4. The Inventory Browser
Zero Points
Zero Points define the coordinate system origins for the CNC program, allowing you to correctly position the workpiece relative to the machine.
Fundamental Concepts
Machine Coordinate System
The Machine Coordinate System (MCS) is the absolute reference of the CNC machine:
- Machine origin - Fixed point defined by manufacturer
- Home position - Reference position after homing
- Absolute coordinates - Measured from machine origin
Workpiece Coordinate System
The Workpiece Coordinate System (WCS) is the programming reference:
- G54-G59 - Standard work offsets (up to 6)
- G54.1 Pxx - Extended offsets (up to 99 or more)
- Offset - Distance between machine origin and work origin
Setting Zero Points
In the Inventory Browser
- Open the Inventory Browser (F4)
- Go to the "Zero Points" section
- Select the coordinate system (G54, G55, etc.)
- Set the X, Y, Z coordinates
- Confirm with double-click
Typical Positioning
| Type | Typical Position |
|---|---|
| Milling | Center or corner of top surface |
| Turning | Center of workpiece front face |
Important: Ensure the program origin matches the origin set on the real machine before machining.
Tool Offset and Zero
Zero points work together with tool offsets:
- Length offset (H) - Compensates tool length
- Radius offset (D) - Compensates tool radius
- Wear - Compensations for tool wear