
B–63294EN/02
2. MACHINING MENU DESCRIPTIONS
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2.12.4.2 Left–handed coordinate system capability
(1) Outline
U–axis machining assumes that, when a machining program is created, a figure is specified using the
right–handed coordinate system (ZU plane) and that the machining operation of the machining program
is also performed using the same coordinate system. However, some machines use the left–handed coor-
dinate system. To enable the support of such machines, the system is provided with the capability to con-
vert from the right–handed to the left–handed coordinate system in NC statement output.
+U
+Z
–U
+Z
Right–handed coordinate system Left–handed coordinate system
When a machining program is created, contour data can be specified in the right–handed coordinate sys-
tem, as usual. Then, by setting the following parameter, the machining program is automatically converted
to the left–handed coordinate system at NC statement output. Accordingly, the actual machining per-
formed by the machine always conforms to the NC format program.
#7 #6 #5 #4 #3 #2 #1 #0
9133 CVL
NC statement output CVL=0: Does not perform conversion to the left–handed coordinate system.
CVL=1: Performs conversion to the left–handed coordinate system.
(Note that this setting is valid only when GRO=1.)
Smallest tool management number of the tools used
9236
in the left–handed coordinate system
Largest tool management number of the tools used
9237
in the left–handed coordinate system
(2) Machining program conversion
A machining program created in conversational mode is converted to an NC format program as described
below.
1) Axis commands in the U direction
The signs of all axis commands in the U direction are inverted.
2) G code commands
All G codes, related to coordinate planes in a machining program, are converted as follows:
G02 ³ G03
G03 ³ G02
G41 ³ G42
G42 ³ G41