
B–64113EN–1/01
4. REFERENCE POSITION ESTABLISHMENT
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← Operation 1 →← Operation 2 →
X–axis
Rapid traverse rate
Y–axis
FL feedrate
Z–axis
No movement
Time
Fig. 4.8 (d) When an axis does not require the reference position establishment operation and others require the
establishment operation
As explained in step <4>, after the reference position has been
established, positioning to a specified end point is performed. This
operation is explained below.
(1)When an absolute command is specified
Movement to the end point in the new coordinate system that has been
established in step <3> is made. For example, when G90 G00
Xxx.Yyy.; (for the M series) or G00 Xxx.Zyy.; (for the T series) is
specified, the tool moves as indicated with the bold line in the figure
below. Note that, however, the figure shows the positional
relationship among points and that the intermediate tool path is not
always of the linear interpolation type.
Actual end point ((xx,yy) in the coordinate system after the
reference position is established)
Start point
Workpiece origin offset
(New) workpiece coordinate system (accurate coordinate
system) after the reference position is established
(New) machine coordinate system (accurate coordinate system)
after the reference position is es-
tablished
Difference between the machine coordinate system at power–on and the
machine coordinate system after the reference position is established (a,b)
Position at which the refer-
ence position is estab-
lished
Specified end point (xx,yy)
Workpiece coordinate system before the reference position is established
(inaccurate coordinate system)
Machine coordinate system before the reference position is established
(inaccurate coordinate system)
Workpiece origin offset
Fig. 4.8 (e) Operation when an absolute command is specified
D Absolute command and
incremental command