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G86 Boring, rapid withdrawal / Longitudinal threading cycle (lathe)
Fagor 8055 8065 G-code · Mill, Lathe
On mills: Boring, rapid withdrawal
Feeds to depth I, stops the spindle, and withdraws in rapid. Q orients the spindle and D E shift the bar off the wall before withdrawal.
Format
Addresses
| Address | What it does |
|---|---|
G98 or G99 | Return to initial plane or reference plane |
X Y | Hole position |
Z | Reference plane, absolute or incremental from the initial plane |
I | Depth, absolute or incremental from the reference plane |
K | Dwell in hundredths of a second |
Q | Spindle angle for withdrawal |
D E | Shift off the wall in X and Y |
How it works
Modal canned cycle. Cancel with G80.
Example program
G00 G90 X1.0 Y1.0 Z1.0 S900 M03 (ABOVE BORE)
G86 G98 Z0.1 I-1.0 Q0 D-0.01 F3.0 (BORE, ORIENT, SHIFT, RAPID OUT)
G80 (CANCEL CYCLE)
Example is in inch. Check offsets and clearances first.
Watch out for
- Without Q D E the bar can drag a line on the way out.
- Check the shift direction against the boring bar tip before running.
On lathes: Longitudinal threading cycle (lathe)
Cuts a straight or taper thread along Z in several passes. I is thread depth, B first pass depth, E minimum pass, L finish pass, C pitch, A infeed angle.
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 start point |
Q R | Thread end point |
I | Thread depth, sign gives OD or ID |
B | First pass depth |
E | Minimum pass depth |
D | Safety distance |
L | Finish pass |
C | Thread pitch |
J | Thread exit |
A | Infeed angle |
How it works
Not modal.
Example program
G97 S600 M03 (RPM MODE FOR THREADING)
G86 X1.0 Z0.2 Q1.0 R-1.0 I-0.0406 B0.01 E0.002 D0.04 L0.001 C0.0625 A29.5 (1 INCH 16 TPI)
G00 X2.0 Z1.0 (CLEAR)
Example is in inch. Check offsets and clearances first.
Watch out for
- C is the pitch. 8 TPI is C0.125.
- On Fagor mills G86 is a boring cycle.
- Check the sign of I in your manual. It sets outside or inside thread.
Related codes
G86 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Boring cycle, spindle stop |
| Haas NGC | Boring cycle, spindle stop and rapid out |
| Okuma OSP | Boring cycle, spindle stop |
| Mitsubishi M70 M80 | Boring cycle, spindle stop out |
| Brother Speedio | Boring cycle spindle stop |
| LinuxCNC Tormach | Boring cycle, spindle stop, rapid out |
| Mach3 Mach4 | Bore, spindle stop, rapid out |
| Hurco WinMax (NC) | Bore rapid out (ISNC) or bore orient (BNC) |
| Fadal | Bore in, spindle off, rapid out |
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