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G73 High speed peck drilling / Pattern repeat rough cutting
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: High speed peck drilling
Pecks by Q and backs out a small amount between pecks to break chips.
Format
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
Q | Peck depth, always plus |
F | Feed rate |
How it works
Modal, canned cycle group 09. Cancel with G80.
Example program
G90 G54 G00 X1. Y1. S2400 M03 (START)
G43 H04 Z1. M08 (LENGTH COMP)
G99 G73 Z-.6 R.1 Q.1 F12. (PECK DRILL)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Back off amount is a parameter, not in the block.
- Chips stay in the hole. Use G83 for deep holes.
On lathes: Pattern repeat rough cutting
Repeats the shape offset inward each pass. Used for castings and forgings that follow the final shape.
Format
Addresses
| Address | What it does |
|---|---|
U W first block | Total stock to remove in X and Z |
R | Number of passes |
P Q | First and last shape sequence numbers |
U W second block | Finish stock |
F | Feed |
How it works
Non-modal, group 00.
Example program
G73 U.2 W.1 R3 (STOCK AND PASSES)
G73 P10 Q20 U.02 W.005 F.01 (PATTERN ROUGH)
N10 G00 X1. Z0. (SHAPE START)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- On bar stock it wastes air cuts. Use G71 instead.
Related codes
G73 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | High speed peck drilling |
| Haas NGC | High speed peck drilling cycle |
| Mazak (EIA) | High speed peck drilling |
| Okuma OSP | High speed deep hole drilling |
| Brother Speedio | High speed peck drilling |
| Heidenhain TNC (ISO) | Rotation of the coordinate system |
| Fagor 8055 8065 | Pattern rotation |
| LinuxCNC Tormach | Chip breaking drill cycle |
| Mach3 Mach4 | High speed peck drill |
| Centroid CNC12 Acorn | High speed peck drilling cycle |
| Hurco WinMax (NC) | High speed peck drilling |
| Fadal | Peck drill, chip break |
| Swiss (Citizen Star) | Pattern repeat cycle |
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