
6. REFERENCE POSITION
B–63002EN/01
NC FUNCTION
80
It is possible to return the tool to the floating reference position by
commanding the G30.1.
The floating reference position is located on the machine and can be a
reference position of some sort of machine operation. It is not always a
fixed position but may vary in some cases. The floating reference
position can be set using the soft keys of MDI and can be memorized even
if the power is turned off.
Generally, the position where the tools can be replaced on machining
center, milling machine is a set position on top of the machinery. The
tools cannot be replaced at any machine angle. Normally the tool
replacement position is at any of the No. 1 to No. 4 reference position.
The tool can be restored to these positions easily by G30 command.
However, depending on the machine, the tools can be replaced at any
position as long as it does not contact the work piece.
In lathes, the tool can generally be changed at any position unless it
touches the workpiece or tailstock.
For machinery such as these, in order to reduce the cycle time, it is
advantageous to replace tools at a position as close as possible to the work.
For this purpose, tool replacement position must be changed for each
work shape and this feature can be easily realized by this function.
Namely, the tool replacement position which is suitable for works can be
memorized as the floating reference position and it is possible to return
the tool to the tool replacement position easily by commanding the
G30.1.
G30.1 _ ;
IP
IP
: It is the intermediate point to the floating reference position and is
commanded by an absolute value or an incremental value.
When the G30.1 is commanded, the axis commanded is set to the
intermediate point with rapid traverse at first and then is set to the floating
reference position from the intermediate point with rapid traverse. The
positioning to the intermediate point or to the floating point is performed
at rapid traverse for each axis (non-linear positioning). The floating
reference position return completion signal is output after completing the
floating reference position return.
Y
X
G30.1 G90 X50.0 Y40.0 ;
Intermediate point (50, 40)
Workpiece
Floating reference position
6.6
FLOATING
REFERENCE
POSITION RETURN
(G30.1)
Format
Explanations
Examples