Owner's manual

Using Pocket Milling Cycles
Chapter 22
22-19
Use the G88.2 pocket milling finishing cycle to finish a circular pocket in a
workpiece. This cycle is typically used to remove the finish allowance that
was left on the sides of a circular pocket during a G88.1 cycle.
The G88.2 block used to finish a circular pocket has this format:
G88.2 X__Y__Z__R__P__H__L__F__;
Where : Is :
XY
The coordinates thatspecify the centerofthecircularpocket.
Z
The coordinate (along the plungingaxis)thatspecifies the bottomofthe circular
pocket.
R
The radius of thecircular pocket. This parameter mustbeprogrammed.
P
Direction offinishing cut.
H
Finishallowance.
L
Incrementalplunge depth.
F
Finishingfeedrate.
In a finishing cycle, a smooth entry to and exit from the finish contour is
accomplished by having the tool approach and leave the finish contour
along a tangential arc. The radius of this arc i s set equal to the tool radius
by the c ontrol. The tangential e ntry/exit point will always be at the left
side of the c ircular pocket along the -X axis.
Figure 22.7
Circular Pocket Finishing Using G88.2
TANGENTIAL
ENTRY/EXIT
PATH
(X, Y)
FINISH CUT
TOOL
RADIUS
Y
X
22.2.2
CircularPocket Finishing
Using G88.2