Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 695)

Skip, Gauge, and Probing Cycles
Chapter 27
27-21
The system installer determines how many counts of the adaptive depth
probe constitutes contact with the part (a probe fired event AMPed as the
probe trigger tolerance). Multiple counts are typically required because of
the potential for probe deflection from acceleration/deceleration or
machine vibration. This number of counts for the probe to fire is added
back into the current axis position for an accurate part surface location.
The position of the adaptive depth probe when it senses part contact is
handled by the control as follows:
Probe Position when G26 Programmed: Results in:
No probe deflection when adaptive depth
axis starts moving. Normal operation, control drills to programmed integrand depth.
Probe is already depressed some distance
when adaptive depth axis starts moving. • If current probe deflection is less than programmed integrand depth the
control assumes it is executing either consecutive G26 blocks on that axis
or it is continuing a previously aborted adaptive depth move. The tool
continues on to integrand depth.
• If current probe deflection is past the programmed integrand depth the tool
retracts to the new integrand position relative to the part surface.
No probe deflection and the programmed
integrand depth is smaller then the AMPed
probe trigger tolerance. The control will generate an error since the tool would exceed the integrand
letter depth before the probe fires. You must either increase the drilling depth
(the integrand amount in block) or your system installer must, using AMP,
decrease the probe trigger tolerance.
The depth probe must fire before the programmed endpoint (G26 block
axis word) is reached. If the axis reaches the programmed endpoint before
the probe has fired, the control displays an error message and block
execution stops. You must reset the program block to continue.
Once the probe is depressed from a G26 block:
additional G26 blocks that use the probe can be executed. Once the
adaptive depth probe is fired and remains depressed, any G26 block can
position the adaptive depth axis using the adaptive depth probe for
position feedback. These G26 blocks must be consecutive except for:
- non motion blocks
- blocks that do not position the adaptive depth axis
- non G26 blocks that completely move the adaptive depth probe
off of the part (probe position less than zero at endpoint).