for parameters unless otherwise stated.
D Tool rotation axis setting
This example uses the CNC’s fourth axis (connected as the Y–axis) as
a rotation tool axis for polygonal turning.
Parameter No. 7610 = 4
(controlled axis number for the tool rotation axis)
The following description assumes that the axis type parameter is set
to the fourth axis.
D Servo parameter setting
Set the servo parameters as listed below:
CMR = 1
DMR = 36/1000
6.9.1
Polygonal Turning
General
D Spindle connection
D Tool rotation axis
(servo axis) connection
D Examples of parameter
setting