CNC Machinist Calculator UltraHome › G-codes › Mitsubishi M70 M80 › G76
G76 Fine boring cycle / Compound thread cutting cycle
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: Fine boring cycle
Bores, stops the spindle oriented at the bottom, shifts off the wall by Q, then rapids out without a drag line.
Format
G76 X Y Z R Q P F
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
Q | Shift amount at bottom |
P | Dwell |
F | Feed rate |
How it works
Modal, canned cycle group 09. Cancel with G80.
Example program
G90 G54 G00 X2. Y2. S900 M03 (BORE START)
G43 H08 Z1. M08 (LENGTH COMP)
G98 G76 Z-1. R.1 Q.01 F4. (FINE BORE)
G80 G00 Z1. (CANCEL)
G43 H08 Z1. M08 (LENGTH COMP)
G98 G76 Z-1. R.1 Q.01 F4. (FINE BORE)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Shift direction is set by a parameter. Set the boring bar tip to face the right way after orient or it gouges the bore.
- Q is a shift distance here, not a peck.
On lathes: Compound thread cutting cycle
Cuts a full thread in many passes with infeed angle, from one or two blocks.
Format
G76 P Q R then G76 X Z R P Q F
Addresses
| Address | What it does |
|---|---|
P first block | Finish passes, chamfer, tool angle, 2 digits each |
Q first block | Minimum cut depth |
R first block | Finish allowance |
X Z | Thread end point, X is minor diameter |
R second block | Taper amount |
P second block | Thread height |
Q second block | First cut depth |
F | Lead |
How it works
Non-modal, group 00.
Example program
G97 S800 M03 (.500-13 THREAD)
G00 X.6 Z.25 (START POINT)
G76 P011060 Q20 R.001 (CYCLE SETTINGS)
G76 X.4056 Z-.75 P472 Q120 F.07692 (THREAD)
…
G00 X.6 Z.25 (START POINT)
G76 P011060 Q20 R.001 (CYCLE SETTINGS)
G76 X.4056 Z-.75 P472 Q120 F.07692 (THREAD)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Run in G97. Leave enough Z start distance for the axis to speed up.
- P and Q in the second block are in least units without decimal point on many machines.
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 |
| 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 |
Every G-code for Mitsubishi M70 M80 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 Mitsubishi M70 M80 G-codes