Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set User Manual
Page 571

Surface Grinding Fixed Cycles
Chapter 16
16-21
Figure 16.6 shows the axis motions that make up the G85 continuous plane
grinding cycle. This figure assumes that the YZ plane (G19) is active.
Since the Y axis is plane axis 1 for G19, it is the plunge axis.
Figure 16.6
G85 Continuous Plane Grinding Motions
J
At this point, the crossover
move is executed in reverse
until the crossover axis is at
its start coordinate
Spark--out passes
Reciprocation
START
I
X
Q
Y
Crossover
Z
Magnetic table
12050-I
Programming a G85 or G85.1 causes the control to execute a continuous
plane grinding cycle using three axes. “Continuous” refers to the fact that
instead of making cross pick moves, the crossover axis moves
continuously towards its endpoint as the reciprocating axis moves back and
forth across the part. The G85.1 begins with a pre-dress operation prior to
the grind.
The G85 cycle dictates that the axis configured as axis one in the active
plane makes the plunge moves. The axis configured as axis two in the
active plane makes the crossover move, while any axis programmed that is
not in the active plane is the reciprocating axis. If reciprocation is already
active, it is not necessary to program a reciprocation axis in the G85 block.
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