HEIDENHAIN TNC 620 (34056x-04) Cycle programming - Manual (Page 74)

Fixed Cycles: Drilling
3.6 UNIVERSAL DRILLING (Cycle 203, DIN/ISO: G203, software option
19)
3
74
TNC 620 | User's Manual Cycle Programming | 5/2013
3.6 UNIVERSAL DRILLING (Cycle 203, DIN/
ISO: G203, software option 19)
Cycle run
1 The TNC positions the tool in the tool axis at rapid traverse
FMAX to the entered set-up clearance above the workpiece
surface.
2 The tool drills to the first plunging depth at the entered feed rate
F.
3 If you have programmed chip breaking, the tool then retracts
by the entered retraction value. If you are working without chip
breaking, the tool retracts at the retraction feed rate to the set-
up clearance, remains there—if programmed—for the entered
dwell time, and advances again 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. If programmed, the plunging depth is decreased after
each infeed by the decrement.
5 The TNC repeats this process (2 to 4) until the programmed
total hole depth is reached.
6 The tool remains at the hole bottom—if programmed—for
the entered dwell time to cut free, and then retracts to set-up
clearance at the retraction feed rate. If programmed, the tool
moves to the 2nd set-up clearance at
FMAX.
Please note while programming:
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.
Danger of collision!
Use the machine parameter displayDepthErr to
define whether, if a positive depth is entered, the
TNC should output an error message (on) or not (off).
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 to set-up clearance below
the workpiece surface!