Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 613)

Cylindrical Grinding Fixed Cycles
Chapter 17
17-39
4. The X axis plunges to the final depth programmed for X at the
feedrate ,F. If the system installer has configured and activated a
micro-feed, it takes place in this phase. Any micro-feed amount
extends the plunge endpoint beyond the programmed X plunge depth.
Micro-feeds are performed at the ,F feedrate.
5. If a spark-out is programmed (L word) it is performed after the X axis
has completed its plunge (including any micro-feed amount).
6. The Z axis performs the blend. This is programmed with the K
parameter and is performed at the ,E feedrate.
7. Both axes retract at rapid feedrate to the start point.
Two-step grinders are angled-wheel grinders that are executing in the
two-step angled-wheel grinding mode (G16.4). These grinders have a
virtual X axis (no associated hardware) and a real Z and W axis. W is a
non-orthogonal axis (it is not perpendicular to Z).
Figure 17.12
G89 Multi-Step Plunge with Blend in Two Step Mode
Rapid Moves
Part
@F
@E
@,F
@,E
R
I
Q
K
Start Point
W
X
Z
The above figure assumes your system installer has selected the default
PAL state for two step grinding mode. The initial move from the start
point and the exit move back to the start point (all rapid moves in the
above figure) could be reversed. This cycle would then start with a plunge
to the R plane followed by a Z axis move and end with a Z axis move
followed by a rapid W move back to start point. Refer to chapter 14 for
details on the different operating modes of the G16.4 mode.
17.11.2
G89 for Two-Step Grinders