HEIDENHAIN TNC 620 User Manual page 81

Fixed Cycles: Drilling | UNIVERSAL DRILLING (Cycle 203, DIN/ISO: G203, software option 19)
Behavior with chip breaking and without decrement:
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 at the programmed feed rate for plunging Q206
to the first plunging depth Q202
3 The TNC then disengages the tool by the value of Retraction
rate for chip breaking Q256
4 An infeed is then again machined by the value of plunging
depth Q202 at feed rate for plunging Q206
5 The TNC repeatedly infeeds until achieving the number of chip
breaks Q213 or until the hole has the desired depth Q201.
If the defined number of chip breaks is achieved but the hole
does not yet have the desired depth Q201, the TNC retracts the
tool from the hole at feed rate for retraction Q208 to set-up
clearance Q200
6 If programmed, the TNC now waits in accordance with the
dwell time at top Q210
7 Then the TNC plunges at rapid traverse into the hole to the
value retraction rate for chip breaking Q256 above the last
infeed depth
8 Procedure 2-7 is repeated until depth Q201 is achieved.
9 When Depth Q201 is achieved, the TNC removes the tool with
Fmax from the hole to the 2nd set-up clearance Q204
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
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