FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

PROGRAMMING
8. COORDINATE SYSTEM
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112
A coordinate system used for machining a workpiece is referred to as a
workpiece coordinate system. A workpiece coordinate system is to be set
with the CNC beforehand (setting a workpiece coordinate system).
A machining program sets a workpiece coordinate system (selecting a
workpiece coordinate system).
A set workpiece coordinate system can be changed by shifting its origin
(changing a workpiece coordinate system).
A workpiece coordinate system can be set using one of three methods:
(1) Method using G92
A workpiece coordinate system is set by specifying a value after G92
in the program.
(2) Automatic setting
If bit 0 of parameter SPR No. 1201 is set beforehand, a workpiece
coordinate system is automatically set when manual reference
position return is performed (see Part III–3.1.).
(3) Input using the CRT/MDI panel
Six workpiece coordinate systems can be set beforehand using the
CRT/MDI panel (see Part III–11.4.6.).
When using an absolute command, establish the workpiece
coordinate system in any of the above ways.
(G90) G92 IP_
IP
A workpiece coordinate system is set so that a point on the tool, such as
the tool tip, is at specified coordinates. If a coordinate system is set using
G92 during tool length offset, a coordinate system in which the position
before offset matches the position specified in G92 is set.
Cutter compensation is cancelled temporarily with G92.
25.2
X
Z
23.0
0
X
Z
600.0
1200.0
If an absolute command is is-
sued, the base point moves to
the commanded position. In
order to move the tool tip to the
commanded position, the dif-
ference from the tool tip to the
base point is compensated by
tool length offset.
Setting the coordinate system by the
G92X25.2Z23.0; command
(The tool tip is the start point for the program.)
Setting the coordinate system by the G92X600.0Z1200.0; command
(The base point on the tool holder is the start point for the program.)
Base point
Example 1
Example 2
0
8.2
WORKPIECE
COORDINATE
SYSTEM
8.2.1
Setting a Workpiece
Coordinate System
Format
D Setting a workpiece
coordinate system by G92
Explanations
Examples

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