
6.REFERENCE POSITION NC FUNCTIONS B-63322EN/03
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6.6 FLOATING REFERENCE POSITION RETURN (G30.1)
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 workpiece.
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.
Format
G30.1 IP_;
IP : Command of the intermediate position of the floating
reference position
Explanation
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.