G88 Circular pocket canned cycle / Grooving cycle along X (lathe)

Fagor 8055 8065 G-code · Mill, Lathe

On mills: Circular pocket canned cycle

Mills a round pocket centered on X Y. J is the pocket radius. B is the depth step, C the side step, L finishing stock, H finishing feed, V plunge feed.

Format

G88 G98 X Y Z I J B [C] [D] [H] [L] [V]

Addresses

Address	What it does
`Z`	Reference plane
`I`	Pocket depth
`J`	Pocket radius, sign sets direction
`B`	Depth step
`C`	Side step
`D`	Reference plane to surface distance
`H L`	Finishing feed and finishing stock
`V`	Plunge feed

How it works

Modal canned cycle. Cancel with G80.

Example program

T1 D1 M06 (END MILL 0.5)
G0 G90 X0 Y0 Z1.0 S3000 M03 (START)
G88 G98 X2.0 Y2.0 Z0.1 I-0.4 J0.75 B0.1 C0.2 D0.05 H15.0 L0.01 V5.0 F20.0 (1.5 DIA POCKET)
G80 (CANCEL CYCLE)

Example is in inch. Check offsets and clearances first.

Watch out for

J is the radius, not the diameter.
On Fanuc G88 is a boring cycle. On Fagor mills it is a circular pocket.

On lathes: Grooving cycle along X (lathe)

Cuts a groove plunging along X, stepping over with C between plunges, from X Z to Q R.

Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.

Format

G88 X Z Q R [C] [D] [K]

Addresses

Address	What it does
`X Z`	Start corner of the groove
`Q R`	End corner of the groove
`C`	Step between plunges
`D`	Safety distance
`K`	Dwell at bottom

How it works

Not modal.

Example program

T4 D4 (GROOVE TOOL 0.125 WIDE)
G95 G97 S800 M03 (RPM MODE)
G88 X1.5 Z-1.0 Q1.2 R-1.25 C0.1 D0.04 K20 F0.003 (OD GROOVE)

Example is in inch. Check offsets and clearances first.

Watch out for

Step C must be smaller than the insert width.
On Fagor mills G88 is a circular pocket.

Related codes

G87 · G80 · G89

G88 on other controls

The same number can mean something different on another control.

Control	Meaning
Fanuc	Boring cycle, manual retract
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
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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