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G73 High speed peck drilling cycle / Pattern repeat cycle
Centroid CNC12 Acorn G-code · Mill, Lathe
On mills: High speed peck drilling cycle
Drills in pecks of Q with a short rapid retract after each peck for chip breaking. The retract amount comes from parameter 73, set with G10 P73.
Format
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
Q | Peck depth |
F | Feed rate |
K | Repeat count |
How it works
Modal, canned cycle. Cancel with G80, G0, G1, G2 or G3.
Example program
T1 M6 ; LOAD TOOL 1, Z GOES HOME FIRST
G54 G0 X0 Y0 ; WORK OFFSET 1
S2500 M3
…
The full 9-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- The retract is not on the cycle line. Set it with G10 P73 R.
- A cycle only runs on a line with X or Y.
On lathes: Pattern repeat cycle
Repeats the profile from block P to Q R times, each pass closer to size. Good for forgings and castings that already have the rough shape.
Format
Addresses
| Address | What it does |
|---|---|
U W line 1 | Total stock to remove in X and Z |
R | Number of passes |
P Q | First and last block numbers of the profile |
U W line 2 | Finish stock in X and Z |
F | Feed |
How it works
One shot.
Example program
G97 S1200 M3
G0 X2.2 Z1.6 M8 ; START POINT
G73 U.14 W.14 R3 ; 3 PASSES
…
The full 9-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- U is always a radius value.
- On a Centroid mill G73 is peck drilling. On the lathe it is this pattern repeat cycle.
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 |
| Mitsubishi M70 M80 | High speed peck 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 |
| Hurco WinMax (NC) | High speed peck drilling |
| Fadal | Peck drill, chip break |
| Swiss (Citizen Star) | Pattern repeat cycle |
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