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GSK983Ta Turning CNC System User Manual
to reference position by the “manual reference position return”.
G27 command is employed to determine whether the tool has reached to reference position, this
reference position is specified in programming, if the reference point specified is not coincident with
that of machine, No.092 alarm occurs.
Format: G27X（u）— Z(w)—;
When the above commands are employed, the tool moves to the specified position at the rapid
traverse rate. If tool reaches the reference position, the indicator of reference position is ON. If only
one axis reaches the reference position, the indicator of this axis’s reference position return is ON. If
the specified axis not reached there, the alarm occurs (No. 092)
Chapter 2
Note 1: If an offset value is specified, a specified position reaches by G27 command will move an offset
value. If a tool offset is not reach the reference position, the corresponding light is OFF. Usually,
the offset should be erased before G27 is specified.
Note 2: The inch mechanical system is entered in metric, even if the tool programming position is offset
Programming
1µ from reference position, and the indicator light is also ON. The min. input value is less than the
command incremental of mechanical system.
st
Note 3: G27 function just for the 1 reference position of machine.
2.5.8.2
G28 Automatic Reference Position Return
Format: G28 X（u）— Z（w）—；
Function: Auto reference position return is specified by this command (for the specified axis).
Positioning to the reference position is determined by the intermediate point specified by the X(u)_
Z(w).
Tool moves to intermediate point on all specified axes at rapid traverse rate after G28 block is
employed, rapid traverse reference position return is then performed. Reference position return
indicator light is ON, if it is not on the state of machine lock.
Positioning to the intermediate point or reference position, it is same effective to position with
G00.
In general, this command is used for automatic tool change (ATC). Therefore, for safety, tool
nose compensation and tool offset should be cancelled before executing this command.
Note 1: Before G28 command is specified, if a manual reference position return is not performed, after
the power is turned on, the movement after the intermediate is same with manual reference
position return. In this case, the direction from intermediate return selected by parameter #12 is
equal to reference position return.
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