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G74 Left hand tapping cycle
Brother Speedio G-code · Mill
Taps a left hand thread. Spindle runs reverse in and forward out.
Format
G74 X Y Z R F
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Thread depth |
R | R plane |
F | Feed equals RPM times pitch |
How it works
Modal, canned cycle. Cancel with G80.
Example program
G100 T05 G90 G54 G00 X1. Y1. G43 H05 Z1. S500 M04 (.250-20 LH TAP)
G99 G74 Z-.5 R.1 F25. (500 RPM TIMES .05 PITCH)
G80 G00 Z1. (CANCEL)
G99 G74 Z-.5 R.1 F25. (500 RPM TIMES .05 PITCH)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Start the spindle with M04 before the cycle.
- Feed must match pitch exactly or the tap breaks.
Related codes
G74 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Left hand tapping cycle |
| Haas NGC | Reverse tapping cycle |
| Mazak (EIA) | Reverse tapping cycle |
| Okuma OSP | Reverse tapping cycle |
| Mitsubishi M70 M80 | Reverse tapping cycle |
| Siemens 840D 828D | Reference point approach |
| Fagor 8055 8065 | Home search |
| LinuxCNC Tormach | Left hand tapping cycle |
| Mach3 Mach4 | Left hand tapping, Mach4 |
| Centroid CNC12 Acorn | Left hand tapping cycle |
| Hurco WinMax (NC) | Left hand tap (ISNC) or single quadrant arc (BNC) |
| Fadal | Left hand tap |
| Swiss (Citizen Star) | Face peck drilling and grooving cycle |
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