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G61 Exact stop mode
Mach3 Mach4 G-code · Mill
Every move decelerates to a full stop at its end point. Gives sharp corners but slow, jerky motion on CAM paths.
Format
G61
Addresses
| Address | What it does |
|---|---|
G61 | No address words |
How it works
Modal, path control group. Cancel with G64.
Example program
G0 G20 G90 G54 G17 G40 G49 G80 (SAFE START, INCH)
T1 M6 (TOOL CHANGE)
S8000 M3 (SPINDLE ON)
G43 H1 Z0.1 (LENGTH OFFSET)
…
T1 M6 (TOOL CHANGE)
S8000 M3 (SPINDLE ON)
G43 H1 Z0.1 (LENGTH OFFSET)
…
The full 9-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- On 3D router or engraving code G61 makes the machine stutter and leave marks. Use G64 for most work.
- Mach3 also has a default path mode in the general config. A G61 or G64 in the program overrides it.
- For a few sharp corners use G9 on Mach4.
Related codes
G61 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Exact stop mode |
| Haas NGC | Exact stop mode |
| Okuma OSP | Exact stop mode on |
| Mitsubishi M70 M80 | Exact stop check mode |
| Brother Speedio | Exact stop mode |
| Fagor 8055 8065 | Multiple machining in a rectangular pattern |
| LinuxCNC Tormach | Exact path mode |
| Centroid CNC12 Acorn | Exact stop mode |
| Hurco WinMax (NC) | Precision cornering, exact stop mode |
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Open G61 in the app All Mach3 Mach4 G-codes