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Section Section 44 System ProgrammingSystem Programming
5353
If the move contains positive Z movement, the machine first moves up in the Z
axis and then moves across in the XY plane. If the move contains negative Z
movement, the machine first moves across in the XY plane and then moves down
in the Z axis.
If you want the G28 command to move only one or two axes, you can limit the
movement to those axes by adding the parameters “X0”, “Y0”, or “Z0” after the
G28 command. Then, LC moves only the indicated axes to their Tool Change
Position coordinates. A typical use is to only raise the Z axis for a manual tool
change (“G28 Z0”).
Example:
The Tool Change Position is defined as Machine Coordinate X=1, Y=1, Z=-1.
G01 X1.5 Y2.5 Z-3 F10 Linear move to the Program Coordinate
X=1.5, Y=2.5, Z=-3
G28 Z0 Rapid move in the Z axis only to Machine
Coordinate Z=-1
G01 X1.5 Y2.5 Z-3 F10 Linear move to the Program Coordinate
X=1.5, Y=2.5, Z=-3
G28 Rapid move in the Z axis to Machine
Coordinate Z=-1 followed by a rapid move
in the XY plane to Machine Coordinate
X=1, Y=1
G01 X1.5 Y2.5 Z-3 F10 Linear move to the Program Coordinate
X=1.5, Y=2.5, Z=-3
G28 X0 Y0 Z0 Rapid move in the Z axis to Machine
Coordinate Z=-1 followed by a rapid move
in the XY plane to Machine Coordinate
X=1, Y=1 (identical to the G28 command
with no parameters specified)
G29 Return from Reference Point
The G29 command moves the tool to the designated XYZ coordinate at the rapid
rate.
If the move contains positive Z movement, the machine first moves up in the Z
axis and then moves across in the XY plane. If the move contains negative Z
movement, the machine first moves across in the XY plane and then moves down
in the Z axis.
Example:
The Tool Change Position is defined as Machine Coordinate X=1, Y=1, Z=-1.
G01 X1.5 Y2.5 Z-3 F10 Linear move to the program coordinate
X=1.5, Y=2.5, Z=-3