Overview: Types Of Paths For Contour Approach And Departure - HEIDENHAIN TNC 640 User Manual

7
Example
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.
286
Programming Contours | Approaching and departing a contour
Function
Straight line with tangential connec-
tion
Straight line perpendicular to a
contour point
Circular arc with tangential connec-
tion
Circular arc with tangential connec-
tion to the contour. Approach and
departure to an auxiliary point outside
the contour on a tangentially connect-
ing 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 640 | ISO Programming User's Manual | 10/2017