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G76 Fine boring cycle / Multi pass threading cycle
Centroid CNC12 Acorn G-code · Mill, Lathe
On mills: Fine boring cycle
Bores to depth, orients the spindle with M19, shifts off the wall by Q and rapids out. Parameter 136 sets the shift direction.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
Q | Shift away from the wall at the bottom |
F | Feed rate |
How it works
Modal, canned cycle. Cancel with G80.
Example program
T1 M6 ; LOAD TOOL 1, Z GOES HOME FIRST
G54 G0 X0 Y0 ; WORK OFFSET 1
S800 M3
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Needs a custom M19 orient macro and a spindle that can orient. Ask the machine builder before using it.
- Parameter 136 is the shift angle. Zero means plus Y. Point the boring bar tip the opposite way.
On lathes: Multi pass threading cycle
Cuts a full thread in passes that get smaller as the depth grows. Start point is where the tool sits. Defaults for spring passes, chamfer, angle, minimum cut and finish come from parameters 49 to 53.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
Addresses
| Address | What it does |
|---|---|
X Z | Thread root diameter and end of thread |
P | Thread height |
Q | First cut depth |
R | Taper amount |
F E | Thread lead |
How it works
One shot. Values given stay as the modal defaults.
Example program
G97 S600 M3 ; RPM MODE FOR THREADING
G0 X1.1 Z.25 M8 ; START POINT
G76 X.8466 Z-1.5 P.0767 Q.015 F.125 ; 1-8 THREAD
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- A one line form uses K for thread height and D for first cut. Unlisted values come from parameters 49 to 53.
- For a multi start thread, shift the start Z by the lead divided by the starts for each new G76.
- Type a decimal point on P, Q and D values.
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 |
| Hurco WinMax (NC) | Fine boring with orient |
| Fadal | Fine boring with oriented shift |
| Swiss (Citizen Star) | Multiple pass threading cycle |
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