HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 236)

8-29
8 Cycles
TNC 407/TNC 415 B/TNC 425
Fig. 8.30: Finishing allowance
Fig. 8.29: Example of cutter infeed points for
PECKING
PILOT DRILLING (Cycle 15)
Process
Pilot drilling of holes for cutter infeed at the starting points of the sub-
contours. With SL contours consisting of several overlapping pockets and
islands, the cutter infeed point is the starting point of the first subcontour:
• The tool is positioned at setup clearance over the first infeed point.
• The drilling sequence is identical with fixed cycle 1, PECKING.
• Subsequently, the tool is positioned above the second infeed point, and
the drilling process is repeated.
Input data
• SETUP CLEARANCE
• TOTAL HOLE DEPTH
• PECKING DEPTH
• FEED RATE F
• FINISHING ALLOWANCE D
Allowed material for the drilling operation (see Fig. 8.29)
The sum of tool radius and finishing allowance should remain the same
for pilot drilling and roughing out.
8.3 SL Cycles (Group I)
identical with cycle 1
PECKING
Y
X
Y
X
D
R