HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 408)

Drilling, boring and thread cycles
16.7 BACK BORING (Cycle 204)
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
Danger of collision!
Check the position of the tool tip when you program
a spindle orientation to the angle that you enter in
Q336 (for example, in the Positioning with Manual
Data Input mode of operation). Set the angle so that
the tool tip is parallel to a coordinate axis. Select a
disengaging direction in which the tool moves away
from the edge of the hole.