CNC Machinist Calculator UltraG88 Boring cycle, manual retract / Side tapping cycle
Fanuc G-code · Mill, Lathe
On mills: Boring cycle, manual retract
Feeds to Z, dwells, then stops the spindle and the program so the operator can back the tool out by hand. The cycle then continues to the return level.
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 where feed starts |
P | Dwell at bottom, milliseconds |
F | Feed rate |
K | Number of repeats |
How it works
Modal, group 09. Cancel with G80 or any group 01 code.
Example program
G90 G54 G00 X2. Y1.5 S600 M03 (BORE CENTER)
G43 H10 Z1. M08 (CLEARANCE)
G98 G88 Z-1. R.1 P500 F3. (BORE THEN MANUAL RETRACT)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- The operator must switch to a manual mode, move the tool out, then return to auto and press cycle start.
- Rare today. Mostly used for special boring heads.
On lathes: Side tapping cycle
Taps along X into the side of the part with a radial live tool. With M29 first it runs as rigid tapping.
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 |
|---|---|
Z C | Hole position along the part and angle |
X | Hole bottom as a diameter |
R | R point |
P | Dwell at the bottom |
F | Pitch in G99, or RPM times pitch in G98 |
K | Repeat count |
How it works
Modal, group 10. Cancel with G80.
Example program
G99 (FEED PER REV)
G00 Z-.5 C0 X2.3 M08 (FIRST HOLE)
M29 S400 (RIGID TAP MODE)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Match the feed mode to the F value. Pitch in G99, RPM times pitch in G98.
- R is often the distance from the start point to the R point, not an absolute Z. Check on your machine.
- Cancel with G80 when done.
Related codes
G86 · G80 · G98 · G99 · G84 · G87
G88 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Boring cycle, dwell and manual retract |
| Mazak (EIA) | Side tapping cycle, live tool |
| Okuma OSP | LAP continuous thread cutting cycle |
| Mitsubishi M70 M80 | Boring cycle, manual retract |
| Brother Speedio | Boring cycle with manual retract |
| Fagor 8055 8065 | Circular pocket canned cycle |
| LinuxCNC Tormach | Boring cycle, manual out, not implemented |
| Mach3 Mach4 | Bore, manual retract |
| Hurco WinMax (NC) | Rigid tap (BNC) or bore manual out (ISNC) |
| Fadal | Bore in, dwell, bore out |
| Swiss (Citizen Star) | Side tapping cycle |
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