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MASSO Documentation
8.12. G28 – Return To Machine Home
CAUTION: This command can be used in different combinations and wrong command can result
in unexpected rapid motion. Depending if the machine is in Absolute or Incremental mode the
behaviour of G28 command will be very different, extra caution should be used when using this
command.
This command is used to move the axis back to the home position of the axis after the machine was
homed. Further axis commands can also be combined with G28 to achieve intermediate position.
Syntax & Parameters
G28 - Only G28 can be used, this will move all axis at rapid back to the home position.
X, Y, Z, A, B Value - specifies the intermediate position you wish to move following the distance to
move. The distance value will be the current machine units in use.
Combining the G28 with a rotary axis in incremental mode G91 will allow the axis to unwind in 1
revolution or less. See example below.
Example program for moving all together axis to home position
N10 G28
The above gcode will move all axis of the machine at rapid back to the home position.
Example program all axis to machine 0.00
N10 G91 G28 X0 Y0 Z0
The above gcode will move all axis to machine 0.00 as there is no intermediate position to go to first.
Example program to move Z axis first
N10 G91 G28 X0 Y0 Z8
The above gcode will first move the Z axis to 8.00 position and then move all axis to machine 0.00
Rotary Axis Unwind within one rotation
v5.18 - 08 Apr,2021
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