Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 409)

Axis Motion
Chapter 12
12-37
The format for the G96 block is:
G96 L__S__;
Where : Is :
L specifies whether CSS is in per minute or per second mode. L1 specifies per
second mode. L0 specifies per minute mode. If L is not programmed the control
uses the default mode defined in AMP by your system installer.
S specifies the constant surface speed in meters or feet per second (L1) or per
minute (L0).
Use the following equation to determine grinding wheel speed in RPM
when CSS is active. This equation is for reference only. The value
obtained here is calculated automatically by the control and you do not
need to program it.
(S
program
)(K)
N
w
= (--------------)
D
w
Where : Is :
N
w
Speed of grinding wheel (rpm) 1
K Constant 318.31 (1000/
π
) for metric system or 3.8197 (12/
π
) for inch system
S
program
Surface speed programmed in the G96 block (m/min or feet/min) 1
D
w
Dressed or worn diameter of grinding wheel (mm or inch)
1 if using units of seconds, make sure all S and N values are entered in seconds
If your cylindrical grinding machine uses the S--word to control part
spindle speed, then CSS (programmed with a G96) is available when
grinding the part. RPM spindle speed mode (programmed with a G97) is
also available for the part spindle.
Machines that fall into this category typically have manual or PAL
controlled wheel spindles. Wheel spindle speeds are changed through a
manual gear change, a speed selection switch or special M codes. Much of
this depends on your control’s AMP configuration and PAL program.
Refer to the documentation prepared by your system installer for details.
Important: Constant Surface Speed (CSS) is applied only to the spindle
that is controlled with the programmed S--word.
12.5.3
Cylindrical Grinder,
S- word for Part Speed