HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 81)

HEIDENHAIN TNC 620 81
3.9 BORE MILLING (Cy
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3.9 BORE MILLING (Cycle 208,
Advanced Programming
Features Software Option)
Cycle run
1 The TNC positions the tool in the spindle axis at rapid traverse
FMAX to the programmed setup clearance above the workpiece
surface and then moves the tool to the bore hole circumference on
a rounded arc (if enough space is available).
2 The tool mills in a helix from the current position to the first
plunging depth at the programmed feed rate F.
3 When the drilling depth is reached, the TNC once again traverses
a full circle to remove the material remaining after the initial
plunge.
4 The TNC then positions the tool at the center of the hole again.
5 Finally the TNC returns to the setup clearance at FMAX. If
programmed, the tool moves to the 2nd setup clearance at FMAX.