Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 696)

Skip, Gauge, and Probing Cycles
Chapter 27
27-22
Once the probe is fired you must position the adaptive depth axis
(assuming the probe is closing the feedback loop) using the integrand
word in a G26 block. You must also still program an adaptive depth
axis word (see Example 27.2). If you use a non-G26 block to position
the adaptive depth axis, feedback is immediately switched from the
adaptive depth probe back to the adaptive depth axis’normal feedback
device. The endpoint of this non-G26 block must completely remove
any probe deflection that occurs beyond the probes zero point or a
warning is generated.
as long as the probe remains depressed, other G26 blocks reference the
zero point established the last time the probe tripped.
the axis decelerates to a zero feedrate between consecutive G26 blocks
(even if they are in the same direction). This is a result of the control
performing a re-setup of part program blocks before executing any G26
block.
To program consecutive G26 blocks you must still program the G26
command along with the adaptive depth axis and its integrand. The
adaptive depth axis block endpoint should be programmed in the same
direction and well beyond the actual probe deflection at end point for any
G26 block. The axis integrand (being the depth of cut) programs the new
tool position. For example:
Example 27.2
Adaptive Depth Drilling with Consecutive G26 Blocks
(Peck Drilling Example)
Spindle
Motor
Adaptive Depth Probe
Drilling Surface
Z Axis
Z
20
15
10
5
0
Z Point behind the
depth of hole for
all pullbacks
G90G01F100 ;
G26 Z0 K4 (INFEED);
G26 Z15 K2(PULLBACK);
G04 P5;
G26 Z0 K6 (INFEED);
G26 Z15 K3 (PULLBACK);
G26 Z0 K8 (INFEED);
G01 Z15 (EXIT PART);
M02;
Z Point past
drilling final depth
for all consecutive
G26 blocks.
Probe fires
Non-motion blocks or other axis
motions can be exeucuted
between consecutive G26 blocks
Non-G26 blocks that are executed on
the adaptive depth axis must have an
endpoint with no probe deflection.