Universal Drilling - HEIDENHAIN TNC 320 User Manual

3.6 UNIVERSAL DRILLING

(Cycle 203, DIN/ISO: G203)
Cycle run
1 The TNC positions the tool in the tool axis at rapid traverse FMAX
to the programmed set-up clearance above the workpiece surface.
2 The tool drills to the first plunging depth at the programmed 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 the set-up
clearance at the retraction feed rate. If programmed, the tool
moves to the 2nd set-up clearance at FMAX.
HEIDENHAIN TNC 320 71