Owner's manual

Using Hemisphere Milling Cycles
Chapter 24
24-5
Use the G88.5 convex milling roughing cycle to rough out a convex pocket
in a workpiece. This cycle makes multiple concentric circular cuts at a
programmed width and depth from the top center of the convex
hemisphere to the outermost diameter of the convex hemisphere.
The G88.5 block used to rough out a convex pocket has this format:
G88.5 X__Y__Z__R__Q1_P__H__D__L__E__F__;
Where : Is :
XY
The coordinates thatspecify the centeroftheconvexhemisphere intheselected
plane.
Z
The coordinate (along the plungingaxis)thatspecifies the baseofthe convex
hemisphere.
R
Radiusofthe convexhemisphere.
Q1
Codespecifying aconvexhemisphere.
P
Directionofroughing cut.
H
Finishallowance.
D
Roughingcutthickness.
L
Roughingcusp height.
E
Plungefeedrate.
F
Roughingfeedrate.
If Q1 is programmed, the control generates a convex hemisphere. The
control m akes multiple concentric circular cuts at each level of the convex
hemisphere. The depth of the pocket and the diameter of each level
increases until the outer diameter of the convex hemisphere is reached.
Important: The tool should be positioned near the center of the convex
hemisphere prior t o the G88.5 block. The Z coordinate of this position
determines the initial Z level or top of the pocket. This is the pre-cycle
position of the tool.
24.1.2
Convex Hemisphere
Roughing Using G88.5