HEIDENHAIN TNC 360 ISO Programming - Manual (Page 179)

8-26
8 Cycles
TNC 360
Fig. 8.30: Infeeds and distances for
CONTOUR MILLING
8.3 SL Cycles
A
B
C
Fig. 8.31: Finishing allowance
Y
X
D
CONTOUR MILLING G58/G59
Cycles G58/G59 are used to finish-mill the contour pocket.
This cycle can also be used generally for milling contours.
Process
• The tool is positioned above the first starting point.
• The tool then penetrates at the programmed feed rate to the first
pecking depth.
• On reaching the first pecking depth, the tool mills the first contour at
the programmed feed rate and in the specified direction of rotation.
• At the infeed point, the tool is advanced to the next pecking depth.
This process is repeated until the programmed milling depth is reached.
The remaining subcontours are milled in the same manner.
Required tool
This cycle requires a center-cut end mill (ISO 1641).
Direction of rotation for CONTOUR MILLING
With clockwise direction of rotation G58:
• M3 defines climb milling for pocket and island.
With counterclockwise direction of rotation G59:
• M3 defines up-cut milling for pocket and island.
Input data
• SETUP CLEARANCE A
• MILLING DEPTH B
• PECKING DEPTH C
• FEED RATE FOR PECKING:
Traversing speed of the tool during penetration.
• FEED RATE:
Traversing speed of the tool in the working plane.