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G61 Exact stop mode
Haas NGC G-code · Mill, Lathe
On mills: Exact stop mode
Makes every move come to a full stop at the end point before the next move. Gives sharp corners but slows the cycle.
Format
G61
How it works
Modal, group 15. Cancel with G64.
Example program
G61 (EXACT STOP ON)
G01 X2. Y0. F20. (SHARP CORNER)
Y1. (SHARP CORNER)
G64 (EXACT STOP OFF)
G01 X2. Y0. F20. (SHARP CORNER)
Y1. (SHARP CORNER)
G64 (EXACT STOP OFF)
Example is in inch. Check offsets and clearances first.
Watch out for
- G61 can leave dwell marks on contours. Use it only where needed.
On lathes: Exact stop mode
Makes every move decelerate to an exact stop before the next block. Corners come out sharp but cycle time goes up.
Format
G61
How it works
Modal, group 15. Cancel with G64.
Example program
G61 (EXACT STOP ON)
G01 Z-1. F.006 (TURN TO SHOULDER)
X1.5 (FACE SHOULDER, SHARP CORNER)
G64 (BACK TO NORMAL CUTTING)
G01 Z-1. F.006 (TURN TO SHOULDER)
X1.5 (FACE SHOULDER, SHARP CORNER)
G64 (BACK TO NORMAL CUTTING)
Example is in inch. Check offsets and clearances first.
Watch out for
- Stopping at every point can leave dwell marks on the part.
- Use G09 for a single block instead.
Related codes
G61 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | 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 |
| Mach3 Mach4 | Exact stop mode |
| Centroid CNC12 Acorn | Exact stop mode |
| Hurco WinMax (NC) | Precision cornering, exact stop mode |
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