The format for the g84 cycle is as follows – Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set User Manual
Page 569
Surface Grinding Fixed Cycles
Chapter 16
16-19
The format for the G84 cycle is as follows:
G84X__I__Y__J__Z__K__R__Q__L__F__E__P__D__;
Table 16.D summarizes the G84 cycle parameters. For a detailed
description of these parameters, see the text below and page 16-8.
Table 16.D
G84 Cycle Parameters
Parameter:
Definition:
Default Value:
Possible Value:
Non-plane axis
2
reciprocation primary reversal point
from last cycle programmed
abs. or inc.
Reciprocation axis integrand
3
reciprocation secondary reversal point
from last cycle programmed
abs. or inc.
Plane axis 1
2
crossover amount
from last cycle programmed
abs. or inc.
Plane axis 1 integrand
2
cross pick at primary reversal point
from last cycle programmed
inc. only
Q
3
cross pick at secondary reversal point
cross pick at primary reversal
inc. only
Plane axis 2
2
plunge depth
from last cycle programmed
abs. or inc.
Plane axis 2 integrand
2
plunge pick at start
from last cycle programmed
inc. only
R
3
plunge pick at crossover
plunge pick at start
inc. only
L
3
number of spark-out passes
zero
zero to 999
F
2
plunge pick and cross pick feedrate
last feedrate programmed
valid F word
E
3
reciprocation feedrate
from last cycle or last F
valid F word
P
3 for G84 2 for G84.1
dress program number
from last cycle programmed
valid program number
D
3
number of auto-dress executions
zero
zero to 999
1
must be programmed
2
must have been programmed in some previous block if omitted
3
optional
Figure 16.5 in the previous section shows the axis motions that make up
the G83 incremental plane grinding cycle when the G19 (YZ) plane is
active. For the G84 cycle, these motions would be identical except that the
Z axis (plane axis 2 for G19) would be the plunge axis.
Programming a G84 or G84.1 causes the control to execute an incremental
plane grinding cycle using three axes. “Incremental” refers to the fact that
the cross pick move is executed in a single increment at the end of each
reciprocation move. A plunge move towards the part is made after each
crossover is completed. The G84.1 begins with a pre-dress operation prior
to the grind.
The G84 cycle dictates that the axis configured as axis two in the active
plane makes the plunge moves. The axis configured as axis one in the
active plane makes the cross pick moves, while the axis not in the active
plane is the reciprocating axis.
16.6
G84 or G84.1 Incremental
Plane Grinding (Axis 2)