HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 83)

HEIDENHAIN TNC 640 83
3.9 BORE MILLING (Cy
c
le 208)
3.9 BORE MILLING (Cycle 208)
Cycle run
1 The TNC positions the tool in the spindle axis at rapid traverse FMAX
to the programmed set-up 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 set-up clearance at FMAX. If
programmed, the tool moves to the 2nd set-up clearance at FMAX.