LSIS XGT Series - Page 532

Chapter 9 NC Control Function
9-29
Y
X
50
70
Workpiece coordinate
Alarm
G90
G27 X-50. Y0.
G90
G27 X-50. Y-70.
11) Auto-homing (G28)
(G90, G91) G28 X_ Y_ Z_ A_ B_ C_ U_ V_ W_ S_
G90, G91: Absolute/Incremental command
G28: Auto-homing command
X_ Y_ Z_ A_ B_ C_ U_ V_ W_ S_: Coordinate of waypoint of each axis to be homed
It is the command to automatically return the axis to the machine reference point. When the G28 command is
encountered during the program execution, each axis is moved to the machine origin at the rapid traverse rate. At
this time, it stops by the commanded position of each axis on the way.
Y
X
-100 100 200
100
200
Machine origin
Waypoint
Current point
The axes without receiving the auto-homing command do not move.
The incremental commands are available for axis positioning.
If the axis position command is "0", it returns directly to the machine origin without dropping by waypoints.