Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 410)

Axis Motion
Chapter 12
12-38
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).
When using CSS during part grinding, the axis perpendicular to the part
axis typically is selected as the CSS axis. CSS axis selection is described
on page 12-45.
Grinding wheel surface speeds relative to the surface of a rotating part
should be based on the specifications of the wheel and the material being
ground. Enter this surface speed in the G96 block using the S parameter as
described below:
If you want to program the part surface speed relative to a stationary
wheel, enter that value directly with the S parameter in the G96 block.
If you want to program actual surface speed (part surface speed relative
to a rotating wheel), you must use the following equation to determine
the correct value to enter with the S parameter in the G96 block. This is
necessary to take into account the wheel rotation speed. This equation
assumes that the wheel and part are rotating into each other (both
spinning in the same direction).
(D
w
)(N
w
)
S
program
= S
desired
- (----------)
K
Where : Is :
S
program
Surface speed to program in the G96 block (m/min or feet/min) 1
S
desired
Desired actual surface speed (m/min or feet/min) 1
D
w
Diameter of grinding wheel (mm or inch)
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
1 if using units of seconds, make sure all S and N values are entered in seconds