Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 603)

Cylindrical Grinding Fixed Cycles
Chapter 17
17-29
If a number of spark-out revolutions (L) is programmed in the block, the
axes dwell at the plunge and shoulder depth for the designated number of
revolutions of the spindle. Then they simultaneously retract to the start
position at the rapid feedrate. The G87.1 cycle is identical but begins with
a pre-dress operation prior to the grind.
The following describes each of the cycle’s parameters.
Z -- plunge end point. If in incremental mode (G91 active) then the value
entered here is a signed incremental value indicating the Z distance from
the start point to the end point of the plunge motion. The start point is the
coordinate of the Z axis prior to execution of the grinding cycle.
If in absolute mode (G90 active) then the value entered here is the Z
coordinate of the plunge end point.
This parameter is not “program modal,” meaning that it must be
programmed in the G87 block. If not programmed, the error “FEED AXIS
DATA NOT PROGRAMMED” results.
X -- shoulder end point. If in incremental mode (G91 active) then the
value entered here is a signed incremental value indicating the X distance
from the start point to the end point of the shoulder grinding motion. The
start point is the coordinate of the X axis prior to execution of the grinding
cycle.
If in absolute mode (G90 active) then the value entered here is the X
coordinate of the shoulder grind end point.
This parameter is not “program modal,” meaning that it must be
programmed in the G87 block. If not programmed, the error “FEED AXIS
DATA NOT PROGRAMMED” results.
L, F, E and P -- These parameters were described on page 17-9.