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G64 Constant velocity mode
Mach3 Mach4 G-code · Mill
Mach keeps the feed up through corners. Corners round off a little based on acceleration and feed. This is the normal cutting mode.
Format
G64
Addresses
| Address | What it does |
|---|---|
G64 | No address words |
How it works
Modal, path control group.
Example program
G0 G20 G90 G54 G17 G40 G49 G80 (SAFE START, INCH)
T1 M6 (TOOL CHANGE)
S12000 M3 (SPINDLE ON)
G43 H1 Z0.1 (LENGTH OFFSET)
…
T1 M6 (TOOL CHANGE)
S12000 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
- The Mach manuals show G64 with no P tolerance word. Do not count on a LinuxCNC style G64 P.
- Corner error grows with feed and low acceleration. Raise acceleration in Motor Tuning or slow down for tight work.
- Mach3 general config has CV options such as stopping CV on sharp angles. These change how much corners round.
Related codes
G64 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Cutting mode |
| Haas NGC | Exact stop cancel |
| Okuma OSP | Cutting mode |
| Mitsubishi M70 M80 | Cutting mode |
| Brother Speedio | Cutting mode |
| Siemens 840D 828D | Continuous path mode |
| LinuxCNC Tormach | Path blending |
| Centroid CNC12 Acorn | Smoothing mode or cancel exact stop |
| Hurco WinMax (NC) | Cancel precision cornering |
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Open G64 in the app All Mach3 Mach4 G-codes