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G96 Constant surface speed on
Haas NGC G-code · Lathe
Makes S a surface speed in SFM, inch, or meters per minute, metric. RPM goes up as the tool moves toward center. Gives a steady finish on faces and tapers.
Format
G96 S
Addresses
| Address | What it does |
|---|---|
S | Surface speed, SFM in inch |
How it works
Modal, group 13. Cancel with G97.
Example program
T0101 (OD FINISH TOOL)
G50 S3000 (MAX 3000 RPM)
G96 S600 M03 (CSS 600 SFM)
G00 G54 X2.1 Z0 (FACE START)
…
G50 S3000 (MAX 3000 RPM)
G96 S600 M03 (CSS 600 SFM)
G00 G54 X2.1 Z0 (FACE START)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Always set G50 first. Without a limit the spindle can run away at X0 and throw the part.
- RPM equals 3.82 times SFM divided by diameter.
- Do not use G96 for threading, tapping or drilling on center.
Related codes
G96 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Constant surface speed |
| Mazak (EIA) | Constant surface speed |
| Okuma OSP | Constant surface speed on |
| Mitsubishi M70 M80 | Constant surface speed on |
| Siemens 840D 828D | Constant cutting speed |
| Fagor 8055 8065 | Constant feed at cutting point (mill) |
| LinuxCNC Tormach | Constant surface speed |
| Mach3 Mach4 | Constant surface speed, Mach4 |
| Centroid CNC12 Acorn | Constant surface speed |
| Swiss (Citizen Star) | Constant surface speed |
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 G96 in the app All Haas NGC G-codes