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G44 Tool length offset minus
Mach3 Mach4 G-code · Mill
Applies tool table entry H in the negative direction. Kept for compatibility with tables that hold negative lengths.
Format
G44 H [Z]
Addresses
| Address | What it does |
|---|---|
H | Tool table entry |
Z | Optional move in the same block |
How it works
Modal, length offset group. Cancel with G49.
Example program
G0 G20 G90 G54 G17 G40 G49 G80 (SAFE START, INCH)
T2 M6 (TOOL CHANGE)
S5000 M3 (SPINDLE ON)
G44 H2 Z1.0 (NEGATIVE LENGTH OFFSET)
…
T2 M6 (TOOL CHANGE)
S5000 M3 (SPINDLE ON)
G44 H2 Z1.0 (NEGATIVE LENGTH OFFSET)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Almost never needed. Using G44 with normal positive offsets sends the tool the wrong way by twice the length.
Related codes
G44 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Tool length compensation minus |
| Haas NGC | Tool length compensation minus |
| Mitsubishi M70 M80 | Tool length comp minus |
| Brother Speedio | Tool length offset minus |
| Fagor 8055 8065 | Tool length compensation cancel |
| Centroid CNC12 Acorn | Tool length compensation minus |
| Hurco WinMax (NC) | Tool length offset minus |
| Fadal | Tool length compensation negative |
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Open G44 in the app All Mach3 Mach4 G-codes