FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
8. COORDINATE SYSTEM
B–62754EN/01
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The workpiece coordinate system preset function presets a workpiece
coordinate system shifted by manual intervention to the pre–shift
workpiece coordinate system. The latter system is displaced from the
machine zero point by a workpiece zero point offset value.
There are two methods for using the workpiece coordinate system preset
function. One method uses a programmed command (G92.1). The other
uses MDI operations on the absolute position display screen, relative
position display screen, and overall position display screen (
III – 11.1.4).
G92.1 IP 0 ;
IP 0 ; Specifies axis addresses subject to the workpiece
coordinate system preset operation. Axes that are
not specified are not subject to the preset operation.
(
G50.3 P0 ; for G code system A)
When manual reference position return operation is performed in the reset
state, a workpiece coordinate system is shifted by the workpiece zero
point offset value from the machine coordinate system zero point.
Suppose that the manual reference position return operation is performed
when a workpiece coordinate system is selected with G54. In this case,
a workpiece coordinate system is automatically set which has its zero
point displaced from the machine zero point by the G54 workpiece zero
point offset value; the distance from the zero point of the workpiece
coordinate system to the reference position represents the current position
in the workpiece coordinate system.
G54 workpiece coordinate system
Reference position
Manual reference position return
Reference position
G54 workpiece zero
point offset value
If an absolute position detector is provided, the workpiece coordinate
system automatically set at power–up has its zero point displaced from
the machine zero point by the G54 workpiece zero point offset value. The
machine position at the time of power–up is read from the absolute
position detector and the current position in the workpiece coordinate
system is set by subtracting the G54 workpiece zero point offset value
from this machine position. The workpiece coordinate system set by
these operations is shifted from the machine coordinate system using the
commands and operations listed next page.
(a) Manual intervention performed when the manual absolute signal is off
(b) Move command executed in the machine lock state
(c) Movement by handle interrupt
(d) Operation using the mirror image function
(e) Setting the local coordinate system using G52, or shifting the
workpiece coordinate system using G92
8.2.4
Workpiece Coordinate
System Preset (G92.1)
Format
Explanations

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