Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 323)

Chapter
11
11-1
Constant Surface Speed
As a cutting tool’s distance from the center of a rotating part changes, the
surface speed also changes. Use the constant surface speed feature (CSS)
to maintain a tool’s cutting speed on a rotating part regardless of the
diameter of the part. Refer to your programming and operation manual for
more information.
The CSS feature is activated in a program by a G96 code. A surface speed
is programmed with an S-word. The CSS feature maintains a constant
surface speed by varying the spindle RPM as the cutting tool’s distance
from the center of rotation changes.
CSS helps to produce a uniform machine finish for a rotating part.
Figure 11.1
Constant Surface Speed
CSS
axis
Cutting
tool
Speed (rpm) =
Surface speed
(2)(3.14159)(radius)
Center of rotation
Speed
(rpm)
radius
Surface
speed
11.0
Chapter Overview