Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 569

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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-planeaxis
2
reciprocationprimaryreversalpoint from last cycle programmed abs. or inc.
Reciprocation axis integrand
3
reciprocationsecondaryreversal point from last cycle programmed abs.or inc.
Planeaxis1
2
crossoveramount fromlast cycle programmed abs.orinc.
Planeaxis1 integrand
2
crosspickatprimaryreversalpoint from last cycle programmed inc. only
Q
3
crosspickatsecondaryreversal point cross pick at primary reversal inc.only
Planeaxis2
2
plunge depth fromlast cycle programmed abs.orinc.
Planeaxis2 integrand
2
plunge pickat start fromlast cycle programmed inc.only
R
3
plunge pickat crossover plunge pickat start inc.only
L
3
numberof spark-outpasses zero zeroto 999
F
2
plunge pickand crosspickfeedrate lastfeedrateprogrammed valid F word
E
3
reciprocationfeedrate from last cycle or last F valid F word
P
3 forG84 2 forG84.1
dressprogramnumber from last cycle programmed valid programnumber
D
3
numberof auto-dressexecutions zero zeroto 999
1
mustbe programmed
2
musthave been programmed i n some previousblock 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 i n 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)
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