G28: Rapid Move to Reference (Zero) position

Overview

Returns all or only selected axes to home (zero) position via an optional intermediate point.

Syntax: G28 <Axis>... <Axis>... F...
Sequence:
- With no axes specified:
  - X, Y, Z go to Machine Coordinate Position 0.
- With axes specified on command line:
  1. Specified axes move to the given positions in the Local Coordinate System .
    - This LCS move obeys the current G90 and G91 Absolute and Incremental Mode positioning type.
    - i.e. G28 X10 Y10 commands identical motion to G00 X10 Y10 in this step.
  2. Specified axes move to Machine Coordinate Position 0.
    - This is a absolute positioning move in MCS.

G28 X10 Y15 Z20
1. Moves X=10 Y=15 Z=20 in LCS.
2. Then moves MCS to X=0 Y=0 Z=0.
G28 X10 Y10
1. Moves LCS X=10 Y=15 in LCS. Z axis is stationary.
2. Then moves MCS to X=0 Y=0. Z axis is stationary.
G28 G91 X0 Y0 Z10
1. Moves Z axis up by 10 units (X and Y axes move by 0 units)
2. Then moves to the X=0 Y=0 Z=0 positiion.
G28 G91 Z10
1. Moves Z axis up by 10 units
2. Then moves to Z=0 position. X and Y axes are stationary.
G28
1. Performs a single move directly to X=0 Y=0 Z=0 position.

If feedrate F is not specified on the command line, then the command is executed at the Max Rapid feedrate.