User's Manual ISO TNC 360 (260020xx, 280490xx) - heidenhain

8 Cycles
8.3 SL Cycles
TNC 360
Fig. 8.26: Milling the outlines
PILOT DRILLING G56
Process
Pilot drilling of holes for cutter infeed at the starting points of the subcontours.
With SL contours that consist of several overlapping surfaces, the
cutter infeed point is the starting point of the first subcontour:
• The tool is positioned above the first infeed point.
• The subsequent drilling sequence is identical to that of cycle G83:
PECKING.
• The tool is then positioned above the next infeed point, and the drilling
process is repeated.
Input data
• SETUP CLEARANCE
• MILLING DEPTH
• PECKING DEPTH
• DWELL TIME
• FEED RATE
Identical to cycle G83
PECKING
• FINISHING ALLOWANCE
Allowed material for the drilling operation (see Fig. 8.29).
The sum of tool radius and finishing allowance should be the same for
pilot drilling and roughing out.
Fig. 8.27: Milling completed
Y
Fig. 8.28: Example of cutter infeed for
PECKING
Y
R
D
Fig. 8.29: Finishing allowance
X
X
8-25