Fanuc Power Mate i-D/H Operator Manual

PROGRAMMING
(Common to Power Mate i–D and –H)
6. REFERENCE POSITION
B–63174EN/03
64
Positioning to the intermediate or reference positions are performed at the
rapid traverse rate of each axis.
Therefore, for safety, the tool length compensation should be cancelled
before executing this command.
The coordinates for the intermediate position are stored in the CNC only
for the axes for which a value is specified in a G28 block. For the other
axes, the previously specified coordinates are used.
Example) N1 G28 X40.0 ; Intermediate position (X40.0)
N2 G28 Y60.0 ; Intermediate position (X40.0, Y60.0)
In a system without an absolute–position detector, the second and third
reference position return functions can be used only after the reference
position return (G28) or manual reference position return (see III–3.1) is
made. The G30 command is generally used when the automatic tool
changer (ATC) position differs from the reference position.
In general, it is commanded immediately following the G28 command or
G30. For incremental programming, the command value specifies the
incremental value from the intermediate point.
Positioning to the intermediate or reference points are performed at the
rapid traverse rate of each axis.
When the workpiece coordinate system is changed after the tool reaches
the reference position through the intermediate point by the G28
command, the intermediate point also shifts to a new coordinate system.
If G29 is then commanded, the tool moves to the commanded position
through the intermediate point which has been shifted to the new
coordinate system.
The G28 command is performed same as G30 commands.
G27 command positions the tool at rapid traverse rate. If the tool reaches
the reference position, the reference position return lamp lights up.
However, if the position reached by the tool is not the reference position,
an alarm (No.092) is displayed.
Before a machine coordinate system is established with the first reference
position return after power–on, the manual and automatic reference
position return feedrates and automatic rapid traverse rate conform to the
setting of parameter No.1428 for each axis. Even after a machine
coordinate system is established lupon the completion of reference
position return, the manual reference postiion return feedrate conforms to
the setting of the parameter.
Explanations
Reference position
return (G28)
2nd and 3rd reference
position return (G30)
Return from the
reference position (G29)
Reference position
return check (G27)
Setting of the reference
position return feedrate

Leave a Reply

Your email address will not be published. Required fields are marked *