Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 601)

Cylindrical Grinding Fixed Cycles
Chapter 17
17-27
Figure 17.7
G86 Shoulder Grinding Motions
Part
START
Retract
Z, X Vector feed
12057-I
Programming a G86 causes the control to execute a single vector move to
the programmed axis 1 (Z) and axis 2 (X) plunge end points at the plunge
feedrate F. If a number of spark-out revolutions (L) is programmed in the
block, the axes dwell at the plunge depth for the designated number of
revolutions of the spindle. Then they retract to the start position at the
rapid feedrate. The G86.1 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 G86 block. If not programmed, the error “FEED AXIS
DATA NOT PROGRAMMED” results.
X -- plunge 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 plunge 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 plunge end point.
This parameter is not “program modal,” meaning that it must be
programmed in the G86 block. If not programmed, the error “FEED AXIS
DATA NOT PROGRAMMED” results.
L, F and P -- These parameters were described on page 17-9.