Owner's manual

Using Pocket Milling Cycles
Chapter 22
22-2
Use the G88.1 pocket milling roughing cycle to rough out a rectangular
pocket in a workpiece. This cycle makes multiple rectangular cuts at a
programmed width and depth.
The G88.1 block used to rough out a rectangular pocket has this format:
G88.1 X__Y__Z__I__J__(,R or,C)__P__H__D__L__E__F__;
Where : Is :
XY
The coordinates thatspecify the centeroftherectangularpocket.
Z
The coordinate (along the plungingaxis)thatspecifies the bottomofthe
rectangularpocket. In incremental mode thisparameterspecifiesthedepthof
the pocketasmeasured fromthe startlevelto the pocketbottom. This
parametermustbe programmed.
IJ
The length oftherectangularpocket’s sides. I specifies the length ofthe side
parallel to the Xaxis. Jspecifies the length ofthe side parallel to the Yaxis.
These are unsigned incremental values.
Important: Itisassumedthat Iand Jareassigned in AMP as the integrand
axisnamesthatcorrespond tothe Xand Yaxesrespectively.
Important: When roughing outarectangularpocket,thetooldiametercan
notexceedthelength ofthe shortestsideofthe rectangularpocket. Ifitdoes,
the controlenters Cycle-Stop mode anddisplaystheerror message“TOOL
RADIUSTOOL ARG E”on theCRT.
,R
Corner radius. This isan optionalparameterthatis used to programrounded
interiorcornersin the rectangularpocket.
,C
Corner chamfer. This is anoptionalparameterthatis used to program
chamferedinteriorcornersin the rectangularpocket.
Important: In ordertoprogramrounded or chamfered cornersthe
Chamfering and CornerRadiusoption mustbe installedin the control.
P
Directionofroughing cut. Thisparameterdetermines whethertheroughingcuts
areperformed ina clockwiseor counter-clockwise motion. P0specifies
clockwise. P1 specifiescounter-clockwise.
Important: Cuttercompensation (G41/G42)mustbe disabled prior to the
G88.1 block. The controlgenerates an errorifcompensationis not disabled.
H
The finishallowancethatwill be lefton the sidesofthe pocket. Thisfinish
allowance can be removed laterusing a G88.2 finishing cycle.
To leavea finishallowance on the pocketbottom,programapocketdepth(Z
parameter)thatisatthe desired finishallowanceabove the actual pocketbottom.
This finishallo wance can be removed laterusin g a G88.2 finishing cycle.
D
Roughingcutthickness. This parameter specifies the maximumwidth ofanyXY
axisroughingcuts. Thisisan optional parameter. Ifnotprogrammed,thecontrol
usesthedefaultthickness,whichis equalto halfofthe currenttool diameter.
Important: T he roughing cutthicknesscan notbegreaterthanthecurrent
tool diameter. Ifitis,thecontrol will enterCycle-Stop modeand display the error
message “D-WORD LARGER THAN TOOL DIAMETER”on the CRT.
L
Incrementalplunge depth ofeachcuttingpass along the Z axis. IfL isnot
programmed,theplunge amountwillbe equalto the programmed depth ofthe
pocket. Thisisan optional parameter.
22.1.1
Rectangular Pocket
Roughing Using G88.1