
B-63944EN/02 PROGRAMMING 6.REFERENCE POSITION
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6.2 FLOATING REFERENCE POSITION RETURN (G30.1)
Tools ca be returned to the floating reference position.
A floating reference point is a position on a machine tool, and serves
as a reference point for machine tool operation.
A floating reference point need not always be fixed, but can be moved
as required.
Format
G30.1 IP_;
IP_ : Specify the intermediate position to the floating
reference position in the absolute coordinate system.
(absolute/incremental command)
Explanation
Generally speaking, on a machining center or milling machine, cutting
tools can be replaced only at specific positions. A position where tools
can be replaced is defined as the second or third reference point. Using
G30 can easily move the cutting tools back to these points.
On some machine tools, the cutting tools can be replaced at any
position unless they interfere with the workpiece. With these
machines, the cutting tools should be replaced at a position as close to
the workpiece as possible so as to minimize the machine cycle time.
For this purpose, the tool change position is to be changed, depending
on the figure of the workpiece. This operation can easily be
performed using this function.
That is, a tool change position suitable for the workpiece is
memorized as a floating reference point. Then command G30.1 can
easily cause return to the tool change position.
A floating reference point becomes a machine coordinate position
memorized by pressing the soft key [SET FRP] on the current
positions display screen. The coordinates of the floating reference
position are stored with parameter No. 1244.
The G30.1 block first positions the tool at the intermediate point along
the specified axes at rapid traverse rate, then further moves the tool
from the intermediate point to the floating reference point at rapid
traverse rate. Before using G30.1, cancel the compensation functions,
such as cutter compensation and tool length compensation.
A floating reference point is not lost even if power is turned off.
The function for movement from the reference position (G29) can be
specified for moving the tool from the floating reference position.