CNC Machinist Calculator UltraG89 Boring cycle, dwell and feed out / Side boring cycle
Fanuc G-code · Mill, Lathe
On mills: Boring cycle, dwell and feed out
Like G85 but dwells at the bottom before feeding out. Used for boring to a flat shoulder.
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 in and out |
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 S1000 M03 (BORE CENTER)
G43 H08 Z1. M08 (CLEARANCE)
G98 G89 Z-.5 R.1 P300 F4. (BORE TO SHOULDER, DWELL)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- P is in milliseconds without a decimal point.
- Feeding out with the spindle on can leave a spiral mark. Use G76 for a clean finish.
On lathes: Side boring cycle
Feeds in along X and feeds back out on the side of the part with a radial live tool. Used for reaming and boring cross holes.
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 | Feed |
K | Repeat count |
How it works
Modal, group 10. Cancel with G80.
Example program
G98 (FEED PER MINUTE)
G00 Z-.5 C0 X2.2 M08 (POSITION)
G89 X1.4 R-.1 P200 F6. (REAM, SHORT DWELL)
…
The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- G89 is the side boring cycle. G85 is the face version.
- 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
G85 · G82 · G80 · G98 · G99 · G87
G89 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Boring cycle, dwell and feed out |
| Mitsubishi M70 M80 | Boring cycle with dwell, feed out |
| Brother Speedio | Boring cycle with dwell feed out |
| Fagor 8055 8065 | Boring, feed withdrawal |
| LinuxCNC Tormach | Boring cycle, dwell, feed out |
| Mach3 Mach4 | Bore, dwell, feed out |
| Centroid CNC12 Acorn | Boring cycle with dwell |
| Hurco WinMax (NC) | Bore with dwell, feed out |
| Fadal | Bore in, dwell, bore out |
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