Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 573)

Chapter
22
22-1
Using Pocket Milling Cycles
Use pocket milling cycles to cut circular, rectangular, hemispherical
pockets and posts, or irregular pockets and posts. Pocket milling cycles are
cycles that make multiple passes along the X, Y, and Z axes to cut out a
pocket in a workpiece. There are 8 pocket milling cycles. These include:
five G88.1 Pocket Milling Roughing Cycles
three G88.2 Pocket Milling Finishing Cycles
Important: You must turn cutter compensation off before executing any of
these pocket cycles. An error “Illegal G Code During G41/G42” is
displayed if cutter compensation is on when the control executes one of
these pocket cycles.
Important: The Irregular Pocket Milling Cycles feature (G89.1 and
G89.2) is only available prior to system software release 12.xx. Any
attempt to program a G89.1 or G89.2 in release 12.xx or later will result in
the error message, “Illegal G--code”.
Use the G88.1 pocket milling roughing cycle to rough out rectangular or
circular pockets, slots, and to enlarge an existing rectangular or circular
pocket.
Important: The active plane is selected using G17, G18, or G19. In this
chapter it is assumed that G17, the XY plane, is selected as the active
plane. If the current plane is not the XY plane, the operation of these
cycles will rotate accordingly.
Important: Tool length and diameter offsets must be entered and active
prior to the G88 block.
These features are prohibited during execution of pocket milling cycles:
MDI mode
Tool offset changes through the offset softkey
The following subsections cover using the G88.1 roughing cycle for each
of the possible pockets.
22.0
Chapter Overview
22.1
Pocket Milling Roughing
Cycle (G88.1)