HEIDENHAIN TNC 620 User Manual page 244

6
Programming contours
6.3 Approaching and departing a contour
Example NC blocks
N50 G00 G40 G90 X-30 Y+50*
N60 G01 G41 X+0 Y+50 F350*
N70 G26 R5*
. . .
PROGRAM CONTOUR BLOCKS
. . .
N210 G27 R5*
N220 G00 G40 X-30 Y+50*
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 following
path forms with the corresponding soft keys:
Approach Departure
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.
244
Function
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
Starting point
First contour point
Tangential approach with radius R = 5 mm
Last contour point
Tangential departure with radius R = 5 mm
End point
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016