HEIDENHAIN TNC 360 User Manual - Manual (Page 165)

TNC 360 8-12
8 Cycles
Fig. 8.7: Infeeds and distances for the
POCKET MILLING cycle
Fig. 8.8: Side lengths of the pocket
Fig. 8.9: Tool path for roughing out
8.2 Simple Fixed Cycles
POCKET MILLING (Cycle 4)
Process
The rectangular pocket milling cycle is a roughing cycle, in which
• the tool penetrates the workpiece at the starting position (pocket
center)
• the tool subsequently follows the programmed path at the specified
feed rate (see Fig. 8.9) .
The cutter begins milling in the positive axis direction of the longer side.
With square pockets, the cutter begins in the positive Y-direction. At the
end of the cycle, the tool returns to the starting position.
Requirements / Limitations
This cycle requires a center-cut end mill (ISO 1641) or a separate pilot
drilling operation at the pocket center. The pocket sides are parallel to the
axes of the coordinate system.
Input data
• Setup clearance A
• Milling depth B
• Pecking depth
C
• FEED RATE FOR PECKING:
Traversing speed of the tool during penetration.
• FIRST SIDE LENGTH D :
Length of the pocket, parallel to the first main axis of the working
plane.
• SECOND SIDE LENGTH E :
Width of the pocket
The signs of the side lengths are always positive
• FEED RATE:
Traversing speed of the tool in the working plane.
• DIRECTION OF THE MILLING PATH:
DR + : Climb milling with M3
DR – : Up-cut milling with M3
The radius of the pocket corners is determined by the cutter radius. The tool does not perform any circular move-
ment in the pocket corners.
Calculations:
Stepover factor k:
k = K x R
K: Overlap factor (preset by the machine builder)
R: Cutter radius
A
B
C
E
D
DR+
DR–
F
k