G28 - Move to Origin (Home)
Description
The G28 command moves specified axes to their origin (home) position. This is a fundamental command for establishing a known reference point for the machine's coordinate system. When executed, the command will move the specified axes to their home position as defined by the machine's configuration.
This command is essential for machine initialization, calibration procedures, and ensuring accurate positioning throughout machining operations. It provides a reliable way to return to a known mechanical reference point.
Syntax
Parameters
| Parameter | Description | Example |
|---|---|---|
| X | Home the X-axis (optional) | G28 X |
| Y | Home the Y-axis (optional) | G28 Y |
| Z | Home the Z-axis (optional) | G28 Z |
Note: If no axes are specified all axes will be homed.
Examples
Home All Axes
Home all three axes simultaneously. This is commonly used during machine startup or when a complete reference is needed.
Home Individual Axis
Home only the Z-axis. This is useful when you need to establish the Z-height reference without disturbing X and Y positions.
Home X and Y Only
Home the X and Y axes while leaving the Z-axis in its current position. Often used when the tool height is already set correctly.
Typical Machine Startup Sequence
A common initialization sequence that homes all axes and sets absolute positioning mode.