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G76 Multiple pass threading cycle
Swiss (Citizen Star) G-code · Lathe
Cuts a full thread in many passes from two blocks. The normal way to thread on Citizen and Star.
Format
G76 P Q R | G76 X Z R P Q F
Addresses
| Address | What it does |
|---|---|
P first | Finish passes, chamfer, angle, six digits |
Q first | Minimum cut depth |
X Z | Thread root and end |
P second | Thread height |
Q second | First pass depth |
F | Lead |
How it works
One shot.
Example program
G97 M3 S1=1500 (CITIZEN MAIN RPM)
G00 X.3 Z-.2 T0400 (THREAD TOOL)
G76 P020060 Q.001 R.001
G76 X.2052 Z.5 P.0307 Q.008 F.05 (.250-20 UNC)
…
G00 X.3 Z-.2 T0400 (THREAD TOOL)
G76 P020060 Q.001 R.001
G76 X.2052 Z.5 P.0307 Q.008 F.05 (.250-20 UNC)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Thread toward the bushing when you can so the support is close at the end of the thread.
- Spindle speed must be G97 constant RPM.
Related codes
G76 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Fine boring cycle |
| Haas NGC | Fine boring cycle |
| Mazak (EIA) | Fine boring cycle |
| Okuma OSP | Fine boring cycle |
| Mitsubishi M70 M80 | Fine boring cycle |
| Brother Speedio | Fine boring cycle |
| Fagor 8055 8065 | Probing move while touching |
| LinuxCNC Tormach | Lathe multi pass threading |
| Mach3 Mach4 | Fine boring, Mach4 |
| Centroid CNC12 Acorn | Fine boring cycle |
| Hurco WinMax (NC) | Fine boring with orient |
| Fadal | Fine boring with oriented shift |
Every G-code for Swiss (Citizen Star) in your pocket. The app has the full example programs, search by number or shop word, a line decoder and calculators for tapping, threading and drilling.
Open G76 in the app All Swiss G-codes