Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 422)

Axis Motion
Chapter 12
12-50
Figure 12.25
Results of Example 12.21, CSS while Grinding a Rotating Part
200
100
3
2
1
Grinding
wheel
Grinding
wheel
Grinding
wheel
Part
Start
X220, Z70
--Z
--X
12037-I
Grinding Wheel Position Part Diameter (mm) Part Spindle Speed (rpm)
1 200 1,273
2 100 2,546
3 0 3,500 1
1 The calculated spindle speed would be infinite because the diameter of the workpiece at wheel
position 3 is zero (0). When the maximum part spindle speed of 3,500 rpm (set in AMP) is
reached, it is not exceeded.
Important: To prevent the spindle speed from reaching the maximum
RPM, you can set a limit on the spindle speed using a G92 block with an
S--word as described on page 12-42.
The surface speed used in this example (800 m/min) is the surface speed
relative to a stationary grinding wheel. If an actual surface speed of 800
m/min were desired, the grinding wheel speed and diameter would have to
be entered into the equation on page 12-38 and an S
program
value
determined.
For example, if the grinding wheel speed was 1,200 rpm and its diameter
was 180 mm, to maintain an actual surface speed of 800 m/min, you would
program a surface speed of 121 m/min with the S--word in the G96 block.