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G77 Tapping cycle with pitch input
Brother Speedio G-code · Mill
Brother tapping cycle where the thread pitch is given and the control works out the feed. Right hand thread.
Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.
Format
G77 X Y Z R J [I] [L]
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Thread depth |
R | R plane |
J | Pitch in inches for inch programs |
I | Pitch in millimeters for metric programs |
L | Spindle speed for the return stroke |
How it works
Modal, canned cycle. Cancel with G80.
Example program
G100 T05 G90 G54 G00 X1. Y1. G43 H05 Z1. S1000 M03 (.500-13 TAP)
G98 G77 Z-.75 R.1 J.07692 (13 TPI PITCH)
X2. (NEXT HOLE)
G80 G00 Z1. (CANCEL)
G98 G77 Z-.75 R.1 J.07692 (13 TPI PITCH)
X2. (NEXT HOLE)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Not the same as G77 back boring on other controls.
- Check the pitch address in your manual before running.
Related codes
G77 on other controls
The same number can mean something different on another control.
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