CNC Machinist Calculator UltraHome › G-codes › Haas NGC › G70
G70 Bolt hole circle / Finishing cycle
Haas NGC G-code · Mill, Lathe
On mills: Bolt hole circle
On a Haas mill G70 drills holes evenly spaced on a full circle using the active canned cycle. This is not the Fanuc lathe finish cycle.
Format
Addresses
| Address | What it does |
|---|---|
I | Radius of the bolt circle |
J | Angle of the first hole from the X axis, CCW is positive |
L | Number of holes evenly spaced around the circle |
How it works
Non-modal, group 00. A canned cycle must be active.
Example program
G90 G54 G00 X0. Y0. S2500 M03 (CENTER OF BOLT CIRCLE)
G43 H03 Z1. M08 (APPROACH)
G81 G98 Z-.5 R.1 F10. L0 (LOAD DRILL CYCLE, NO HOLE AT CENTER)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Position at the circle center and give the canned cycle L0 so no hole is drilled at the center.
- Cancel the canned cycle with G80 after the pattern.
On lathes: Finishing cycle
Finishes a contour already roughed with G71, G72 or G73. It runs the path from block P to block Q once, then rapids back to the start point.
Format
Addresses
| Address | What it does |
|---|---|
P | Block number where the finish path starts |
Q | Block number where the finish path ends |
How it works
Non-modal, group 00. G18 must be active.
Example program
G50 S3000 (LIMIT 3000 RPM)
G96 S500 M03 (CSS 500 SFM)
G00 G54 X2.1 Z.1 M08 (START POINT)
…
The full 9-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- F, S and T codes inside the P to Q blocks are used by G70, so put the finish feed there.
- The block after G70 runs next, not the block after Q.
- P values are modal, so a later G04 P or M97 P can be read wrong if a cycle is still active.
Related codes
G70 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Finishing cycle |
| Mazak (EIA) | Finishing cycle |
| Mitsubishi M70 M80 | Finishing cycle |
| Siemens 840D 828D | Inch input for geometry |
| Heidenhain TNC (ISO) | Inch units |
| Fagor 8055 8065 | Inch programming |
| LinuxCNC Tormach | Lathe finishing cycle |
| Mach3 Mach4 | Inch units, Mach3 |
| Centroid CNC12 Acorn | Profile finishing cycle |
| Hurco WinMax (NC) | Inch input (Basic NC) |
| Fadal | Check for inch setting, older code |
| Swiss (Citizen Star) | Finish turning cycle |
Every G-code for Haas NGC 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 G70 in the app All Haas NGC G-codes