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G76 Fine boring cycle / Automatic rounding
Okuma OSP G-code · Mill, Lathe
On mills: Fine boring cycle
Bores to depth, orients the spindle, shifts the tool off the wall and retracts so the bore is not scratched.
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 | Bore depth |
R | R point |
F | Feed rate |
How it works
Modal, fixed cycle group. Cancel with G80.
Example program
N1 G15 H1 (WORK COORDINATE SYSTEM 1)
N2 T8 M06 (FINISH BORING BAR)
N3 G00 G90 X2. Y1. S900 M03 (BORE CENTER)
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Set the boring bar tip facing the right way after spindle orient or it shifts into the wall.
- Shift amount and direction words differ by control. Check the manual.
On lathes: Automatic rounding
Adds a corner radius at the end of a G01 move, sized by L. Works like G75 but gives a radius.
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 | X end point, or Z, only one axis |
L | Corner radius, sign gives the direction |
F | Feed rate |
How it works
One shot. Works only in G01 mode.
Example program
N1 G50 S3000 (MAX SPINDLE 3000 RPM)
N2 G00 X1.8 Z.1 T010101 (START)
N3 G96 S500 M03 (500 SFM)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Okuma lathe G76 is not a threading cycle. Use G71 for multi pass threads.
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 |
| 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 |
| Swiss (Citizen Star) | Multiple pass threading cycle |
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