Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 585)

Using Pocket Milling Cycles
Chapter 22
22-13
Use the G88.1 pocket milling roughing cycle to enlarge an existing circular
pocket in a workpiece. This cycle makes multiple circular cuts at a
programmed width and depth.
The G88.1 block used to enlarge an existing circular pocket has this
format:
G88.1 X__Y__Z__R__Q__P__H__D__L__E__F__;
Where : Is :
X Y The coordinates that specify the center of the original circular pocket.
Z The coordinate (along the plunging axis) that specifies the bottom of the circular
pocket.
R The radius of the original circular pocket. This parameter must be programmed.
Q Unsigned incremental value that specifies how much the original circular pocket
should be enlarged. This parameter must be programmed. The radius of the
enlarged circular pocket is equal to R + Q.
P Direction of roughing cut.
H Finish allowance.
D Roughing cut thickness.
L Incremental plunge depth.
E Plunge feedrate.
F Roughing feedrate.
22.1.5
Circular Pocket Enlarging
Using G88.1