Haas Lathe · G-code
G96 Constant Surface Speed On
S becomes surface feet (or metres) per minute. RPM rises and falls automatically as diameter changes.
What G96 does on a Haas lathe
In G96 the control adjusts RPM continuously so the cutting edge sees the same surface speed at any diameter. That gives consistent finish and tool life on facing and profiling.
Clamp maximum RPM with G50 before G96, and switch to G97 for drilling, tapping and threading on centre.
G96 format
| Address | Meaning |
|---|---|
S | Surface speed: SFM (inch) or m/min (metric) |
G96 example program
G50 S3000
G96 S650 M03
G00 X2.1 Z0.1⚠ Watch out
Drilling on centre in G96 sends RPM to the G50 clamp because the diameter is zero. Use G97 for drills and taps.
Related codes
G96 questions
What does G96 S600 mean?
Constant surface speed of 600 surface feet per minute (in inch mode).
Independent reference. Not affiliated with, sponsored by or endorsed by Haas Automation, Inc. Haas is a trademark of its respective owner. Always confirm codes against your machine's operator manual — options and settings vary by model and software version.