G77 Tapping compound cycle

Okuma OSP G-code · Lathe

Taps a right hand thread on center. Feeds in, stops and reverses the spindle at depth, and feeds out.

Format

G77 X Z K F

Addresses

Address	What it does
`X`	X of the start point, normally 0
`Z`	Tap depth
`K`	Point in Z where the rapid approach ends
`F`	Tapping feed, the pitch in per rev mode

How it works

Compound fixed cycle. One shot.

Example program

O2000 (OKUMA LATHE SAMPLE)
N1 G50 S3000 (MAX SPINDLE 3000 RPM)
N2 G00 X0 Z1. T111111 (.500-13 TAP)
N3 G97 S300 M03 (300 RPM)
…

The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.

Watch out for

Start the spindle before G77. Without spindle speed the cycle halts.
Use a floating tap holder unless synchronized tapping G178 is used.

Related codes

G78

G77 on other controls

The same number can mean something different on another control.

Control	Meaning
Haas NGC	Back bore cycle
Brother Speedio	Tapping cycle with pitch input

Every G-code for Okuma OSP 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 G77 in the app All Okuma OSP G-codes

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