Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 580)

Using Pocket Milling Cycles
Chapter 22
22-8
Use the G88.1 pocket milling roughing cycle to rough out a slot in a
workpiece. This cycle makes multiple cuts at a programmed length and
depth.
The G88.1 block used to rough out a slot has this format:
G88.1 X__Y__Z__I__R__P__H__D__L__E__F__; (X axis slot)
or
G88.1 X__Y__Z__J__R__P__H__D__L__E__F__; (Y axis slot)
Where : Is :
X Y The coordinates that specify the center of the slot.
Z The coordinate (along the plunging axis) that specifies the bottom of the slot.
I J The length of the slot as measured from the points where the axis intersects the
arc at each end of the slot. I specifies the length of a X axis slot. J specifies the
length of a Y axis slot. These are unsigned incremental values.
Important: It is assumed that I and J are assigned in AMP as the integrand
axis names that correspond to the X and Y axes respectively.
R The radius of the arc at each end of the slot. The radius equals the slot-width/2.
If not programmed, the control uses the tool radius value.
Important: When roughing out a slot, the tool radius can not exceed the
radius of the arc at each end of the slot. If it does, the control enters Cycle-Stop
mode and displays the error message “TOOL RADIUS TOO LARGE”on the
CRT.
P Direction of roughing cut.
H Finish allowance.
D Roughing cut thickness.
L Incremental plunge depth.
E Plunge feedrate.
F Roughing feedrate.
22.1.3
Slot Roughing Using G88.1