HEIDENHAIN TNC 426 (280 476) - Manual (Page 239)

212 8 Programming: Cycles
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
DRILLING (Cycle 200)
1 The TNC positions the tool in the tool axis at rapid traverse FMAX
to the set-up clearance above the workpiece surface.
2 The tool drills to the first plunging depth at the programmed feed
rate F.
3 The TNC returns the tool at FMAX to the setup clearance, dwells
there (if a dwell time was entered), and then moves at FMAX to
the setup clearance above the first plunging depth.
4 The tool then advances with another infeed at the programmed
feed rate F.
5 The TNC repeats this process (2 to 4) until the programmed depth
is reached.
6 At the hole bottom, the tool path is retraced to setup clearance or
— if programmed — to the 2nd setup clearance in rapid traverse
FMAX.
X
Z
Q200
Q201
Q206
Q202
Q210
Q203
Q204
Before programming, note the following:
Program a positioning block for the starting point (hole
center) in the working plane with radius compensation R0.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program DEPTH
= 0, the cycle will not be executed.