Bore Milling - HEIDENHAIN TNC 320 User Manual

Cycle programming

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3.9 BORE MILLING (Cycle 208,

DIN/ISO: G208)

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

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

HEIDENHAIN TNC 320

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