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M29 Set tap direction for G84
Centroid CNC12 Acorn M-code · Lathe
Sets the G84 tap direction. M29 alone is right hand. M29 P1 is left hand. Right hand is the default at job start.
Format
M29 [P1]
Addresses
| Address | What it does |
|---|---|
P1 | Left hand tapping |
How it works
Modal for G84.
Example program
T0606 ; LEFT HAND TAP
M29 P1 ; LEFT HAND MODE
G97 S300 M4 ; SPINDLE CCW
G0 X0 Z.25
…
M29 P1 ; LEFT HAND MODE
G97 S300 M4 ; SPINDLE CCW
G0 X0 Z.25
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Put M29 or M29 P1 before every G84, so a left hand setting from an old run never carries over.
Machine builders set many M codes, and they change by model and options. Check the M code list for your machine.
Related codes
M29 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Rigid tapping mode |
| Haas NGC | Set output relay with M-Fin |
| Doosan (Fanuc) | Rigid tapping mode select |
| DMG Mori MAPPS (Fanuc) | Synchronized tapping mode |
| Mazak (EIA) | Robot service call |
| Okuma OSP | Tool interference check function on |
| Mitsubishi M70 M80 | Synchronous tapping mode |
| Hurco WinMax (NC) | Rigid tap on (ISNC) |
Every M-code for Centroid CNC12 Acorn 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 M29 in the app All Centroid CNC12 Acorn M-codes