HEIDENHAIN TNC 410 - Manual (Page 181)

8 Programming: Cycles 168
Pilot drilling (Cycle 15)
Process
Same as Cycle 1 Pecking (see ”8.3 Drilling Cycles”).
Application
Cycle 15 is for PILOT DRILLING of the cutter infeed points. It
accounts for the finishing allowance. The cutter infeed points also
serve as starting points for roughing.
Before programming, note the following:
Program a positioning block for the starting point in the
tool axis (set-up clearance above the workpiece surface).
ú Setup clearance (incremental value): Distance
between tool tip (at starting position) and workpiece
surface
ú Total hole depth (incremental value):
Distance between workpiece surface and bottom of
hole (tip of drill taper)
ú Plunging depth (incremental value):
Infeed per cut. The TNC will go to depth in one
movement if:
■ the plunging depth equals the total hole depth
■ the plunging depth is greater than the total hole depth
The total hole depth does not have to be a multiple of
the plunging depth.
ú Feed rate for plunging: Traversing speed in mm/min
for drilling
ú Finishing allowance: Allowance in the machining
plane
8.6 SL Cycles
X
Y
X
Z
Example NC blocks:
5 CYCL DEF 15.0 PILOT DRILLING
6 CYCL DEF 15.1 DIST+2 DEPTH-25
7 CYCL DEF 15.2 PLNGNG+3 F250 ALLOW+0.1