HEIDENHAIN TNC 360 User Manual - Manual (Page 167)

TNC 360 8-14
8 Cycles
Fig. 8.12: Direction of the cutter path
Fig. 8.11: Distances and infeeds with
CIRCULAR POCKET MILLING
Fig. 8.10: Cutter path for roughing-out
8.2 Simple Fixed Cycles
DR+ DR–
F
R
A
B
C
CIRCULAR POCKET MILLING (Cycle 5)
Process
• Circular pocket milling is a roughing cycle. The tool penetrates the
workpiece from the starting position (pocket center).
• The cutter then follows a spiral path at the programmed feed rate (see
illustration at right). The stepover factor is determined by the value of k
(see Cycle 4, RECTANGULAR POCKET MILLING: calculations).
• The process is repeated until the programmed milling depth is reached.
• At the end of the cycle the tool returns to the starting position.
Required tool
This cycle requires a center-cut end mill (ISO 1641) or a separate pilot
drilling operation at the pocket center.
Input data
• SETUP CLEARANCE A
• MILLING DEPTH B : depth of the pocket
• PECKING DEPTH
C
• FEED RATE FOR PECKING:
Traversing speed of the tool during penetration
• CIRCLE RADIUS R :
Radius of the circular pocket
• 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