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G28 Return to reference point
Brother Speedio G-code · Mill
Moves through an intermediate point to the machine reference point.
Format
G28 X Y Z
Addresses
| Address | What it does |
|---|---|
X Y Z | Intermediate point. G91 with zero means go straight home |
How it works
Non-modal.
Example program
G00 Z1. (CLEAR PART)
G91 G28 Z0 (Z HOME STRAIGHT UP)
G28 X0 Y0 (XY HOME)
G90 (BACK TO ABSOLUTE)
G91 G28 Z0 (Z HOME STRAIGHT UP)
G28 X0 Y0 (XY HOME)
G90 (BACK TO ABSOLUTE)
Example is in inch. Check offsets and clearances first.
Watch out for
- Use G91 G28 Z0 for a safe home. G90 G28 Z0 goes through work Z0 first and can crash.
- Speedio tool changes are done by the tool change command, so G28 is not needed before a tool change.
Related codes
G28 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Return to reference position |
| Haas NGC | Return to machine zero |
| Mazak (EIA) | Reference point return |
| Mitsubishi M70 M80 | Return to reference position |
| Heidenhain TNC (ISO) | Mirror image |
| LinuxCNC Tormach | Go to stored position 1 |
| Mach3 Mach4 | Return to home through a point |
| Centroid CNC12 Acorn | Return to reference point 1 |
| Hurco WinMax (NC) | Return to reference point |
| Fadal | Return to zero |
| Swiss (Citizen Star) | Return to reference point |
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