HEIDENHAIN TNC 620 (34056x-04) - Manual (Page 178)

Programming: Programming contours
6.3 Approaching and departing a contour
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TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
6.3 Approaching and departing a contour
Overview: Types of paths for contour approach and
departure
The functions for contour approach APPR and departure DEP are
activated with the APPR/DEP key. You can then select the desired
path function with the corresponding soft key:
Function Approach Departure
Straight line with tangential
connection
Straight line perpendicular to a
contour point
Circular arc with tangential
connection
Circular arc with tangential
connection to the contour. Approach
and departure to an auxiliary point
outside the contour on a tangentially
connecting line
Approaching and departing a helix
The tool approaches and departs a helix on its extension by moving
in a circular arc that connects tangentially to the contour. You
program helical approach and departure with the APPR CT and DEP
CT functions.