Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 406)

Axis Motion
Chapter 12
12-34
This section covers the following topics:
Topic: On page:
Surface Grinder, No S--word 12-35
Surface Grinder, S--word for Wheel Speed 12-36
Cylindrical Grinder, S--word for Part Speed 12-37
Cylindrical Grinder, S--word for Wheel Speed 12-40
Notes on Constant Surface Speed Mode (G96) 12-42
CSS Axis Selection 12-45
CSS Examples 12-46
RPM Spindle Speed Mode (G97) 12-51
Grinding speeds are established by setting spindle speeds. In the case of
cylindrical grinders, there are two separate spindles, the grinding wheel
spindle and the part spindle. The control uses the S--word to control the
speed of one of the spindles. If a machine requires more than one spindle,
the second must be controlled manually or through the PAL program.
Refer to the documentation prepared by your system installer for details.
The S--word controlled spindle operates in one of the following modes:
Constant Surface Speed Mode (G96) - maintains the speed of the
grinding wheel surface relative to the part surface at a constant rate.
This relative speed is measured as a surface speed with units of m/min,
m/sec, in/min, or in/sec.
To maintain a constant surface speed when grinding a cylindrical part at
different diameters, the grinding wheel or part spindle speed should be
decreased as diameters are increased. This maintains a constant speed
of the part surface relative to the grinding wheel surface. The same is
true when dressing a wheel. In that case constant surface speed applies
to the wheel speed relative to the dressing tool.
RPM Spindle Speed Mode (G97) - maintains a constant spindle speed
equal to the programmed S--word. This speed is independent of the
working diameter of the part or the grinding wheel. G97 is described in
detail on page 12-51 of this chapter.
12.5
Spindle Speed Control