HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 182)

182 8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing,
T
apping 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 set-up clearance, dwells
there (if a dwell time was entered), and then moves at FMAX to
the set-up 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 The tool is retracted from the hole bottom to the set-up clearance
or—if programmed—to the 2nd set-up clearance at 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.
Use the machine parameter suppressDepthErr to define
whether, if a positive depth is entered, the TNC should
output an error message (on) or not (off).
Danger of collision!
Keep in mind that the TNC reverses the calculation for pre-
positioning when a positive depth is entered. This
means that the tool moves at rapid traverse in the tool axis
at safety clearance below the workpiece surface!