CNC Machinist Calculator UltraHome › G-codes › Mitsubishi M70 M80 › G74
G74 Reverse tapping cycle / Face cut-off and peck drilling cycle
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: Reverse tapping cycle
Taps a left hand thread. Spindle runs in reverse going in and forward coming out.
Format
G74 X Y Z R P F [,R]
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
P | Dwell at bottom |
F | Feed, RPM times pitch in G94 |
,R | ,R1 synchronous, ,R0 floating |
How it works
Modal, canned cycle group 09. Cancel with G80.
Example program
G90 G54 G00 X1. Y1. S300 M04 (REVERSE SPINDLE)
G43 H06 Z1. M08 (LENGTH COMP)
G98 G74 Z-.75 R.1 F23.08 ,R1 (.500-13 LH TAP)
G80 G00 Z1. (CANCEL)
G43 H06 Z1. M08 (LENGTH COMP)
G98 G74 Z-.75 R.1 F23.08 ,R1 (.500-13 LH TAP)
G80 G00 Z1. (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Start the spindle with M04 for left hand taps.
On lathes: Face cut-off and peck drilling cycle
Pecks along Z. Used for face grooves and peck drilling on center.
Format
G74 R then G74 X Z P Q F
Addresses
| Address | What it does |
|---|---|
R | Retract after each peck |
X Z | End point |
P | X step |
Q | Z peck depth |
F | Feed |
How it works
Non-modal, group 00.
Example program
G97 S1000 M03 (DRILL SPEED)
G00 X0. Z.1 (CENTER)
G74 R.02 (RETRACT)
G74 Z-1. Q1000 F.005 (PECK DRILL)
G00 X0. Z.1 (CENTER)
G74 R.02 (RETRACT)
G74 Z-1. Q1000 F.005 (PECK DRILL)
Example is in inch. Check offsets and clearances first.
Watch out for
- P and Q are often given without decimal point in least units. .1 inch may be Q1000. Check your parameter.
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 |
| Brother Speedio | Left hand 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 |
Every G-code for Mitsubishi M70 M80 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 G74 in the app All Mitsubishi M70 M80 G-codes